Retaining Wall Renovation Cost in Ontario in 2026 | Price Calculator
The cost of retaining wall renovation in Ontario ranges from $30 to $75 per square foot installed in 2026 and is affected by wall height, material choice, old wall removal, drainage requirements, and site accessibility. A typical 3-foot-high, 30-foot-long renovation costs $4,000 to $9,500. Larger projects like a 4-foot-high, 50-foot-long renovation run $9,000 to $18,000.
Renovation projects often cost more than new installations because of demolition and disposal work. Removing an old failing wall adds $8 to $25 per linear foot to the project. Poor drainage behind the old wall usually means extra excavation and drainage system upgrades, pushing costs up another $1,200 to $4,000.
Most Ontario homeowners pay $6,000 to $16,000 for a complete retaining wall renovation including removal of the old wall and installation of a new one.
Which Factors Affect Retaining Wall Renovation Cost?
Wall Height
Height drives cost more than any other factor. A 2-foot wall costs $45 to $110 per linear foot. A 4-foot wall jumps to $160 to $320 per linear foot. A 6-foot wall can reach $350 to $500+ per linear foot.
Walls over 1 metre (3.3 feet) require engineering drawings and building permits under the Ontario Building Code. Engineering alone costs $1,500 to $3,500. Building permits add another $200 to $600 depending on your municipality.
Wall Length
Longer walls cost more overall but often less per foot. A 20-foot wall has higher per-foot costs than a 60-foot wall because contractors spread equipment and setup costs across more footage.
Old Wall Removal and Disposal
This is where renovations get expensive. Removing a failing concrete block wall costs $10 to $18 per linear foot. Poured concrete demolition runs $12 to $25 per linear foot. Disposal adds $200 to $800 per truckload depending on the amount of material.
Stone walls are easier to remove. Natural stone or boulder walls cost $8 to $15 per linear foot for removal if heavy equipment can access the site.
Buried timber can be the worst. Rotted landscape timbers often require extra digging to remove anchor pins and deadmen. Expect $8 to $20 per linear foot for timber wall removal.
Condition of the Existing Wall
A leaning or bulging wall signals drainage problems. Fixing the underlying issue costs more than just swapping materials. Poor drainage means excavating deeper, installing proper weeping tile, and adding filter fabric and clear stone. This adds $10 to $18 per linear foot.
Walls that failed due to frost heave need deeper footings. Ontario’s freeze-thaw cycles demand foundations below the frost line—about 4 feet deep in most of the province. Deeper excavation adds $500 to $2,000+ to the project.
Limestone is most affordable natural option in Ontario
Poured Concrete
$8 to $15/sq ft
$35 to $65/sq ft
50–75+ years
Tall walls requiring maximum strength
Armour Stone (Large Natural Boulders)
$45 to $95/ton (stones 1–3 tons each)
$30 to $60/sq ft
50–100+ years
Requires heavy equipment access
Site Accessibility
Renovations often face worse access than new builds. The old wall may block equipment access. Narrow side yards, no side access, or steep slopes increase labour costs by 15% to 35%.
A mini excavator needs a 3-foot-wide path minimum. Without equipment access, crews move debris and materials by hand. This can double labour time on removal.
Drainage System Upgrades
Most failing walls have poor drainage. Water pressure builds up behind the wall and eventually pushes it over. A proper drainage system includes:
Perforated weeping tile behind the wall: $8 to $15 per linear foot
Clear stone (3/4″ crushed) for drainage: $5 to $10 per linear foot
Filter fabric to prevent soil clogging: $2 to $4 per linear foot
Total drainage upgrade: $15 to $30 per linear foot for a basic system. Properties with serious water problems may need additional catch basins ($400 to $900 each) or French drains ($30 to $60 per linear foot).
Soil Conditions Behind the Wall
Renovations often reveal problem soil. Clay soil expands when wet and contracts when dry, putting constant pressure on walls. Clay replacement or amendment adds $800 to $2,500 to the project.
