How much does a garage roof replacement cost?

Garage roofs are the most replaced roofs in the country: they are small, cheaply built in the first place, and left to fail because nothing precious sits underneath. The price swings mainly on the covering you choose and whether the old roof turns out to be asbestos cement. This guide covers both, plus the building regs position. For a figure tailored to your own garage, use our roof cost calculator.

Garage roof costs (2026)

These figures match our flat roof cost guide, which compares felt, EPDM and GRP in full. A double garage does not cost double a single: access is set up once and the crew is already there, which is where the roughly 1.8x rule comes from.

Which material for a garage roof?

For most garages, EPDM rubber is the sweet spot: it costs a few hundred pounds more than felt but lasts far longer, comes in a single seamless sheet at garage sizes, and needs no flame to install. Felt at £1,400 to £2,000 fitted remains the budget route and is fine where upfront cost rules. GRP fibreglass earns its premium when the roof works for a living: used as a terrace, walked on to reach windows, or over a workshop where a rigid, tough surface pays off, because GRP handles foot traffic better than either alternative. Pitched garage roofs are simply small tiling jobs and are re-tiled like the main house. A specialist garage roofing service will price all the options against your actual roof.

The asbestos cement issue

If your garage was built before the 1990s and has corrugated grey cement sheets on top, treat them as asbestos cement until proven otherwise: it was the standard garage roof of the era. Left alone and intact it is low risk, but never break, drill, cut or pressure-wash it, because damage is what releases the fibres. Removal and disposal must be done by a licensed contractor, which is why the asbestos line in the table runs £1,500 to £3,500 including replacement. Read the asbestos roof guide before getting quotes, and make sure any quote states the disposal route in writing.

Do you need building regs approval?

Usually not for a detached garage: freestanding garages under 30m² are generally exempt from building regulations, and that covers most single and many double garages. An attached garage is different, because it counts as part of the house, so re-roofing it follows the same rules as the main roof. The building regulations guide explains where the lines sit and who signs what off.