New roof (new build / extension) in Cardiff
New roof construction on an extension or new build — full covering, underlayment, structure coordination.
Wales · updated 2026-04-11 · 0 local roofers in directory
Typical cost in Cardiff
£90–£220/m²
Mid-market: £140/m². Ranges are indicative; real quotes vary with scope, access, and materials.
See the full UK roofing cost guide for the methodology and the factors that move a quote up or down.
What the job involves
A new roof on an extension or new build is specified as part of the overall project. The roofer’s scope usually starts once the rafters and boarding are in place: laying the underlayment, fitting battens, and installing the chosen covering.
Building Regulations Part L and Part C apply to all new construction. The covering has to hit specific U-values, the underlayment has to resist the passage of moisture, and the detailing at abutments and eaves has to handle wind uplift — all covered in BS 5534.
Cardiff — local context
Traditional material: Welsh slate (locally quarried) on Victorian terraces.
Pontcanna, Cathays and Roath contain dense Victorian terrace stock with original Welsh slate; the material is local to Wales and typically specified on heritage re-roofs.
What changes the price
- Covering material and underlayment specification.
- Coordination with the main contractor and other trades.
- Complexity — dormers, rooflights, solar provision.
- Height, pitch, and scaffolding plan.
Timeline: Roofer’s portion of a new-build extension is usually 3–8 days depending on complexity.
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Start my quote requestCommon questions
Who is responsible for Part L compliance — me or the roofer?
For a new build or extension, the person commissioning the work is the “relevant person” under Building Regulations. In practice the main contractor (or for a roof-only job, the roofer) takes responsibility for issuing the compliance certificate, often via CompetentRoofer self-certification.
Can I use a different covering from the rest of the house?
In most situations yes, but in conservation areas and on listed buildings the planning authority may require the extension roof to match the main house.
What does new roof (new build / extension) typically cost in Cardiff?
A typical new roof (new build / extension) job in Cardiff falls in the £90–£220/m² range, with the middle of the market around £140/m². Cardiff’s labour and access factor (1.00× the national baseline) means prices run at the UK average. Actual quotes vary with access, materials, and specifics of the job.
Are there any Cardiff-specific things that affect price?
Pontcanna, Cathays and Roath contain dense Victorian terrace stock with original Welsh slate; the material is local to Wales and typically specified on heritage re-roofs.
How many roofers serve Cardiff through this site?
Our directory is still being built out for Cardiff. You can still submit a quote request — it will be held for matching once local roofers are onboarded.
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