Rocky soil slows excavation. Expect $600 to $1,800 in extra excavation costs if bedrock or heavy rock needs breaking.
Design Complexity
Straight wall replacements are simplest. Curves, corners, steps, or tiered sections add labour. Complex designs cost $8 to $18 per square foot more than straight walls.
Which Stone Brands and Types Are Available?
Concrete Block Systems
Popular lines: Pisa 2 ($7–$11/sq ft material), Rivercrest ($10–$15/sq ft), U-Cara ($9–$13/sq ft)
Wide colour selection
Available at over 200 Ontario dealers
30–40 year expected lifespan
Popular lines: Borealis ($11–$16/sq ft material), Prescott ($8–$12/sq ft), Alba ($9–$14/sq ft)
Modern textured finishes
Premium pricing tier
Excellent colour retention
Popular lines: Melville ($7–$10/sq ft material), Mondrian ($8–$12/sq ft)
Mid-range pricing
Good availability across Ontario
Solid performance in freeze-thaw conditions
Popular lines: Highland Stone ($8–$13/sq ft material), Diamond Pro ($7–$11/sq ft)
Wide product range
Competitive pricing
Available through multiple suppliers
Classic AB blocks ($6–$9/sq ft material)
Simple installation system
No pins or lips—uses weight and setback
Popular for DIY-friendly projects
Ontario-based manufacturer
Standard retaining wall blocks ($6–$10/sq ft material)
Good local availability
Competitive pricing on large orders
Natural Stone Options
Ontario quarried
Colour: Warm grey to buff tones
Cost: $15–$25 per square foot (material only)
Most affordable natural stone option
Good workability for cutting and fitting
Imported (Canadian Shield regions)
Colour: Grey, pink, black
Cost: $20–$30 per square foot (material only)
Extremely durable
Heavier and harder to work with
Rounded natural stones
Mixed colours and sizes
Cost: $18–$28 per square foot (material only)
Unique rustic appearance
Each piece is different
Large boulders (200 lbs to 3+ tons each)
Natural weathered edges
Cost: $45–$95 per ton
Popular in cottage country
Requires excavator for placement
Coping and Cap Options
A finished cap protects the top of the wall and adds a polished look.
Matching Block Caps: $4 to $9 per linear foot, sits flat on top course, matches wall colour
Premium Concrete Caps: $10 to $18 per linear foot, textured or smooth finishes, wider profile for seating walls
Natural Stone Caps: Limestone: $12 to $22 per linear foot, Granite: $18 to $35 per linear foot, custom-cut pieces, high-end finish
Flat Cap Blocks: $8 to $14 per linear foot, designed for sitting, 12–14 inches wide
How Long Does Retaining Wall Renovation Take?
Project timelines depend on wall size, demolition needs, material choice, and permit requirements.
Small Renovation (Under 3 ft tall, under 25 ft long): Old wall removal: 1 day; New wall installation: 2–3 days; Total active work: 3–4 days
Medium Renovation (3–4 ft tall, 30–50 ft long): Old wall removal: 1–2 days; Excavation and drainage: 1–2 days; New wall installation: 3–5 days; Total active work: 5–9 days
Large Renovation (4–6 ft tall, 50+ ft long): Old wall removal: 2–3 days; Excavation and drainage upgrades: 2–4 days; New wall installation: 5–8 days; Total active work: 9–15 days
Complex Projects (Tiered walls, curves, steps, difficult access): Add 3–7 days to timelines above; Hand work takes 2–3 times longer than machine work
Permit and Engineering Timeline: Engineering drawings: 1–2 weeks; Municipal permit review: 1–4 weeks depending on municipality; Total permit timeline: 2–6 weeks
Poured concrete walls add curing time. Concrete needs 48–72 hours minimum before backfilling. Full cure takes 28 days but most residential walls can be backfilled after 3–5 days.
Weather delays are common in Ontario. Rain stops excavation and wall installation. Most contractors avoid renovation work November through March because of frost and frozen ground.
