Coleraine · County Londonderry
Floor joist repairs in Coleraine
If a plumber or electrician has recently had the boards up at your Coleraine 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£220per joist inc VAT
- Postcodes
- BT52
- Population
- about 26,000
- Area
- County Londonderry
- Pricing region
- Northern Ireland
What should you know about the ground under Coleraine?
Coleraine is in County Londonderry and takes in postcode districts BT52. About 26,000 people live there. If you are just outside Coleraine, we also cover Ballymoney (7 miles), Limavady (13 miles) and Ballymena (24 miles).
Most of County Londonderry is on firmer ground than the clay belts of the south-east. Ground movement here is more often linked to soils, drains and trees than to mining. Housing stock in County Londonderry: Georgian and Victorian houses in Derry, brick terraces and post-war estates.
Which repair method suits a home in Coleraine?
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
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
What happens when we carry out floor joist repairs in Coleraine?
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.
Repair the structure
Boards are lifted and numbered if they are going back, and rotten timber is cut out. New treated timber is fixed and checked with a level before strutting, hangers and any restraint straps go in.
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 musty smell, or fungal strands showing between the boards
- 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 Coleraine?
The ranges below reflect typical Northern Ireland costs for floor joist repairs, including VAT. Scaffold, access and making good can push a job to the top of the range.
| Item | Guide price | Per |
|---|---|---|
| Splicing or sistering a damaged joist | £220 – £350 | per joist |
| Whole room of joists and boards | £1,750 – £5,300 | per room |
| Sleeper wall rebuild and ventilationest. | £350 – £1,300 | per room |
Rules for floor joist repairs in Northern Ireland
In Northern Ireland, minor repairs usually need no approval, but structural work comes under the Building Regulations (Northern Ireland) 2012 and council building control. There is no Party Wall Act in Northern Ireland.
Floor joist repairs in Coleraine: questions and answers
What is the price of floor joist repairs in Coleraine?
Guide prices for floor joist repairs in Coleraine start from about £220 per joist, including VAT, on Northern Ireland 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 Coleraine?
Yes. We take enquiries from across Coleraine, including BT52, and from nearby places such as Ballymoney and Limavady. Send photos for a free initial view and we will tell you what happens next.
Does the ground around Coleraine cause cracking?
County Londonderry has basalt, older hard rock and glacial deposits, with soft river ground along the Foyle and Bann. Only an investigation can say why a particular building has moved.
What causes rot in floor joists?
Damp causes almost all joist rot. Joist ends in damp walls, voids with blocked air bricks, leaking pipes and high outside ground levels keep timber wet enough for fungi to grow. Replacing timber without fixing the damp usually means the rot returns.
Will my insurance pay for rotten floor joists?
Usually not, because rot, woodworm and gradual wear are standard exclusions. Damage from a sudden escape of water, or a floor that dropped through subsidence, may be treated differently. Check your policy, and tell your insurer before permanent repairs start if either applies.
More repairs we carry out in Coleraine
- Chimney stack repairs
- Roof structure repairs
- Structural crack repairs
- Subsidence insurance claim repairs
- Concrete repairs
Floor joist repairs near Coleraine
If a floor in Coleraine has dropped after plumbing or heating work, send photos of any lifted boards and notches, and we will price the strengthening.