Floor joist repairs in Richmond upon Thames

Postcodes: TW1, TW2, TW7, TW9, TW10
Population: about 200,000
Area: Greater London
Pricing region: London

How do local ground conditions affect floor joist repairs in Richmond upon Thames?

We cover the whole of Richmond upon Thames, including postcode districts TW1, TW2, TW7, TW9, TW10; about 200,000 people live in the borough. Neighbouring towns we cover: Hounslow (2 miles), East Molesey (4 miles) and Kingston upon Thames (4 miles).

Greater London is one of the parts of the UK where clay soils are most likely to move with the seasons. Ground movement here is more often linked to soils, drains and trees than to mining. Typical buildings in Greater London: Victorian and Edwardian terraces with shallow footings, inter-war semis in the outer boroughs, and converted flats and mansion blocks.

What to look for before calling about floor joist repairs

Floor dipping towards an outside wall or in the middle of the room
Soft or spongy boards near outside walls, hearths or the bathroom
A musty smell, or fungal strands showing between the boards

Floor joist repairs prices in Richmond upon Thames

These are guide prices for Richmond upon Thames, using London rates and including VAT. Your written quote follows photos or a survey, and is fixed once the repair is specified.

Guide prices inc VAT on London rates. Items marked est. are our estimates.
Item	Guide price	Per
Splicing or sistering a damaged joist	£310 – £500	per joist
Whole room of joists and boards	£2,500 – £7,500	per room
Sleeper wall rebuild and ventilationest.	£500 – £1,900	per room

How we usually approach floor joist repairs

Sleeper walls and ventilation

Settled or damp sleeper walls are rebuilt on a sound base with a damp-proof course under new timber plates. Blocked air bricks are cleared, extra ones added where the void has dead spots, and soil or paving heaped against the outside wall is lowered.

Best for: Damp ground floor voids or joists on poor supports

Sistering a joist

A new length of treated timber, the same depth as the original, is bolted or screwed alongside the damaged joist so the two share the load. It is the quickest fix for a notched, cracked or sagging joist that is otherwise sound, usually after lifting a few boards.

Best for: Cut, cracked or sagging joists with sound ends

What happens during floor joist repairs, step by step?

Photos and a call
Send photos of the dip or soft area, the outside wall at ground level and any air bricks. A short call about when it started, and any recent plumbing or heating work, tells us whether the problem is local or widespread.
Lift boards and inspect
On site we lift a few boards where the floor is worst and check the joist ends, sleeper walls and void with a moisture meter. Outside, we look for high ground, blocked vents and leaks keeping the timber wet.
Relay and ventilate
Boards are relaid or replaced, skirting refitted and air bricks cleared or added outside. We point out anything that would let damp back in, such as soil heaped against the wall, so the repair lasts.

Rules for floor joist repairs in England

Like-for-like repairs such as crack stitching and repointing do not usually need building control approval in England, but anything that changes or strengthens the structure, such as underpinning or rebuilding a wall, does. If the work touches a party wall, the Party Wall etc. Act 1996 may apply.

Questions about floor joist repairs in Richmond upon Thames

How much should I budget for floor joist repairs in Richmond upon Thames?

Guide prices for floor joist repairs in Richmond upon Thames start from about £310 per joist, including VAT, on London rates. Your fixed written price follows photos or a survey and depends on the extent of the work and access.

Can you survey a property in Richmond upon Thames?

Yes. We take enquiries from across Richmond upon Thames, including TW1, TW2, TW7, TW9, and from nearby places such as Hounslow and East Molesey. Send photos for a free initial view and we will tell you what happens next.

Why do houses in Greater London crack?

Most of Greater London sits on London Clay, among the most shrinkage-prone ground in the UK, with river gravels along the Thames. Subsidence claims here are among the most frequent in the country, especially after dry summers and near street and garden trees. Only an investigation can say why a particular building has moved.

Is a sagging floor dangerous?

A gentle, long-standing sag is usually not dangerous, and many older floors have moved slightly over a century. A sag that is getting worse, soft boards or a floor dropping near a wall needs checking soon, because rotten joist ends can lose their bearing.

Do I need building control for floor joist repairs?

Usually not for like-for-like repairs to a few joists, but replacing a whole floor structure can be building work. In Scotland that generally needs a building warrant, and in Northern Ireland council building control applies. We deal with building control where the work needs it.

Related work in Richmond upon Thames

Floor joist repairs near Richmond upon Thames

If a floor in Richmond upon Thames has dropped after plumbing or heating work, send photos of any lifted boards and notches, and we will price the strengthening.