Which Special Cases Affect Renovation Costs?
Coping and Cap Upgrades
Adding a premium cap to a basic block wall is a popular renovation choice.
Flat caps for seating walls cost $10 to $20 per linear foot installed. A 40-foot wall adds $400 to $800 for seating caps.
Natural stone caps on concrete block walls create a high-end look for less than full natural stone construction. Limestone caps add $12 to $22 per linear foot. A 50-foot wall adds $600 to $1,100 for stone capping.
Wall Height Variations
Stepped walls that follow a slope require more cutting and fitting. Each step adds complexity. Stepped walls cost 15% to 30% more than level-top walls of the same average height.
Tiered walls (two or more walls with a terrace between them) often replace a single tall wall. Two 3-foot walls with a 4-foot terrace cost 25% to 50% more than one 6-foot wall. But tiered walls avoid the engineering and permit requirements for walls over 1 metre, potentially saving $2,000 to $4,000 in professional fees.
Armour Stone Renovations
Replacing timber or failing concrete with armour stone requires different equipment and skills. Armour stone installation needs an excavator with a grapple or lifting chain. Rental and operator cost $800 to $1,500 per day.
Stone costs vary by size:
Small armour stone (200–500 lbs each): $65–$85 per ton
Medium armour stone (500–1,200 lbs each): $55–$75 per ton
Large armour stone (1,200–3,000+ lbs each): $48–$65 per ton
A 50-foot armour stone wall 3 feet high needs roughly 15–20 tons of stone. Stone material alone costs $750 to $1,600. Installation adds another $2,500 to $4,500.
Integrating Steps into Renovated Walls
Adding steps during a wall renovation is common. Steps connect different yard levels and provide access.
Concrete Block Steps: $60 to $120 per linear foot of step width. A 4-foot-wide set of 3 steps: $720 to $1,440
Natural Stone Steps: $100 to $220 per linear foot of step width. A 4-foot-wide set of 3 steps: $1,200 to $2,640
Poured Concrete Steps: $70 to $150 per linear foot of step width. A 4-foot-wide set of 3 steps: $840 to $1,800
Lighting Integration
LED lighting during renovation is easier than retrofitting later. Under-cap LED strips cost $18 to $40 per linear foot installed including transformer and wiring. A 40-foot wall adds $720 to $1,600 for lighting.
Individual wall lights (recessed fixtures) cost $120 to $280 per fixture installed. Six fixtures add $720 to $1,680.
Curved Wall Renovations
Curves require more cutting and specialized installation. Tight radius curves need smaller blocks or custom cutting. Curved walls cost $8 to $18 more per linear foot than straight walls.
Most modular block systems handle gentle curves without cutting. Tight curves (under 8-foot radius) need extensive cutting and can add 25% to 40% to labour costs.
How Do Different Materials Compare?
Feature
Concrete Block
Natural Stone
Poured Concrete
Armour Stone
Installed Cost
$30–$55/sq ft
$40–$85/sq ft
$35–$65/sq ft
$30–$60/sq ft
Lifespan
30–50 years
50–100+ years
50–75 years
50–100+ years
Maintenance
Very low
Very low
Low
Almost none
Appearance
Uniform, modern
Natural, unique
Smooth, industrial
Rugged, natural
Installation Speed
Fast
Slow
Medium
Fast (with equipment)
Colour Options
Many
Natural variations
Can be stained
Natural grey/brown
Freeze-Thaw Performance
Excellent
Varies by stone
Excellent
Excellent
Equipment Needed
Minimal
Minimal
Formwork
Excavator required
Best For
Most renovations
High-end projects
Tall structural walls
Rural/cottage properties
How Do Stone Brands Compare by Quality and Price?
