Redruth · Cornwall
Underpinning in Redruth
Before any underpinning goes ahead on a Redruth property, building control has to approve the design and inspect the excavations. Where the wall is shared, party wall notices may be needed too in England and Wales, so allow time for paperwork before the dig.
Guide price from£1,050per metre of wall inc VAT
- Postcodes
- TR15, TR16
- Population
- about 43,000
- Area
- Cornwall
- Pricing region
- South West
Is Cornwall prone to ground movement?
Postcode districts TR15, TR16 cover Redruth, a Cornwall town of about 43,000 people. If you are just outside Redruth, we also cover Camborne (4 miles), Truro (8 miles) and Falmouth (9 miles).
Shrinkable clay is less common in Cornwall than in south-east England. Old metal-mine shafts and workings are recorded in places, so mining searches are routine for some properties. Housing stock in Cornwall: Granite and slate-stone cottages, cob buildings, Victorian terraces and post-war estates.
Symptoms that point to underpinning
- Movement continuing through more than one winter of monitoring
- Footings found to be very shallow during a trial pit
- One corner of the house visibly lower than the others
Guide prices for underpinning in Redruth
Prices in Redruth are worked out on South West rates. They include VAT and are a starting point: access, the extent of the damage and whether an engineer or building control is involved all move the figure.
| Item | Guide price | Per |
|---|---|---|
| Mass-concrete underpinning | £1,050 – £1,550 | per metre of wall |
| Beam-and-base underpinning | £1,550 – £2,600 | per metre of wall |
| Mini-piled underpinning | £2,050 – £3,600 | per metre of wall |
| Engineer's design and building control feesest. | £825 – £2,600 | per scheme |
Methods for underpinning
Mini-piled underpinning
Small-diameter piles are driven or bored down to firm ground and linked by a reinforced beam or needles that pick up the wall. Compact rigs fit through narrow access, and the method reaches depths that would be impractical to excavate by hand.
Best for: Deep soft ground, tree roots, or restricted access
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
From first photo to finished repair
Engineer’s investigation
An independent chartered structural engineer studies the monitoring results, trial pits and soil tests, then decides whether underpinning is needed and which method suits. We can arrange the engineer if you do not already have one.
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.
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.
Frequently asked questions
What is the price of underpinning in Redruth?
Guide prices for underpinning in Redruth start from about £1,050 per metre of wall, including VAT, on South West rates. Your fixed written price follows photos or a survey and depends on the extent of the work and access.
Do you carry out underpinning in Redruth?
Yes. We take enquiries from across Redruth, including TR15, TR16, and from nearby places such as Camborne and Truro. Send photos for a free initial view and we will tell you what happens next.
Does the ground around Redruth cause cracking?
Cornwall is mostly granite and slate with little shrinkable clay, so clay subsidence is less common than in the south-east. Historic tin and copper mining has left shafts and workings in places such as Camborne and Redruth, and mining searches are routine there. Only an investigation can say why a particular building has moved.
Does my house really need underpinning?
Often not, because most subsidence is fixed by repairing drains or managing trees and then repairing the cracks. Underpinning is justified when monitoring shows movement continuing after the cause has been dealt with, or when the ground itself is unsuitable. An independent engineer should make that call.
Can I stay in my house during underpinning?
Most people stay at home during external underpinning, because the digging happens outside along the wall. Expect noise, restricted access to that side of the house and some dust. If the work has to be done from inside, through the floor, moving out for part of the job is sometimes advised.
More repairs we carry out in Redruth
- Floor joist repairs
- Crack stitching
- Structural crack repairs
- Boundary and garden wall repairs
- Brick arch repairs
Underpinning near Redruth
For a no-obligation written quote on underpinning in Redruth, send photos of the cracking and any engineer’s report you already hold.