How long does it take to replace a warehouse roof?

Published 20 June 2026 · Last updated 12 July 2026 · Written and fact-checked by Paul Whitmore, Lead Reviewer · Reviewed against our published judging process

A straightforward warehouse roof replacement of around 1,000m² typically takes 3 to 6 weeks, while a 5,000m² strip and replace runs 2 to 4 months. Over-roofing, fitting a new insulated system over the existing roof, is typically 30 to 50 per cent faster and keeps the building watertight and trading throughout.

Those ranges are honest planning figures, not promises, and the spread inside them is driven by a handful of factors you can identify before a single sheet moves.

The timeline at a glance

• 1,000m² strip and replace: typically 3 to 6 weeks
• 5,000m² strip and replace: typically 2 to 4 months
• Over-roofing: typically 30 to 50 per cent faster than the equivalent strip
• Biggest programme risks: asbestos discovery, weather, and access constraints

What stretches the programme

Asbestos is the big one. If the existing roof is asbestos cement, licensed removal changes both the pace and the sequencing, and discovering it mid-project rather than at survey is the classic way a six-week job becomes a four-month one. Contractors with the asbestos licence in-house keep that risk inside the same programme instead of waiting on a third party.

Weather sits second, because stripping a roof opens the building to the sky, and sensible contractors strip only what they can re-cover the same day. Access sits third: eaves height, scaffold or MEWP strategy, and how much of the yard the business can give up all set the daily production rate.

Why over-roofing is usually faster

Over-roofing removes the most dangerous, slowest part of the job, the strip, and with it most of the weather risk, since the old roof keeps doing its job until the new one is on. Where the structure can take the load and the existing covering is sound enough to stay, it is faster, safer and usually cheaper. It is also the standard route over asbestos cement, encapsulating it rather than disturbing it.

From the tools: the fastest warehouse re-roof I have watched was 4,000-odd square metres done in under seven weeks, phased over a live distribution operation that never missed a shift. The secret was boring: a proper survey months earlier, asbestos mapped and priced, materials on site before day one, and a contractor whose crews had done that exact building type fifty times. Speed on a roof is planning wearing a hi-vis.

Planning your own programme

Survey first, always, and make every bidder price over-roofing as an alternative where it is viable. Get the phasing plan in writing, agree which zones close and when, and pressure-test the asbestos allowance. The firms that run these programmes best are ranked in our best warehouse roofing contractors in the UK, the costs behind them are unpacked in what industrial roof replacement really costs, and the profile of the contractor built for the biggest programmes is in who Nationwide Industrial Roofing are.

Paul has spent more than twenty years around industrial buildings and writes practical trade guides for The UK Trades Awards.

Paul Whitmore, Lead Reviewer. Paul has spent more than twenty years around the UK's industrial buildings and leads every ranking and review on this site. Read his full profile.