Brand
Price Tier
Quality Rating
Longevity
Maintenance
Price Range (Material)
Techo-Bloc
Premium
Excellent
35–50 years
Very low
$9–$16/sq ft
Unilock
Premium
Excellent
35–50 years
Very low
$7–$15/sq ft
Permacon
Mid-range
Very Good
30–45 years
Low
$7–$12/sq ft
Belgard
Mid-range
Very Good
30–45 years
Low
$7–$13/sq ft
Allan Block
Standard
Good
30–40 years
Low
$6–$9/sq ft
Oaks
Standard
Good
30–40 years
Low
$6–$10/sq ft
Limestone
Premium
Excellent
50–100+ years
Very low
$15–$25/sq ft
Granite
Premium
Excellent
50–100+ years
Very low
$20–$30/sq ft
Armour Stone
Mid-Premium
Excellent
50–100+ years
Almost none
$45–$95/ton
General Ontario Requirements for Retaining Wall Renovations
Construction Hours Allowed in Residential Areas
Ontario does not have one province-wide construction noise bylaw. Each municipality sets its own hours. Most follow a similar pattern:
Monday to Friday: 7:00 AM to 7:00 PM Saturday: 9:00 AM to 7:00 PM (some municipalities allow 7:00 AM starts) Sunday and Statutory Holidays: No construction noise permitted
Always check your specific municipality before scheduling work. Violating construction hours can result in work stoppages and fines.
Ontario Building Code Requirements for Retaining Walls
Under the Ontario Building Code, retaining walls over 1 metre (3.3 feet) in exposed height are designated structures when:
Adjacent to or accessible by the public
Near a building, driveway, or walkway
On or near a property line where collapse could affect neighbouring property
Designated structures require:
Engineered drawings prepared and stamped by a Professional Engineer (P.Eng.) licensed in Ontario
A building permit from your local municipality
Inspections at key stages (typically footing/base inspection and final inspection)
Engineering fees for retaining wall renovations: $1,500 to $3,500 Building permit fees: $200 to $600 depending on municipality
Retaining walls under 1 metre on private property that are not accessible to the public and not near structures generally do not require permits. But municipalities vary—some are stricter than others.
Conservation Authority Requirements
Properties near ravines, creeks, floodplains, or wetlands fall under conservation authority jurisdiction. You may need a conservation permit regardless of wall height.
Toronto and Region Conservation Authority (TRCA)
Conservation Halton
Credit Valley Conservation (CVC)
Central Lake Ontario Conservation Authority (CLOCA)
Lake Simcoe Region Conservation Authority (LSRCA)
Conservation permit review adds 4–8 weeks to project timelines and costs $500 to $1,500+.
Guard Requirements
The Ontario Building Code requires a guard (fence or railing) at the top of any retaining wall where there is a drop of more than 600 mm (about 2 feet) and the public has access. In Toronto specifically, a guard is required on any retaining wall with an exposed height exceeding 1 metre.
Guards must be at least 1,070 mm (42 inches) high for residential properties.
Permit required: Yes, for retaining walls over 1 metre in height that are accessible to the public or adjacent to buildings/driveways. Walls under 1 metre on private property with no public access generally do not need a permit.
Engineering required: Stamped drawings from a Professional Engineer for walls over 1 metre.
Guard required: Yes, for walls with exposed height over 1 metre.
Contact: 311 (or 416-392-2489 outside Toronto)
Website: toronto.ca
Permit required: Yes, for retaining walls over 1 metre in height, particularly those adjacent to public property, building entrances, or accessible areas. Engineering drawings required. Where retaining walls over 1 m are proposed as part of lot grading, a grading plan review is also required.
Contact: 311 (or 905-615-4311 outside city limits)
Website: mississauga.ca
Permit required: Yes, for retaining walls classified as designated structures under the Ontario Building Code (over 1 metre, near public areas or structures). Properties near conservation areas may also require a Conservation Halton permit.
Contact: 905-845-6601
Email: service@oakville.ca
Website: oakville.ca
Permit required: Yes, for retaining walls over 1 metre in height. Engineered drawings required. Conservation Halton permits may also apply for properties near regulated areas.
