Published national guides put the average cost of underpinning at around £13,500, with most jobs between £6,000 and £21,000 (MyJobQuote), while the RICS consumer guide on subsidence says underpinning a typical house can cost £10,000 to £75,000 (figures checked November 2026). The real cost of underpinning in Liverpool depends on the method, how deep suitable ground is, how much wall is involved, access, and the investigation, permissions and making good around the work. Every scheme we carry out is priced only after a chartered structural engineer has designed it.
What do published guides say underpinning costs?
There is no official price list for underpinning, but several national organisations publish ranges. They are useful for a sense of scale, not as a quote for any particular house in Merseyside.
| Source | What it says | Notes |
|---|---|---|
| MyJobQuote underpinning cost guide | “The average cost of underpinning is £13,500 in the UK”, with a typical range of £6,000 to £21,000 | Also says most jobs take about three to five weeks |
| RICS consumer guide on subsidence | Underpinning can cost £10,000 to £75,000 for a typical house | RICS also says fewer than 5% of affected homes need underpinning |
| Association of British Insurers, “What if subsidence happens” | Most buildings insurance policies have a subsidence excess of around £1,000 | Relevant where the repair is part of an insurance claim |
All figures checked November 2026. These are national published figures, not our prices. The spread between the lowest and highest numbers is huge because underpinning a single bay window and underpinning the whole of a detached house on deep soft ground are completely different projects.
We price each scheme only after the structural engineer’s design is complete. If the repair is funded by an insurance claim, the insurer decides the scope of the work and the method, not the contractor.
Why we do not publish our own price list
A figure for “underpinning” on a website would mislead more people than it helped. The two things that drive the price, how deep the engineer needs to go and how much of the house needs support, are not known until the ground has been investigated. A trial pit can show a shallow Victorian footing sitting on soft made ground, or a reasonable footing on clay full of roots, and those lead to very different designs. Rather than guess, we explain the factors here and price the engineer’s scheme properly. This is how we approach all of our underpinning work in Liverpool.
What affects the cost of underpinning?
| Cost factor | Why it matters | What tends to increase cost |
|---|---|---|
| Method | Each method uses different labour, plant and materials. | Piled schemes needing a rig and reinforced beams; deep mass concrete bays. |
| Depth to suitable ground | The engineer sets the depth needed to reach ground unaffected by movement. | Deep clay affected by roots, soft or made ground, backfilled pits. |
| Length of wall | More wall means more bays, piles or beam length. | Whole-house schemes rather than one corner or bay. |
| Access | Excavation, spoil removal and concrete delivery all need a route. | Terraces with no rear access, spoil carried through the house, tight gardens. |
| Inside or outside | Internal walls and floors may also need support. | Lifting floors, working inside occupied rooms, cellars. |
| Drains and services | Leaking drains may need repairing; services must be located and protected. | Drain relining or replacement, diverting pipes, gas or water near the dig. |
| Trees | Tree management may be part of dealing with the cause. | Arboricultural reports, root barriers, protected trees needing consent. |
| Neighbours | Shared walls usually bring in the Party Wall etc. Act 1996. | Surveyors’ fees on both sides, extra protection to the neighbour’s side. |
| Making good | Cracks, plaster, decoration, floors and paths must be put right after. | Extensive internal cracking, solid floors relaid, patios and paths reinstated. |
How the method changes the price
The engineer chooses the method from the investigation, not from cost alone. Traditional mass concrete underpinning uses simple materials but a lot of digging, so it becomes heavier work as depth increases. Mini-piled underpinning brings in specialist plant and reinforced needles or beams, but can reach firm ground at depths where hand-dug bays would be impractical. Resin injection involves much less excavation and is often done in days, but it only suits certain soils and causes. A cheaper method that does not suit the ground is not a saving.
What costs come before the building work?
Many people are surprised that there are costs before anyone picks up a spade. On a privately funded job these can include:
- Structural engineer’s inspection and report to establish whether the cracking is caused by ground movement at all;
- Site investigation such as trial pits, boreholes and laboratory soil tests, so the engineer knows the footing depth and ground conditions;
- CCTV drain survey where leaking drains are a suspected cause;
- Monitoring of cracks and levels, which RICS says may run for around 12 months or longer to tell seasonal movement from progressive movement;
- Engineer’s design and calculations for the chosen scheme;
- Building Control fees, as underpinning normally needs approval under the Building Regulations;
- Party wall surveyors’ fees where the Act applies, which in terraces and semis it usually does;
- Arboricultural advice where trees are involved, and council consent if a tree is protected.
These steps are not padding. They are what stops a homeowner paying for underpinning that was never needed, or for a scheme that misses the real cause. A structural engineer survey is usually the first money worth spending.
