A roof is not one job but a system: the covering itself, the underlay and battens beneath it, the flashing at every junction, and the gutters and trims that carry water away. In 2026, a full replacement on a typical 3-bed semi costs £6,000–£14,000, while material choice alone can swing the price from £40/m² for felt to over £200/m² for natural slate, installed.
This guide brings our roofing library together in one place — new roofs and roof windows, materials compared, flat roofs, the flashing and batten details, gutters and chimneys, ongoing repairs, and the damp and waterproofing issues that tend to come up in the same conversation.
New Roofs, Windows and Lanterns
Most re-roofs happen reactively rather than by choice. Roof replacement: signs you need one sets out the tell-tale signs — widespread batten rot, failed underlay, more than 20% of tiles gone — against the £6,000–£14,000 typical cost.
A re-roof or loft conversion is also the natural moment to add glazing. Roof window sizes explained decodes the Velux code system so you order the right unit first time, and where the structure below has a flat roof, a roof lantern usually makes more sense than a flush rooflight — our guide to rooflight and lantern materials compares U-values and cost across both. Choosing between rooflights and a full dormer for a loft specifically? Rooflight vs dormer loft conversion compares the space and cost trade-off directly.
Roofing Materials Compared
Material choice drives most of the difference between quotes. Roofing materials compared lines up slate, tile, felt and metal by cost per m² and lifespan in one table. If you’re set on slate specifically, natural slate vs fibre-cement slate explains why the natural product costs two to three times more, and slate roof tile types and lifespan breaks down Welsh, Spanish and synthetic options. Whichever you choose, roof tile and slate fixing rules covers the BS 5534 nailing and clipping requirements that now apply across most UK exposure zones.
| Material | Installed Cost | Typical Lifespan |
|---|---|---|
| Natural slate | £130–£220/m² | 80–150 years |
| Concrete tile | £80–£120/m² | 40–60 years |
| GRP flat roof | £65–£110/m² | 30–50+ years |
| EPDM flat roof | £55–£95/m² | 30–50+ years |
| Felt flat roof | £40–£70/m² | 10–15 years |
[!tip] Get the Inspection Before You Get the Quote A £100–£250 roof inspection before you call contractors gives you an independent view of what actually needs doing — repair, partial re-cover, or full replacement — so you can spot a quote that’s over- or under-specified before you sign anything.
Flat Roofs
Extensions and garages usually mean a flat roof, and material choice matters more here because lifespans vary so widely. Flat roof types and costs compares EPDM, GRP and felt on price and durability, and EPDM vs GRP flat roof materials goes deeper on warm-roof build-ups for either system. Deciding whether to go flat or pitched at all? Flat roof vs pitched roof compares the two on cost and maintenance, and where the question is specifically about a loft dormer, flat-roof vs pitched-roof dormers covers the planning and lifespan differences that apply there.
Flashing, Battens and the Details
The details are what actually keep a roof watertight. Lead is still the default at abutments, valleys and chimneys — our guide to lead flashing alternatives covers Code 4 lead at £25–£45/m installed alongside cheaper Ubiflex and flashband options for theft-risk areas. Underneath the tiles, roof batten sizes and grading and roofing battens and felt specification both cover BS 5534-graded treated timber, while roofing membranes and breathable felt explains why breathable underlay has replaced traditional bitumen felt on most modern re-roofs.
Gutters, Fascias and Chimneys
Rainwater goods and the roofline trim take the most weather exposure of any external element. Guttering and downpipe materials compares uPVC, cast iron and aluminium on cost and lifespan. The boards behind them are covered in barge board, fascia and soffit replacement costs and, for what the three terms actually mean, how fascias, soffits and bargeboards differ. Chimneys need their own attention: chimney repair and flashing costs covers repointing and stack removal from the roof, while removing a chimney breast is the internal, structural side of the same job.
Repairs and Maintenance
Not every problem needs a full re-roof. Roof repair costs and common problems breaks down minor slate and flashing repairs against the point where replacement becomes cheaper, and roof felt replacement explains the signs that it’s the underlay failing rather than the tiles. A roof inspection before you commit to either is money well spent. Guttering needs the same routine attention — see gutter cleaning and repair. And if you’re buying materials rather than paying a contractor to supply them, roofing merchants and suppliers covers trade pricing and bulk ordering.
Damp, Waterproofing and Soundproofing
A sound roof is only part of keeping a building envelope dry and quiet. Below ground, cellar tanking and waterproofing covers the BS 8102 grades for basements, and damp proofing methods and costs explains how to diagnose rising, penetrating and condensation damp before specifying a fix. Above ground, draught-proofing your home is the cheapest of all these fixes and pays for itself within a year or two, while wet room tanking and waterproofing is the equivalent job inside a shower room. Noise is a related nuisance: soundproofing a room covers mass, decoupling and sealing for walls and ceilings, and soundproofing noisy pipes and soil stacks deals with the specific rattle of plumbing runs.
Where to Start
If your roof is visibly failing, start with roof replacement: signs you need one to confirm it’s actually time. For a full cost comparison across materials, roofing materials compared is the fastest way to see where your budget lands. And if the issue is a leak rather than a full re-roof, lead flashing alternatives is one of the most common single points of failure worth checking first.
