Bristol · England
Roof structure repairs in Bristol
We arrange surveys and price roof structure repairs throughout Bristol. Bristol has a mix of ground, with clay in some places and firmer rock in others, and we take that into account before recommending a method.
Guide price from£310per rafter inc VAT
- Area
- Bristol
- Pricing region
- South West
- Ground
- Clay in parts
- Towns listed
- 0
How do local ground conditions affect roof structure repairs in Bristol?
Bristol has mixed ground: Mercia Mudstone, limestone and alluvium along the Avon, and Coal Measures under parts of the north and east of the city, where historic shallow workings are recorded. Made ground on old quarry and dock land is also common.
Parts of Bristol lie on a former coalfield, so a coal mining search is worth checking if movement has no obvious cause. What you mostly find across Bristol: Georgian and Victorian terraces on steep streets, inter-war council estates and post-war system-built homes.
Methods for roof structure repairs
Purlin and strut strengthening
Undersized purlins are strengthened with extra timber or replaced, and new struts are taken down to a load-bearing wall. Where there is no suitable wall, an engineer designs the load path. Temporary props hold the roof while members are changed.
Best for: Sagging slopes, slim purlins and struts removed from the loft
Repairing or doubling rafters
Cracked, sagging or rotten rafters are strengthened by fixing a new timber alongside, often called doubling, and rotten rafter feet are cut back and spliced. The work is usually done from inside the loft with the tiles left in place, unless the covering is coming off anyway.
Best for: Individual rafters that have cracked, sagged or rotted at the feet
Tying in roof spread
New ties, collars or steel straps connect opposite rafters, or fix the rafter feet and wall plate firmly to the ceiling joists, so the outward thrust is resisted. Leaning wall heads are strapped back to the roof, and a badly spread roof may need partly rebuilding first.
Best for: Walls pushed out at eaves level by spreading rafters
From first photo to finished repair
Send photos
Photograph the roof from across the street, both slopes if you can, and the loft timbers with a torch. Include the eaves and any cracks just below them. From these we can usually tell sag from spread and whether an engineer is needed.
Engineer’s design where needed
Where purlins, struts or ties must be redesigned, or the roof carries a heavier covering, an independent chartered structural engineer is appointed to specify the work. We can arrange this, and their design sets the sizes and fixings.
Written quote
You receive a no-obligation written quote listing each timber repair, any ties or straps, propping, scaffolding and making good. Once the repair is specified, the figure becomes a fixed price in writing.
Symptoms that point to roof structure repairs
- Roof slope looking hollow or wavy between the ridge and the gutter
- Daylight through the tiles, or timber that is damp, stained or crumbling
- Struts, collars or ties cut out or missing in the loft
- Horizontal cracks in the wall just below the eaves or ceiling line
Guide prices for roof structure repairs in Bristol
For Bristol we use South West rates. Treat the table as a budget guide, inc VAT; the price you pay is the one on your written quote.
| Item | Guide price | Per |
|---|---|---|
| Repairing or doubling a rafter | £310 – £620 | per rafter |
| Purlin and strut strengthening | £1,250 – £3,100 | per roof |
| Tying in roof spread (straps and ties)est. | £825 – £2,600 | per roof |
Do you need approval for roof structure repairs 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
Why do houses in Bristol crack?
Bristol has mixed ground: Mercia Mudstone, limestone and alluvium along the Avon, and Coal Measures under parts of the north and east of the city, where historic shallow workings are recorded. Made ground on old quarry and dock land is also common. Parts of Bristol lie on a former coalfield, so a coal mining search is worth checking if movement has no obvious cause. Only an investigation on site can say why a particular building has moved.
How much will roof structure repairs cost in Bristol?
On South West rates, roof structure repairs starts from about £310 per rafter, including VAT. The written price depends on the extent of the damage, access and whether an engineer or building control is needed.
Is a sagging roof ridge dangerous?
A slight, even dip in an old roof is often historic movement that stopped long ago. A sag that is getting worse, cracking timbers, walls pushing out at the eaves or recently removed struts should be checked soon. Avoid storing heavy items in the loft until then.
Can the roof be strengthened without removing the tiles?
In most cases, yes. Doubling rafters, adding struts and fitting ties can all be done from inside the loft with the coverings in place. Tiles usually only come off where timber near the eaves is badly decayed, or the roof is being re-covered anyway.
Why are there cracks just below the eaves?
A horizontal crack just below the eaves, along the front or back wall, is a common sign of roof spread. The rafters push the top of the wall outward and the masonry cracks where it hinges. Corroded wall ties can cause similar cracks, so the cause needs checking.