How Long Does It Take to Replace a Roof?

The Short Answer: Most Roof Replacements Take One to Three Days

For a standard semi-detached or terraced house in Cambridge, a full roof replacement typically takes one to two days. Larger detached properties — the kind you'll find in areas like Great Shelford or Histon — can run to three days or occasionally a little longer. That estimate assumes good weather, straightforward access, and no hidden structural surprises once the old tiles come off.

The timeline isn't a guess — it's driven by the size of the roof, the pitch, the material being laid, and what we find underneath. Here's what actually affects how long your job will take.

Key Factors That Affect the Timescale

Roof Size and Pitch

A compact two-bedroom terrace in Romsey or Petersfield might have around 40–60 square metres of roof area. A four-bedroom detached house can easily reach 120 square metres or more. Steeper pitches take longer to work safely and slow the stripping and tiling process down. Most pitched roofs in Cambridge are between 35° and 45°, which is manageable but not fast going.

Roofing Material

Concrete interlocking tiles are quicker to lay than natural slate, which requires individual nailing and careful alignment. Clay plain tiles — common on older Cambridge properties and Victorian terraces near the city centre — are slower still because each tile is small and overlaps must be checked precisely. If you're having a flat roof replaced rather than a pitched one, the timeline differs again: a torch-on felt or EPDM rubber system on a garage or rear extension can often be finished in a single day.

Structural and Timber Work

Once the old covering comes off, we sometimes find rotten or damaged roof timbers — particularly on properties built before the 1960s where the original battens have never been touched. Replacing a section of batten or sarking felt adds time. If rafters are compromised, that can add a day or more. We always check before we quote, but some issues only become visible after stripping.

Access and Scaffolding

Most roof replacements require scaffolding, which typically goes up the day before work starts. On terraced streets in central Cambridge or tighter village roads in Cottenham, scaffold erection can take longer due to restricted access. Scaffolding is usually struck within a day or two of completion, so factor that into your overall timeline.

Does Weather Cause Delays?

Cambridgeshire's climate is drier than much of England — the county sits in one of the driest regions in the UK, with annual rainfall averaging around 550–600mm. That's genuinely helpful for roofing schedules. That said, high winds are a regular feature, particularly in autumn and winter, and no responsible roofer works on a pitched roof in gusts above around 23 mph.

We keep a close eye on forecasts and plan the strip-off phase when dry weather is confirmed for at least 24–48 hours. Leaving a roof partially stripped overnight is unavoidable on larger jobs, but we always lay temporary waterproof sheeting to protect the interior.

Planning Permission and Building Regulations

In most cases, a like-for-like roof replacement doesn't require planning permission under permitted development rules. However, if you're in a conservation area — and Cambridge has several, including around the city centre and parts of Newnham — you may need to notify the council before changing roofing materials or altering the roof's appearance. GOV.UK's planning permission guidance is the clearest starting point for checking your obligations.

Building regulations do apply to roof replacements, particularly around thermal performance (insulation) and structural adequacy. We handle all notifications as part of our roof replacement service. It's always worth asking any roofer you're considering whether they'll take care of this — some don't.

What to Expect on the Day

Our team typically arrives between 7:30 and 8am. Stripping the old covering is the noisiest part and usually takes a morning for an average house. Felt and batten go down next, followed by the new tiles or slates. Ridge, hip tiles, and any lead flashing work — such as around chimney stacks or dormers — are finished last. We tidy up as we go and carry waste away at the end of each day.

If you want to know whether your roofer meets recognised quality standards, the National Federation of Roofing Contractors (NFRC) maintains a register of vetted members.

Get a Free Roof Survey in Cambridge

If you're unsure whether you need a repair or a full replacement, we'll come out and give you an honest assessment. We cover Cambridge and the surrounding villages — no call-out charge, no obligation. Contact us to arrange a free local roof survey and we'll give you a clear timeline and fixed price before any work begins.

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