Retaining wall Cost Calculator
A retaining wall costs £150–£400 per square metre of face: railway sleepers at £100–£250, rendered concrete block at £200–£400, gabion baskets between. The number that matters more than any price: past about a metre of retained height, you…
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3 steps, using the figures from our cost guide.
How this calculator works
Every figure in this calculator is the one published in the cost table on our retaining wall guide. Pick the option that matches your job and the calculator returns that published range, adjusted for your region - it does not model anything the guide does not already say.
That is deliberate. A calculator whose rates drift from the page it sits under is worse than no calculator, because two numbers on the same site disagree.
What it cannot know: access, the condition of what is already there, and anything structural. Those are what separate three real quotes from each other.
Published retaining wall costs (2026)
| Option | Typical 2026 cost | Notes |
|---|---|---|
| Timber sleeper | £100–£250 | |
| Gabion baskets | £150–£300 | |
| Concrete block (rendered) | £200–£400 | |
| Natural stone faced | £250–£450 | |
| Brick (matching house) | £250–£450 | |
| Engineer's design (over ~1m) | £400–£1,200 |
These are the figures from our retaining wall cost guide.
How to read your retaining wall quotes
The calculator gives you a budget range; a written quote tells you whether the builder has priced the wall that will actually stay up. When three quotes come back, the cheapest is often the one that has left something out, so read past the headline figure. Check that each one names the drainage - gravel backfill, a perforated land drain behind the wall and weep holes through the face. A quote that skips drainage is pricing a wall that leans within a few winters, and the retaining wall cost guide shows why.
Then look at the foundation. Sleepers and gabions sit on a compacted stone base, while block, brick and stone walls need a concrete footing sized to the retained height. Where two quotes are hundreds of pounds apart, the footing and the muck-away - getting spoil off site - usually explain most of the gap rather than the facing you can see. If the wall runs along a boundary, ask whether the Party Wall Act applies before anyone starts digging.
One last check: anything above about a metre of retained height should carry a structural engineer’s design, and the quote should say so and price it in. It’s a small line against the cost of rebuilding a wall that has failed. For the wider picture on garden structures, our garden wall cost guide and the landscaping hub are good next steps.
Retaining wall calculator — FAQs
£150–£400 per square metre of face for most builds: sleepers £100–£250, gabions £150–£300, engineered rendered block £200–£400 - foundations and drainage included.
Above roughly a metre of retained height, or any height with a driveway, structure or neighbour's land above it - yes. The design fee is £400–£1,200 and it is the cheapest part of a wall that stays up.
Water, almost always: saturated soil behind an undrained wall doubles the load. Gravel backfill, a land drain and weep holes are the fix - designed in, not added later.
Often not, but the usual limits apply: over 1m beside a highway or 2m elsewhere needs consent, and party-boundary walls bring the Party Wall Act into play. Check before digging.
Timber sleepers at £100–£250 per square metre are the cheapest option that still does the job, with gabion baskets at £150–£300 close behind. Both suit lower walls; once you pass about a metre of retained height the saving fades, because any material then needs an engineered footing and proper drainage.
A well-drained masonry or concrete-block wall lasts 40–60 years or more, while treated timber sleepers typically give 15–25 years before the boards need replacing. Lifespan comes down to drainage far more than the facing: a wall that sheds water behind it outlasts a prettier one that traps it.
Related cost guides
- Retaining wall cost guide — The full price guide
- All landscaping services — Browse the hub
- All BestBuilders services — Every trade we cover
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