Northampton · Northamptonshire
Underpinning in Northampton
If an engineer has recommended underpinning for your Northampton home, we can price the scheme from their drawings and calculations. You receive a fixed price in writing that covers the method, the length of wall, access and the making good afterwards.
Guide price from£980per metre of wall inc VAT
- Postcodes
- NN1, NN2, NN3, NN4, NN7
- Population
- about 250,000
- Area
- Northamptonshire
- Pricing region
- East Midlands
What is the ground like in Northamptonshire?
Northampton is in Northamptonshire and takes in postcode districts NN1, NN2, NN3, NN4, NN7. About 250,000 people live there. If you are just outside Northampton, we also cover Wellingborough (9 miles), Daventry (12 miles) and Rushden (12 miles).
Shrinkable clay is widespread in Northamptonshire. Historic ironstone working has left disturbed ground in places. What you mostly find across Northamptonshire: ironstone and limestone cottages, Victorian terraces in Northampton and Kettering, and new-town estates in Corby.
Underpinning prices in Northampton
Guide prices below are for homes in Northampton, on East Midlands rates and including VAT. A survey or good photos let us turn them into a fixed written price.
| Item | Guide price | Per |
|---|---|---|
| Mass-concrete underpinning | £980 – £1,450 | per metre of wall |
| Beam-and-base underpinning | £1,450 – £2,450 | per metre of wall |
| Mini-piled underpinning | £1,950 – £3,450 | per metre of wall |
| Engineer's design and building control feesest. | £785 – £2,450 | per scheme |
How we usually approach underpinning
Mass concrete underpinning
The traditional method. Short sections under the wall are dug out in a set sequence, usually about a metre at a time, and filled with concrete before the next section is opened. It suits moderate depths and good access, and it needs little specialist plant.
Best for: Shallow failures on firm ground found at moderate depth
Beam-and-base underpinning
A reinforced concrete beam is cast beneath or alongside the existing footing and carries the wall onto mass concrete bases at intervals. It spreads load well across variable ground and can mean less digging than continuous underpinning along the whole wall.
Best for: Longer runs of wall or heavier loads over variable ground
What happens during underpinning, step by step?
Design and approvals
The engineer produces drawings and calculations. We make the building control or building warrant application, and party wall notices are served where the law requires them, before any digging starts.
Fixed written price
With the design in hand we confirm a fixed price in writing, setting out the method, the length of wall, access arrangements and the making good. For insurance work we can price to the loss adjuster’s or engineer’s schedule.
Excavation and concrete
Work runs in the sequence the engineer sets so the wall is never left unsupported over a long length. Building control inspects the excavations before concrete goes in, and each section is dry-packed tight to the footing above.
What to look for before calling about underpinning
- Movement continuing through more than one winter of monitoring
- A large tree nearby that cannot be removed or reduced
- Cracks that keep widening after the drains have been repaired
Rules for underpinning in England
In England, underpinning and other work that alters or strengthens a wall or foundation is building work under the Building Regulations (Part A, structure), so building control approves and inspects it. Like-for-like repairs often are not, and we tell you which applies before a price is agreed. Work to a party wall, or excavation close to a neighbour’s foundations, can also need a notice under the Party Wall etc. Act 1996.
Questions about underpinning in Northampton
How much will underpinning cost in Northampton?
Guide prices for underpinning in Northampton start from about £980 per metre of wall, including VAT, on East Midlands rates. Your fixed written price follows photos or a survey and depends on the extent of the work and access.
Do you cover Northampton?
Yes, Northampton is covered, along with postcode districts NN1, NN2, NN3, NN4. We also cover nearby Wellingborough and Daventry.
Is the ground in Northamptonshire prone to subsidence?
Northamptonshire sits largely on Lias clay and Jurassic ironstones and limestones, with historic ironstone quarrying around Corby and Kettering. The clay vales are prone to shrinkage near trees. Only an investigation can say why a particular building has moved.
Can you underpin only part of a house?
Yes, partial underpinning of one corner or one wall is common, though the engineer must think about the junction with the unstrengthened part. A sudden change in foundation depth can cause new cracking, so the scheme may step down gradually or include a movement joint.
Which underpinning method is best?
The right method depends on how deep firm ground lies, the load on the wall and the access. Mass concrete suits moderate depths, beam-and-base spreads heavier loads, and mini-piles reach deep soft ground or work through tight access. The engineer chooses the method from the site investigation.
Other structural repairs in Northampton
- Roof structure repairs
- Bowing wall repairs
- Boundary and garden wall repairs
- Lintel replacement
- Chimney stack repairs
Underpinning near Northampton
For a no-obligation written quote on underpinning in Northampton, send photos of the cracking and any engineer’s report you already hold.