Contact: 905-335-7600
Website: burlington.ca
Permit required: Yes, for retaining walls over 1 metre. Engineering and grading plans typically required. Conservation Halton may require a separate permit for properties in regulated areas.
Contact: 905-878-7252
Website: milton.ca
Permit required: Yes, for retaining walls over 1 metre in height. Small retaining walls under 1 metre do not require a building permit.
Engineering required: Stamped drawings from a Professional Engineer for walls over 1 metre.
Contact: 905-832-2281
Website: vaughan.ca
Permit required: Yes, for retaining walls over 1 metre in height or those adjacent to public areas. Engineering drawings required.
Contact: 905-771-8800
Website: richmondhill.ca
Permit required: Yes, for retaining walls over 1 metre. Permit applications require engineered drawings.
Contact: 905-477-5530
Website: markham.ca
Permit required: Yes, for retaining walls over 1 metre in height or those classified as designated structures. Properties on regional roads may need to coordinate with Durham Region.
Contact: 905-619-2529 ext. 3652
Email: BuildingPermits@ajax.ca
Website: ajax.ca
Permit required: Yes, for retaining walls over 1 metre in height that are accessible to the public or adjacent to structures. Walls under 1 metre on private property with no public access do not require a permit.
Contact: 905-420-4660
Website: pickering.ca
Permit required: Yes, for retaining walls over 1 metre in height. Designated structure permit application with engineered drawings.
Contact: 905-430-4300
Website: whitby.ca
Permit required: Yes, for retaining walls over 1 metre. Engineering drawings and inspections required.
Contact: 905-436-3311
Website: oshawa.ca
Permit required: Yes, for retaining walls over 1 metre in height. Engineering required for designated structures.
Contact: 905-895-5193
Website: newmarket.ca
Permit required: Yes, for retaining walls over 1 metre. Contact the building department for application requirements.
Contact: 905-727-1375
Website: aurora.ca
Durham Region handles permits for regional roads. For local roads, contact your municipality directly (Ajax, Pickering, Whitby, Oshawa).
Regional Contact: 1-800-372-1102 or 905-668-7711
Website: durham.ca
York Region coordinates with local municipalities (Vaughan, Markham, Richmond Hill, Newmarket, Aurora). Building permits are issued by individual municipalities.
Regional Contact: 1-877-464-9675
Website: york.ca
Permit required: Yes, for retaining walls over 1 metre in height. Engineered drawings and a building permit application required. Conservation Halton permits may apply for properties near regulated areas.
Contact: 905-873-2601
Website: haltonhills.ca
Frequently Asked Questions
Removal costs depend on the material and wall size. Concrete block walls cost $10 to $18 per linear foot for removal. Poured concrete runs $12 to $25 per linear foot. Natural stone or timber walls cost $8 to $15 per linear foot. Disposal adds $200 to $800 per truckload. A typical 30-foot wall removal costs $500 to $1,200 including disposal.
Yes, if the wall exceeds 1 metre (3.3 feet) in exposed height and is adjacent to public areas, buildings, driveways, or property lines. You need engineered drawings from a licensed P.Eng. and a building permit from your municipality. Walls under 1 metre on private property with no public access generally do not require permits, but check with your local building department. Some municipalities are stricter than others.
Concrete block walls last 30–50 years. Natural stone walls last 50–100+ years. Poured concrete lasts 50–75 years. Armour stone lasts 50–100+ years. Timber walls only last 10–20 years even when treated. Ontario’s freeze-thaw cycles shorten the life of any wall with poor drainage. Proper drainage adds 10–20 years to expected lifespan.
Concrete block costs less and installs faster. It works for most residential renovations. Natural stone costs $10 to $30 more per square foot but lasts longer and looks more natural. Choose concrete block for standard residential walls where cost matters. Choose natural stone for high-visibility areas, heritage properties, or when you want a unique look that will outlast you.
