Garage Roof Replacement and Repair in Dorking and Surrey

Garages, sheds, workshops and garden rooms: the roofs that get ignored until the tools go rusty. We repair what can be repaired and replace the rest in felt, GRP fibreglass or box-profile sheet, for a fixed written price.

15-year guarantee on flat roofsDorking and 20 km aroundFree quotes

Most garage roofs around Dorking and Reigate are either flat roofs in mineral felt that was last done in the 1990s, or old corrugated sheets, sometimes asbestos cement, that have cracked and let water in. Either way the symptoms are the same: a damp garage, rusting tools, and plasterboard or timber starting to rot in a garden room or workshop.

We replace flat garage roofs in torch-on felt or GRP fibreglass, with new decking and a proper fall so water runs off instead of sitting. Pitched garage roofs and outbuildings get new box-profile steel sheets, which are light, quick to fit and last for decades. We also repair garage roofs where the deck is sound, and we can insulate while the roof is off if you use the space.

What is included

  • Felt and GRP fibreglass flat roofs for garages and garden rooms
  • Box-profile sheet roofs for pitched garages, sheds and workshops
  • Rotten decking and firrings replaced, with a fall built in
  • Insulation added for garden offices and workshops
  • Repairs where the existing roof is sound
  • Old sheets and felt removed and disposed of
New box-profile sheet roof on an outbuilding
GRP flat roof on an extension between slate-hung walls

Signs your garage roof needs replacing

  • Water pooling on the roof or dripping inside after rain
  • Felt that is blistered, cracked or growing moss
  • Corrugated sheets that are cracked or lifting at the fixings
  • Daylight visible through the roof from inside
  • Soft, sagging boards
  • Rust on tools and damp on the walls inside
Felt flat roof being torched on

How much does a garage roof replacement cost?

A single garage in felt is one of the cheapest roofs there is to replace; GRP costs a little more and lasts longer, and a box-profile sheet roof on a pitched garage is similar. The price goes up if the deck or timbers need replacing or if the old roof is asbestos cement, which has to be removed and disposed of properly. We quote a fixed price in writing after a quick visit.

Repair or replace?

A patch on a sound felt roof is worth doing if the leak is in one spot and the boards are dry. If the felt is tired across the roof, the boards are soft or the sheets are cracked in several places, replacing the whole thing is cheaper than a string of patches, and it comes with our 15-year flat roof guarantee.

Garage & Outbuilding Roofs across Surrey.

We cover about 20 km around Dorking. Click a town for its own page.

What customers say.

5.0from 129 reviews on Bark
The roof on our extension had been leaking for months. They inspected, explained the issue, and handled the repair brilliantly.
Connor LongExtension roof leak · Jul 2025
Bark
New gutters and fascia were fitted perfectly. No drips or leaks anymore. Very happy!
Liam ShawGutters and fascias · Jul 2025
Bark
William responded to my request on Bark to replace a slate tile within minutes, and was able to do the work the same day, good job, fair price and nice guy.
Jason TuttySlate repair · Jan 2025
Bark
Had a new roof installed last week. Very professional job from start to finish. Everything feels solid and looks great from the street.
Jude DickinsonNew roof · Jul 2025
Bark

Good questions, answered.

Anything else, just ask. You speak to Will or Sam, not a call centre.

Can you remove an asbestos garage roof?

We can advise and arrange safe removal and disposal of asbestos cement sheets by a licensed contractor, then fit the new roof. Tell us when you book the visit so we can plan for it.

Felt, GRP or sheet, which should I choose?

Felt is the cheapest for a flat garage roof, GRP lasts longest, and box-profile steel is the answer for a pitched garage or shed. We will tell you which suits the building and your budget.

How long does it take?

A single garage is usually done in a day, a double or a garden room with insulation in two.

Do you do shed and summerhouse roofs?

Yes. Felt, shingles or sheet, whatever the building needs.

Need garage & outbuilding roofs? Get a free quote.

Call Will and Sam or send a few details and we will come out, look at the roof properly and give you a fixed written quote.

Fully insured · 25-year guarantee on new roofs · Free, no obligation quotes
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