Colwyn Bay · Clwyd
Floor joist repairs in Colwyn Bay
If a plumber or electrician has recently had the boards up at your Colwyn Bay home, the joists they worked around are worth a look. Deep notches and holes in the wrong place weaken joists quickly, and sistering them is usually a short, tidy job.
Guide price from£230per joist inc VAT

- Postcodes
- LL28, LL29
- Population
- about 29,000
- Area
- Clwyd
- Pricing region
- Wales
What should you know about the ground under Colwyn Bay?
Colwyn Bay, Clwyd: about 29,000 residents across postcode districts LL28, LL29. We also take enquiries from nearby Llandudno (5 miles), Abergele (6 miles) and Rhyl (10 miles).
Parts of Clwyd have clay that can shrink near trees in dry spells. Parts of Clwyd lie on a former coalfield, so a coal mining search is worth checking if movement has no obvious cause. Housing stock in Clwyd: Brick colliery terraces, seaside villas in Rhyl and Colwyn Bay, and post-war estates.
What happens when we carry out floor joist repairs in Colwyn Bay?
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.
Written quote
You get a no-obligation written quote listing which joists are sistered, spliced or replaced and any sleeper wall or ventilation work. It becomes a fixed price in writing once the repair is specified.
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.
Signs you may need floor joist repairs
- A gap opening up between the skirting board and the floor
- Floor dipping towards an outside wall or in the middle of the room
- Soft or spongy boards near outside walls, hearths or the bathroom
How much will floor joist repairs cost in Colwyn Bay?
Guide prices below are for homes in Colwyn Bay, on Wales rates and including VAT. A survey or good photos let us turn them into a fixed written price.
| Item | Guide price | Per |
|---|---|---|
| Splicing or sistering a damaged joist | £230 – £370 | per joist |
| Whole room of joists and boards | £1,850 – £5,500 | per room |
| Sleeper wall rebuild and ventilationest. | £370 – £1,400 | per room |
Which repair method suits a home in Colwyn Bay?
Splicing ends and fitting hangers
Where only the end has rotted, it is cut back to sound timber and a new piece is fixed alongside, bearing on the wall or on a new joist hanger. Missing or under-nailed hangers elsewhere are replaced at the same time. The damp in the wall must be fixed too.
Best for: Rotten joist ends in damp solid walls
Replacing joists and boards
When rot or woodworm runs through most of a floor, it is usually cheaper to replace the joists, strutting and boards together. Where joists run parallel to an outside wall, restraint straps tie the new floor back to it so the wall keeps its lateral support.
Best for: Widespread rot, or a whole floor that has dropped
Rules for floor joist repairs in Wales
In Wales, small like-for-like repairs do not usually need approval, but work that alters or strengthens the structure needs building control under the Welsh Building Regulations, and the Party Wall etc. Act 1996 can apply to shared walls.
Floor joist repairs in Colwyn Bay: questions and answers
What is the price of floor joist repairs in Colwyn Bay?
Guide prices for floor joist repairs in Colwyn Bay start from about £230 per joist, including VAT, on Wales rates. Your fixed written price follows photos or a survey and depends on the extent of the work and access.
Do you carry out floor joist repairs in Colwyn Bay?
Yes. We take enquiries from across Colwyn Bay, including LL28, LL29, and from nearby places such as Llandudno and Abergele. Send photos for a free initial view and we will tell you what happens next.
Does the ground around Colwyn Bay cause cracking?
The North Wales coalfield runs beneath parts of Wrexham and Flintshire, where historic workings are recorded, while the coast and vale have glacial clays and the hills are older hard rock. Only an investigation can say why a particular building has moved.
Why is my floor bouncy?
A bouncy floor usually means the joists are deflecting too much, often because they span too far, have lost their strutting or have been weakened by notches. It rarely means imminent failure, but it is worth checking, especially if the bounce appeared after work in the room.
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.
More repairs we carry out in Colwyn Bay
- Lintel replacement
- Bowing wall repairs
- Retaining wall repairs
- Resin injection ground stabilisation
- Structural surveys and crack monitoring
Floor joist repairs near Colwyn Bay
Got a bouncy or sinking floor in Colwyn Bay? Send a short video of someone walking across it, and we will tell you what it is likely to need.