Not recommended. Partial replacements rarely work long-term. The old section continues to deteriorate and puts stress on the new section. Drainage problems that caused the original failure affect the entire wall. Most contractors refuse partial wall renovations because of liability. Replace the entire wall to avoid future problems and ensure proper drainage throughout.
Author: Stephen Arnold
Content Writer, Former Construction Project Manager
The cost of retaining wall renovation in Ontario ranges from $30 to $75 per square foot installed in 2026 and is affected by wall height, material choice, old wall removal, drainage requirements, and site accessibility. A typical 3-foot-high, 30-foot-long renovation costs $4,000 to $9,500. Larger projects like a 4-foot-high, 50-foot-long renovation run $9,000 to $18,000.
Renovation projects often cost more than new installations because of demolition and disposal work. Removing an old failing wall adds $8 to $25 per linear foot to the project. Poor drainage behind the old wall usually means extra excavation and drainage system upgrades, pushing costs up another $1,200 to $4,000.
Most Ontario homeowners pay $6,000 to $16,000 for a complete retaining wall renovation including removal of the old wall and installation of a new one.
Which Factors Affect Retaining Wall Renovation Cost?
Wall Height
Height drives cost more than any other factor. A 2-foot wall costs $45 to $110 per linear foot. A 4-foot wall jumps to $160 to $320 per linear foot. A 6-foot wall can reach $350 to $500+ per linear foot.
Walls over 1 metre (3.3 feet) require engineering drawings and building permits under the Ontario Building Code. Engineering alone costs $1,500 to $3,500. Building permits add another $200 to $600 depending on your municipality.
Wall Length
Longer walls cost more overall but often less per foot. A 20-foot wall has higher per-foot costs than a 60-foot wall because contractors spread equipment and setup costs across more footage.
Old Wall Removal and Disposal
This is where renovations get expensive. Removing a failing concrete block wall costs $10 to $18 per linear foot. Poured concrete demolition runs $12 to $25 per linear foot. Disposal adds $200 to $800 per truckload depending on the amount of material.
Stone walls are easier to remove. Natural stone or boulder walls cost $8 to $15 per linear foot for removal if heavy equipment can access the site.
Buried timber can be the worst. Rotted landscape timbers often require extra digging to remove anchor pins and deadmen. Expect $8 to $20 per linear foot for timber wall removal.
Condition of the Existing Wall
A leaning or bulging wall signals drainage problems. Fixing the underlying issue costs more than just swapping materials. Poor drainage means excavating deeper, installing proper weeping tile, and adding filter fabric and clear stone. This adds $10 to $18 per linear foot.
Walls that failed due to frost heave need deeper footings. Ontario’s freeze-thaw cycles demand foundations below the frost line—about 4 feet deep in most of the province. Deeper excavation adds $500 to $2,000+ to the project.
Material Choice for the New Wall
Site Accessibility
Renovations often face worse access than new builds. The old wall may block equipment access. Narrow side yards, no side access, or steep slopes increase labour costs by 15% to 35%.
A mini excavator needs a 3-foot-wide path minimum. Without equipment access, crews move debris and materials by hand. This can double labour time on removal.
Drainage System Upgrades
Most failing walls have poor drainage. Water pressure builds up behind the wall and eventually pushes it over. A proper drainage system includes:
Total drainage upgrade: $15 to $30 per linear foot for a basic system. Properties with serious water problems may need additional catch basins ($400 to $900 each) or French drains ($30 to $60 per linear foot).
Soil Conditions Behind the Wall
Renovations often reveal problem soil. Clay soil expands when wet and contracts when dry, putting constant pressure on walls. Clay replacement or amendment adds $800 to $2,500 to the project.
Rocky soil slows excavation. Expect $600 to $1,800 in extra excavation costs if bedrock or heavy rock needs breaking.
Design Complexity
Straight wall replacements are simplest. Curves, corners, steps, or tiered sections add labour. Complex designs cost $8 to $18 per square foot more than straight walls.
Which Stone Brands and Types Are Available?
