Wales
Structural repairs in Gwynedd
Structural repairs across Gwynedd: subsidence, cracks, underpinning, wall ties, lintels and claim repairs. Shrinkable clay is less common in Gwynedd than in south-east England.
- Nation
- Wales
- Pricing region
- Wales
- Towns listed
- 6
- Mining legacy
- Metal mining
What is the ground like in Gwynedd?
Gwynedd and Anglesey are mostly hard rock with glacial deposits, so clay shrinkage is uncommon. Historic slate quarrying and metal mining have left tips and workings in places.
Old metal-mine shafts and workings are recorded in places, so mining searches are routine for some properties.
What usually causes cracking in Gwynedd?
These are the things we most often check for in Gwynedd. The repair only lasts if the cause has stopped.
- Loose or saturated ground where water has collected around foundations
- Old metal mine shafts and adits in the uplands
- Weathered lime mortar letting stone walls spread
- Heavy stone chimneys and gables pulling away from the house
- Leaking or broken drains washing fine soil out from under footings
What kind of buildings are common here?
Slate and stone terraces, chapels and cottages, Victorian seaside houses and post-war estates.
Which repairs do we carry out in Gwynedd?
- Chimney stack repairs
- Concrete repairs
- Bay window subsidence repairs
- Floor joist repairs
- Underpinning
- Resin injection ground stabilisation
- Structural surveys and crack monitoring
- Lintel replacement
- Structural crack repairs
- Subsidence insurance claim repairs
- Extension pulling away repairs
- Crack stitching
- Roof structure repairs
- Bowing wall repairs
- Subsidence repairs
- Gable end wall repairs
- Wall tie replacement
- Boundary and garden wall repairs
- Retaining wall repairs
- Brick arch repairs
Guide prices in Gwynedd
A selection of guide prices on Wales rates, including VAT. Each repair page has the full table.
| Item | Guide price | Per |
|---|---|---|
| Crack stitching: crack stitching with stainless helical bars | £75 – £165 | per metre of crack |
| Underpinning: mass-concrete underpinning | £920 – £1,400 | per metre of wall |
| Lintel replacement: standard window or door opening | £690 – £2,300 | per opening |
| Bowing wall repairs: lateral restraint for a typical gable | £920 – £2,750 | per wall |
Towns we cover in Gwynedd
We list 6 towns in Gwynedd, covering 7 postcode districts in the LL postcode area. The largest are Bangor (about 18,000 people), Llandudno (about 15,000 people) and Holyhead (about 11,000 people). Each town page has local postcodes, nearby places and the repairs we carry out there.
Do repairs in Gwynedd need approval?
In Wales, small like-for-like repairs rarely need approval, but underpinning and strengthening go through building control under the Welsh Building Regulations.
Questions about structural repairs in Gwynedd
Do you cover the whole of Gwynedd?
Yes. We take enquiries from across Gwynedd, including Bangor, Llandudno, Holyhead and Caernarfon. A free initial assessment from your photos is the first step.
Is Gwynedd affected by subsidence?
Most of Gwynedd is on firmer ground than the clay belts of the south-east. Old metal-mine shafts and workings are recorded in places, so mining searches are routine for some properties. Whether a particular building has moved, and why, needs an investigation on site.
How much do structural repairs cost in Gwynedd?
It depends on the repair. On Wales rates, crack stitching from about £75 per metre of crack and mass-concrete underpinning from about £920 per metre of wall, including VAT. Your written price follows photos or a survey.
What should I send for a free assessment in Gwynedd?
Photos of each crack inside and out with a coin or tape for scale, a wider shot showing where it is on the building, your postcode in Gwynedd, and when you first noticed it. If an insurer is involved, include the claim reference.