Floor joist repairs in Weymouth

Postcodes: DT3, DT4
Population: about 53,000
Area: Dorset
Pricing region: South West

What should you know about the ground under Weymouth?

Postcode districts DT3, DT4 cover Weymouth, a Dorset town of about 53,000 people. If you are just outside Weymouth, we also cover Dorchester (7 miles), Poole (22 miles) and Yeovil (24 miles).

Parts of Dorset have clay that can shrink near trees in dry spells. Ground movement here is more often linked to soils, drains and trees than to mining. What you mostly find across Dorset: stone and brick villages, Victorian villas in Bournemouth, and inter-war and post-war semis.

Floor joist repairs prices in Weymouth

The ranges below reflect typical South West costs for floor joist repairs, including VAT. Scaffold, access and making good can push a job to the top of the range.

Guide prices inc VAT on South West rates. Items marked est. are our estimates.
Item	Guide price	Per
Splicing or sistering a damaged joist	£260 – £410	per joist
Whole room of joists and boards	£2,050 – £6,200	per room
Sleeper wall rebuild and ventilationest.	£410 – £1,550	per room

How we usually approach floor joist repairs

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

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

What happens during floor joist repairs, step by step?

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.

What to look for before calling about floor joist repairs

Soft or spongy boards near outside walls, hearths or the bathroom
A gap opening up between the skirting board and the floor
Floor dipping towards an outside wall or in the middle of the room

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 Weymouth

How much should I budget for floor joist repairs in Weymouth?

Guide prices for floor joist repairs in Weymouth start from about £260 per joist, 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.

Can you survey a property in Weymouth?

Yes, Weymouth is covered, along with postcode districts DT3, DT4. We also cover nearby Dorchester and Poole.

Why do houses in Dorset crack?

Dorset mixes chalk downs, Oxford and Kimmeridge Clays in the vales, and the sands and gravels of the Poole basin. Clay vales can shrink and swell, and parts of the coast are known for landslip. Only an investigation can say why a particular building has moved.

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.

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.

Related work in Weymouth

Floor joist repairs near Weymouth

Send photos of the floor and the outside wall at your Weymouth property for a free initial assessment and a no-obligation written quote.