Retaining walls: poured concrete and block walls in Connecticut
Free estimate, and a straight answer on whether your wall needs an engineer.
- Drainage stone and pipe behind every wall
- Poured walls on footings below frost
- Engineered design for walls over 4 feet
How we build a retaining wall
Retaining walls fail from water more often than from soil. Rain and snowmelt soak the ground behind the wall, the water has nowhere to go, and the pressure builds until the wall leans, bulges or cracks. In Connecticut that water also freezes.
So every wall we build has drainage built in: clean stone behind it and a perforated pipe at the base carrying water out. Then we size the wall to the job: segmental block for most garden and terrace walls, poured concrete where you need strength or a clean face, and an engineer's design when the wall is tall enough that the code requires one.
- Design
- Height, soil, slope and what sits above the wall; engineered over 4 ft
- Footing
- Poured walls: footing below the 42-in. frost line. Block walls: compacted gravel leveling pad
- Drainage
- 12 in. of clean stone behind the wall, filter fabric against the soil
- Pipe
- Perforated drain at the base, run to daylight or a drywell
- Reinforcement
- Rebar in poured walls; geogrid layers in taller block walls
- Batter
- Block walls lean back into the slope as designed
- Backfill
- Compacted in lifts, not dumped
- Cap
- Block caps bonded down, or a finished concrete top
- A
- Poured, reinforced wall (or segmental block)
- B
- Footing below the 42 in. frost line for poured walls
- C
- 12 in. of clean drainage stone
- D
- Filter fabric against the soil
- E
- Perforated pipe to daylight
- F
- Over 4 ft, footing bottom to top, needs an engineered design
How the job goes
Site visit
Height, length, soil, drainage and access. We tell you if an engineer is needed, and why.
Design and permit
Engineered drawings for walls over 4 ft or carrying a driveway, building or slope above.
Excavation
Cut back far enough for the base, drainage stone and any geogrid.
Footing or base
Poured footing below frost, or a compacted leveling pad for block.
Build and drain
Wall built or poured, pipe and stone placed as it rises, backfill compacted in lifts.
Cap and grade
Caps set, and the grade finished so surface water runs away from the wall.
Planning prices
| Work | Planning range | What drives it |
|---|---|---|
| Segmental concrete block wall | $40–$80 / face sq ft | Includes base, drainage stone and pipe |
| Poured concrete retaining wall | $60–$120 / face sq ft | Footing, rebar, forms and drainage |
| Garden or terrace walls under 3 ft | $3,000–$9,000 | Typical backyard runs |
| Engineering for walls over 4 ft | Engineer's fee | Required by code above 4 ft |
| Rebuild a leaning or failed wall | After a site visit | Demo and drainage are most of the cost |
Planning ranges for Connecticut in 2026, not quotes. Ledge, tight access, long pump or wheelbarrow runs and very small pours push a job up. Your price comes in writing after we've seen the site.
Wall types and jobs
- Segmental block walls
- Interlocking concrete block, flexible and freeze-tolerant. The go-to for terraces and garden walls.
- Poured concrete walls
- Reinforced and formed in place. Strong, thin and clean, with optional form-liner textures.
- Terraced walls
- Two shorter walls instead of one tall one, often avoiding engineering and leaving room for plants.
- Steps through walls
- Concrete or block steps built into the wall. See concrete steps.
- Wall replacement
- Leaning timber, failed block or old dry-laid walls taken down and rebuilt with drainage.
- Driveway and parking walls
- Walls that carry vehicle loads, designed for the extra pressure.
Retaining walls and Connecticut's building code
The 4-foot line. Under the state building code, a wall over 4 feet tall, measured from the bottom of the footing to the top of the wall, or one holding up a driveway, building or slope above it, needs a permit and generally an engineered design. Shorter walls usually don't need a permit, but they still need to be built right.
Frost. Poured walls go on footings below the 42-inch frost line. Segmental block walls are built to flex a little and sit on a compacted gravel pad instead, which is part of why they do well here.
Wetlands. Every Connecticut town has an inland wetlands commission, and work near wetlands, streams or ponds often needs its approval before a shovel goes in.
Stone walls. Connecticut is full of old dry-laid stone walls. They're boundary walls, not retaining walls, and most shouldn't be asked to hold back a new patio or driveway.
Questions we hear about retaining walls
Do I need a permit for a retaining wall in Connecticut?
Walls over 4 feet, measured from the bottom of the footing to the top, or walls holding up a driveway, slope or structure, need a permit and generally an engineered design. Shorter walls usually don't, though zoning setbacks and wetlands rules can still apply.
Why is my retaining wall leaning?
Almost always water. Without drainage stone and a pipe behind the wall, saturated soil and ice push it over time. Undersized walls and poor bases are the other usual suspects.
Block or poured concrete?
Block walls are flexible, easy to curve and step, and tolerate frost movement. Poured walls are stronger for their thickness, better in tight spaces and under heavy loads, and give a clean look. The site usually decides.
Can you fix a leaning wall without rebuilding it?
Rarely for long. A leaning wall has usually lost its drainage or its base. Short sections can sometimes be reset; most need to come down and be rebuilt with drainage.
How long do retaining walls last?
Decades, if water can get out from behind them. The drainage is what we're really building.
Can a retaining wall go on the property line?
Often, but check zoning setbacks and talk to your neighbor first. A survey avoids most arguments.
Retaining walls by town
We build retaining walls in 67 Connecticut towns. Pick yours for local conditions, permit notes and nearby towns.
Every dot is a town we serve.
Free retaining walls estimates
Call or send the estimate ticket. We set a time to see the site and put the price in writing.