Harpenden · Hertfordshire
Roof structure repairs in Harpenden
If the top of a wall at your Harpenden property seems to lean out at the eaves, the roof may be spreading. Ties, collars and straps can usually hold it back, sometimes with an engineer’s design for the new load path.
Guide price from£315per rafter inc VAT
- Postcodes
- AL5
- Population
- about 31,000
- Area
- Hertfordshire
- Pricing region
- East of England
What should you know about the ground under Harpenden?
We cover Harpenden and its postcode districts AL5, part of Hertfordshire, with a population of roughly 31,000. Neighbouring towns we cover: St Albans (5 miles), Luton (5 miles) and Hemel Hempstead (6 miles).
Shrinkable clay is widespread in Hertfordshire. Ground movement here is more often linked to soils, drains and trees than to mining. Housing stock in Hertfordshire: Garden-city houses in Letchworth and Welwyn, 1930s semis, Victorian terraces and post-war new-town estates.
Signs you may need roof structure repairs
- Daylight through the tiles, or timber that is damp, stained or crumbling
- Ridge line dipping in the middle when seen from the street
- Horizontal cracks in the wall just below the eaves or ceiling line
How much will roof structure repairs cost in Harpenden?
These are guide prices for Harpenden, using East of England rates and including VAT. Your written quote follows photos or a survey, and is fixed once the repair is specified.
| Item | Guide price | Per |
|---|---|---|
| Repairing or doubling a rafter | £315 – £630 | per rafter |
| Purlin and strut strengthening | £1,250 – £3,150 | per roof |
| Tying in roof spread (straps and ties)est. | £840 – £2,600 | per roof |
Which repair method suits a home in Harpenden?
Wall plate replacement
Rotten or crushed wall plates are replaced in short lengths while the rafters above are propped, and bedded on the wall in mortar. The plate is then strapped down to the masonry. It is often combined with rafter foot splices along the same run.
Best for: Rot along the eaves where rafters bear on the wall
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
What happens when we carry out roof structure repairs in Harpenden?
Loft and outside survey
On site we check rafter sizes and spacing, purlins, struts, ties and wall plates, look for rot and past alterations, and measure any lean at the wall head. The covering is noted too, because its weight affects the repair.
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.
Prop, strengthen and tie
The roof is propped where members are being changed, then rafters, purlins, struts and ties are repaired or added as specified. Coverings disturbed by the work are relaid, and building control inspects where the work needs it.
Rules 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.
Roof structure repairs in Harpenden: questions and answers
How much should I budget for roof structure repairs in Harpenden?
Guide prices for roof structure repairs in Harpenden start from about £315 per rafter, including VAT, on East of England 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 Harpenden?
Yes. We take enquiries from across Harpenden, including AL5, and from nearby places such as St Albans and Luton. Send photos for a free initial view and we will tell you what happens next.
Why do houses in Hertfordshire crack?
South Hertfordshire around Watford, Borehamwood and Potters Bar is London Clay, while the north and west are chalk with clay-with-flints and the east has boulder clay. The clay areas are prone to seasonal subsidence near trees. Only an investigation can say why a particular building has moved.
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.
Do roof structure repairs need building control?
Usually yes, where the structure is strengthened or altered, or the covering becomes significantly heavier. In England and Wales that falls under Part A, in Scotland it generally needs a building warrant, and in Northern Ireland council building control approves it. We deal with building control where the work needs it.
Related work in Harpenden
- Structural surveys and crack monitoring
- Bay window subsidence repairs
- Lintel replacement
- Subsidence repairs
- Resin injection ground stabilisation
Roof structure repairs near Harpenden
Seen the ridge dip at your Harpenden home? Photograph it from across the road, add a few loft shots, and we will tell you what it likely needs.