Will my buildings insurance pay for underpinning?
According to the ABI, buildings insurance usually covers subsidence damage to the home. Garden walls, fences, gates, patios and drives are usually only covered if they are damaged at the same time as the house, and alternative accommodation is covered if the home becomes uninhabitable during repairs. The subsidence excess is usually higher than the standard excess; the ABI says most policies set it at around £1,000.
If you think your house is moving, contact your buildings insurer first. The insurer and its loss adjuster decide what is investigated, whether monitoring is needed, whether a tree or drain must be dealt with, and whether underpinning is needed at all. We cannot predict whether a claim will be accepted or what will be paid. Our page on subsidence insurance claims explains how the process usually runs.
How long does underpinning take, and does time affect cost?
MyJobQuote says most underpinning jobs take about three to five weeks on site, with resin injection often only days. Investigation, monitoring, Building Control approval and party wall notices can add several months before work starts. Time on site affects labour and plant hire, so a scheme that is well planned, with access, skips and concrete deliveries sorted in advance, tends to run more smoothly. The overall timescale always depends on the property, the method and the permissions.
How to compare underpinning quotes fairly
Two quotes for “underpinning” can describe very different jobs. Before choosing, check that each quote:
- Follows the same engineer’s design. The depth, method, bay sizes or pile positions should come from the engineer’s drawings, not from the contractor’s guess.
- Covers the same length of wall. One quote for the front bay and another for the whole front elevation are not comparable.
- States what is excluded. Drain repairs, tree work, internal making good, decoration and reinstating paths are often left out.
- Includes Building Control. Check whether the notice and inspections are included or left to you.
- Allows for party walls. If you share a wall, ask how the surveyors’ requirements are allowed for.
- Explains sign-off. You need the engineer’s and Building Control sign-off for a future sale.
Can you keep the cost of subsidence repairs down?
The biggest saving is not underpinning when it is not needed. Many cases are resolved by repairing a drain or managing vegetation, waiting for the ground to stabilise and then carrying out structural crack repair, which is far less disruptive. Our subsidence and cracks guide explains how the cause is usually found. Other sensible steps are to keep gutters and drains in good order, to photograph and date cracks so the engineer has a history, and not to fell or heavily prune trees without advice, because removing a large tree on clay can cause heave.
Where underpinning is needed, a well-targeted scheme often costs less than a broad one. Partial underpinning of a bay or a corner can be appropriate when the investigation shows movement is confined to that area, although the engineer has to design the junction with the unsupported foundations carefully. That decision belongs with the engineer, and we build what is designed for foundation underpinning on Merseyside rather than suggesting shortcuts.
Want to understand what your repair might involve?
Call 07777 659786 and tell us what you have noticed, roughly how old the house is and whether an insurer, buyer or neighbour is involved. We will explain the likely steps and, once the engineer’s design is ready, give you a written quote.
Frequently asked questions
How much does underpinning cost in Liverpool?
National guides give wide ranges: MyJobQuote quotes an average of £13,500 and RICS says £10,000 to £75,000 for a typical house (figures checked November 2026). In Liverpool, as anywhere, the price depends on the method, depth, length of wall, access and permissions. We only price a scheme after the structural engineer has designed it.
Why do underpinning prices vary so much?
Because the jobs vary so much. Supporting one bay window at a shallow depth is a small, contained job, while piling the whole perimeter of a detached house on soft ground is a major project. Access, party wall matters, drains, trees and internal making good can all add significantly to the work involved.
Is mini-piled underpinning more expensive than mass concrete?
Not necessarily. Mini-piling needs specialist plant and reinforced beams or needles, but it can reach firm ground at depths where mass concrete bays would need a great deal of digging. The engineer chooses the method from the ground investigation, and the best value is the method that suits the ground rather than the lowest headline price.
Do I pay for the structural engineer separately?
On privately funded work, the engineer’s inspection, investigation, design and sign-off are usually separate costs from the building work, as are Building Control fees and any party wall surveyors’ fees. On an insurance claim, the insurer arranges its own engineer or loss adjuster. We will tell you which costs our quote covers.
What is the subsidence excess on home insurance?
The ABI says most buildings insurance policies have a subsidence excess of around £1,000, usually higher than the standard excess. Your own policy wording sets the actual figure, so check your schedule or ask your insurer. The insurer also decides what work is covered and how the repair is carried out.
Can I get a price over the phone?
We can explain what usually affects the cost and what the process looks like, but we cannot give a responsible price without seeing the house and the engineer’s design. Any figure given before the ground has been investigated is a guess, and underpinning guesses tend to be wrong by a wide margin.