Concrete Block Systems
Natural Stone Options
Coping and Cap Options
A finished cap protects the top of the wall and adds a polished look.
How Long Does Retaining Wall Renovation Take?
Project timelines depend on wall size, demolition needs, material choice, and permit requirements.
Weather delays are common in Ontario. Rain stops excavation and wall installation. Most contractors avoid renovation work November through March because of frost and frozen ground.
Which Special Cases Affect Renovation Costs?
Coping and Cap Upgrades
Adding a premium cap to a basic block wall is a popular renovation choice.
Flat caps for seating walls cost $10 to $20 per linear foot installed. A 40-foot wall adds $400 to $800 for seating caps.
Natural stone caps on concrete block walls create a high-end look for less than full natural stone construction. Limestone caps add $12 to $22 per linear foot. A 50-foot wall adds $600 to $1,100 for stone capping.
Wall Height Variations
Stepped walls that follow a slope require more cutting and fitting. Each step adds complexity. Stepped walls cost 15% to 30% more than level-top walls of the same average height.
Tiered walls (two or more walls with a terrace between them) often replace a single tall wall. Two 3-foot walls with a 4-foot terrace cost 25% to 50% more than one 6-foot wall. But tiered walls avoid the engineering and permit requirements for walls over 1 metre, potentially saving $2,000 to $4,000 in professional fees.
Armour Stone Renovations
Replacing timber or failing concrete with armour stone requires different equipment and skills. Armour stone installation needs an excavator with a grapple or lifting chain. Rental and operator cost $800 to $1,500 per day.
Stone costs vary by size:
A 50-foot armour stone wall 3 feet high needs roughly 15–20 tons of stone. Stone material alone costs $750 to $1,600. Installation adds another $2,500 to $4,500.
Integrating Steps into Renovated Walls
Adding steps during a wall renovation is common. Steps connect different yard levels and provide access.
Lighting Integration
LED lighting during renovation is easier than retrofitting later. Under-cap LED strips cost $18 to $40 per linear foot installed including transformer and wiring. A 40-foot wall adds $720 to $1,600 for lighting.
Individual wall lights (recessed fixtures) cost $120 to $280 per fixture installed. Six fixtures add $720 to $1,680.
Curved Wall Renovations
Curves require more cutting and specialized installation. Tight radius curves need smaller blocks or custom cutting. Curved walls cost $8 to $18 more per linear foot than straight walls.
Most modular block systems handle gentle curves without cutting. Tight curves (under 8-foot radius) need extensive cutting and can add 25% to 40% to labour costs.
How Do Different Materials Compare?
How Do Stone Brands Compare by Quality and Price?
General Ontario Requirements for Retaining Wall Renovations
Construction Hours Allowed in Residential Areas
Ontario does not have one province-wide construction noise bylaw. Each municipality sets its own hours. Most follow a similar pattern:
Monday to Friday: 7:00 AM to 7:00 PM
Saturday: 9:00 AM to 7:00 PM (some municipalities allow 7:00 AM starts)
Sunday and Statutory Holidays: No construction noise permitted
Always check your specific municipality before scheduling work. Violating construction hours can result in work stoppages and fines.
Ontario Building Code Requirements for Retaining Walls
Under the Ontario Building Code, retaining walls over 1 metre (3.3 feet) in exposed height are designated structures when:
Designated structures require:
Engineering fees for retaining wall renovations: $1,500 to $3,500
Building permit fees: $200 to $600 depending on municipality
Retaining walls under 1 metre on private property that are not accessible to the public and not near structures generally do not require permits. But municipalities vary—some are stricter than others.
Conservation Authority Requirements
Properties near ravines, creeks, floodplains, or wetlands fall under conservation authority jurisdiction. You may need a conservation permit regardless of wall height.
Conservation permit review adds 4–8 weeks to project timelines and costs $500 to $1,500+.
