Retaining Wall Construction
Block and boulder retaining walls that hold back soil and look sharp.
Under the New Jersey Uniform Construction Code a construction permit is required for a retaining wall four feet or more in total height, and also for a wall under four feet if it supports a surcharge such as a driveway, a structure or a slope above it. Total height is measured from the bottom of the footing to the top of the wall, not from the ground you are standing on, so a wall showing three feet of face is often over four feet once the footing is counted. The excavation, stockpiling and regrading behind the wall is disturbance in its own right, and past 5,000 square feet the job needs a soil erosion and sediment control plan certified by the county Soil Conservation District.
Want that answered for your property instead of in general? Call 862-268-2510 or get a free on-site estimate. We will tell you straight, including when the answer is that you do not need us.
A good retaining wall solves a slope problem and lasts for decades. We build block and natural boulder walls with the proper base, drainage, and backfill so they hold ground, handle water, and stay put through the freeze and thaw.
How we do it
A wall is a structure, so we build it like one. The footing trench gets dug to the right depth and filled with compacted stone, the first course gets set dead level, and every course above it gets backfilled with clean stone as it rises, never all at once at the end.
Drainage is built in from the start, with fabric and a way for water to escape, because trapped water is what kills walls. Block or boulder, the finished wall stands plumb, sheds water, and stays that way.
What's included
- Segmental block retaining walls
- Natural stone and boulder walls
- Proper footing and base prep
- Drainage behind the wall
- Slope stabilization
- Terracing and grade changes
Retaining Walls: what people ask us
Block or boulder walls, which is better?
Block gives a clean engineered look and precise heights; boulder walls look natural and use what the land gives. Both last for decades when the footing and drainage behind them are done right.
Do retaining walls really need drainage?
Absolutely. Water building up behind a wall is what pushes walls over. Every wall we build gets stone backfill and a way for water to escape, which is why our walls stay straight.
How tall can you build without an engineer?
In most NJ towns, walls over about four feet need engineering. We build to code either way and will tell you honestly when your project needs an engineer involved.
What New Jersey actually requires
Most of the surprises on this kind of job are regulatory, not mechanical. Here is what binds the work in our counties, with the state sources so you can read them yourself.
| What | What it means for your project |
|---|---|
| When a wall needs a construction permit | Under the Uniform Construction Code a construction permit is required for a retaining wall with a total height of four feet or more, and also for a wall under four feet if it has a negative impact on a foundation. Walls being dedicated to the municipality, or reviewed by a county engineer or NJDOT, follow their own path. |
| How that height is measured, which is where people go wrong | From the BOTTOM OF THE FOOTING to the top of the wall, not from the ground you are standing on. A wall showing three feet of face can easily be over four feet once the footing below grade is counted, so plenty of walls people assume are permit-free are not. Worth checking before the block is on site. |
| The disturbance behind the wall still counts | Building a wall usually means excavating, stockpiling and regrading, and once that passes 5,000 square feet the job needs a soil erosion and sediment control plan certified by your county Soil Conservation District. The wall permit and the erosion plan are separate approvals from separate offices. |
Sources: N.J.A.C. 5:23, New Jersey Uniform Construction Code (NJ Department of Community Affairs) · N.J.S.A. 4:24-39 et seq., the NJ Soil Erosion and Sediment Control Act (statute text). This is general information, not a ruling on your property. Your county Soil Conservation District and your town have the final say for your address. Every New Jersey threshold in one table →
What it costs
How much does a retaining wall cost in NJ?
$3,000 to over $100,000
What moves it:
- Size, which means height and length together. Height drives engineering far faster than length does.
- Materials, from segmental block through natural stone to poured concrete.
- Whether the wall needs to be engineered, which depends on its height and on what it is holding back.
- What sits above it. A wall supporting a driveway, a structure or a slope is carrying a surcharge and is a different design problem.
A structural wall is not a stack of block. It needs geogrid tied back into the retained soil, properly compacted backfill in lifts, and drainage behind the face so water is not pushing on the wall. Walls that fail almost always failed on drainage or backfill, not on the block. That is where the money goes, and it is invisible once the job is finished.
Our ranges in northern New Jersey as of August 2026, not a quote. Every range on the site is on what this work costs.
Retaining Walls: the questions behind the job
Retaining Walls: in our customers’ words
“From start to finish, JWSR exceeded all my expectations. They completed the work on time and within budget, and left everything spotless. Highly recommend for any excavation, fiber installation, or heavy-duty projects! 10/10 service!”
“James and crew completed a retaining wall and driveway regrading project for a customer of mine. Customer was very satisfied. Highly recommended!”
Retaining Walls across northern & central NJ
We provide retaining walls across all 7 counties we serve. A few of the towns we cover:
Ready to get started?
Free on-site estimates. 24/7 emergency service. Call and talk to a real person.
Call 862-268-2510