Guard Requirements
The Ontario Building Code requires a guard (fence or railing) at the top of any retaining wall where there is a drop of more than 600 mm (about 2 feet) and the public has access. In Toronto specifically, a guard is required on any retaining wall with an exposed height exceeding 1 metre.
Guards must be at least 1,070 mm (42 inches) high for residential properties.
Permit required: Yes, for retaining walls over 1 metre in height that are accessible to the public or adjacent to buildings/driveways. Walls under 1 metre on private property with no public access generally do not need a permit.
Engineering required: Stamped drawings from a Professional Engineer for walls over 1 metre.
Guard required: Yes, for walls with exposed height over 1 metre.
Contact: 311 (or 416-392-2489 outside Toronto)
Website: toronto.ca
Permit required: Yes, for retaining walls over 1 metre in height, particularly those adjacent to public property, building entrances, or accessible areas. Engineering drawings required. Where retaining walls over 1 m are proposed as part of lot grading, a grading plan review is also required.
Contact: 311 (or 905-615-4311 outside city limits)
Website: mississauga.ca
Permit required: Yes, for retaining walls classified as designated structures under the Ontario Building Code (over 1 metre, near public areas or structures). Properties near conservation areas may also require a Conservation Halton permit.
Contact: 905-845-6601
Email: service@oakville.ca
Website: oakville.ca
Permit required: Yes, for retaining walls over 1 metre in height. Engineered drawings required. Conservation Halton permits may also apply for properties near regulated areas.
Contact: 905-335-7600
Website: burlington.ca
Permit required: Yes, for retaining walls over 1 metre. Engineering and grading plans typically required. Conservation Halton may require a separate permit for properties in regulated areas.
Contact: 905-878-7252
Website: milton.ca
Permit required: Yes, for retaining walls over 1 metre in height. Small retaining walls under 1 metre do not require a building permit.
Engineering required: Stamped drawings from a Professional Engineer for walls over 1 metre.
Contact: 905-832-2281
Website: vaughan.ca
Permit required: Yes, for retaining walls over 1 metre in height or those adjacent to public areas. Engineering drawings required.
Contact: 905-771-8800
Website: richmondhill.ca
Permit required: Yes, for retaining walls over 1 metre. Permit applications require engineered drawings.
Contact: 905-477-5530
Website: markham.ca
Permit required: Yes, for retaining walls over 1 metre in height or those classified as designated structures. Properties on regional roads may need to coordinate with Durham Region.
Contact: 905-619-2529 ext. 3652
Email: BuildingPermits@ajax.ca
Website: ajax.ca
Permit required: Yes, for retaining walls over 1 metre in height that are accessible to the public or adjacent to structures. Walls under 1 metre on private property with no public access do not require a permit.
Contact: 905-420-4660
Website: pickering.ca
Permit required: Yes, for retaining walls over 1 metre in height. Designated structure permit application with engineered drawings.
Contact: 905-430-4300
Website: whitby.ca
Permit required: Yes, for retaining walls over 1 metre. Engineering drawings and inspections required.
Contact: 905-436-3311
Website: oshawa.ca
Permit required: Yes, for retaining walls over 1 metre in height. Engineering required for designated structures.
Contact: 905-895-5193
Website: newmarket.ca
Permit required: Yes, for retaining walls over 1 metre. Contact the building department for application requirements.
Contact: 905-727-1375
Website: aurora.ca
Durham Region handles permits for regional roads. For local roads, contact your municipality directly (Ajax, Pickering, Whitby, Oshawa).
Regional Contact: 1-800-372-1102 or 905-668-7711
Website: durham.ca
York Region coordinates with local municipalities (Vaughan, Markham, Richmond Hill, Newmarket, Aurora). Building permits are issued by individual municipalities.
Regional Contact: 1-877-464-9675
Website: york.ca
Permit required: Yes, for retaining walls over 1 metre in height. Engineered drawings and a building permit application required. Conservation Halton permits may apply for properties near regulated areas.
Contact: 905-873-2601
Website: haltonhills.ca
Frequently Asked Questions