Garage Roof Replacement in Winchester: Felt, Asbestos Sheets, EPDM and Period Coach Houses

Most garage roofs in Winchester get ignored until water is pooling on the lawnmower. That's understandable, since nobody lives in a garage, but it means the roof usually fails long before anyone looks at it. A mineral felt flat roof on a 1970s single garage in Badger Farm or Harestock was probably designed to last 10 to 20 years, and many of them are now on their second or third covering. Older garages, especially anything built before 2000, often have corrugated asbestos cement sheets, because asbestos wasn't fully banned in the UK until 1999. Winchester gets roughly 780 to 820mm of rain a year, a little under the UK average but spread over plenty of grey, damp days, and that's exactly the weather that finds a split in a felt roof. As a rough guide, garage roof replacement in Winchester costs £1,000 to £2,500 for a standard single flat-roofed garage in 2026, and more if asbestos or a period outbuilding is involved.

What Kind of Garage Roof Have You Got in Winchester?

Before you can price the job, you need to know what's up there. In and around Winchester there are four main types, and they map fairly closely onto when the garage was built:

• Flat felt roofs on concrete-block or brick garages, mostly 1960s to 1990s. Very common on estate housing in Stanmore, Weeke, Harestock and Badger Farm.
• Corrugated asbestos cement sheets, usually grey and slightly furry with lichen, on prefabricated concrete garages and lean-tos from the 1950s to the late 1990s.
• Pitched tiled roofs on brick garages built to match the house, more typical of 1930s semis and newer developments.
• Period coach houses and outbuildings, with clay tile or slate roofs, behind Victorian and Georgian houses in St Cross, Hyde and the city centre.

If you're not sure which you have, or whether it's worth repairing rather than replacing, the team at Roof Repairs Winchester can look it over and tell you straight. A quick visual check from a stepladder (without climbing onto the roof itself) is enough for most people to tell felt from sheeting from tiles.

Flat Felt Garage Roof Replacement in Winchester

Felt is where most garage roof replacement work in Winchester starts. Older built-up felt roofs were laid in two or three layers over chipboard or softwood boards, and they fail in predictable ways: blisters, cracks along the joins, felt pulling away at the edges, and ponding where the deck has sagged. Once the boards underneath get wet, they swell and go soft, and at that point a patch won't hold.

Why the deck matters as much as the covering

On a lot of older garages the decking needs replacing too, not just the felt. Chipboard decks from the 1970s and 1980s lose strength fast once water gets in. A new 18mm OSB3 deck adds around £20 to £35 per square metre to the job, which on a typical 15 square metre single garage is £300 to £525. Pay it. A new membrane laid on a rotten deck will fail early regardless of how good it is.

Repair or replace?

If the felt is under 10 years old and the problem is a single split or a lifted edge, a repair at £150 to £350 is sensible. If it's 15 years or older, has more than two or three problem areas, or the deck feels spongy underfoot, replacement is better value. Winchester's damp autumns and the frost that settles in the Itchen valley put a lot of expansion and contraction through a flat roof, and old felt gets brittle in the cold.

Asbestos Cement Garage Roofs: The HSE Rules in Plain English

Corrugated asbestos cement (AC) sheets typically contain around 10 to 15% asbestos fibres bound into cement. While the sheets are intact and left alone, the risk is low. The danger comes from breaking, drilling, sanding, jet-washing or cutting them, which releases fibres.

Testing comes first

Don't assume a grey corrugated roof is asbestos, and don't assume it isn't. A sample analysed by an accredited lab usually costs £30 to £80, or £150 to £250 if you have a surveyor take it and write up a short report. Many garages in Winchester from the 1980s and 1990s used fibre cement sheets that look almost identical but contain no asbestos, and a test can save you hundreds of pounds in specialist removal.

Who can remove it?

Asbestos cement is usually classed as non-licensed work under the Control of Asbestos Regulations 2012, meaning a licensed contractor isn't legally required for AC sheets in good condition. That doesn't mean anyone can tear it down. The HSE's step-by-step guidance on removing asbestos cement sheets sets out the method: wet the sheets, unbolt rather than break them, lower them whole, double-wrap them in heavy polythene and never walk on the roof itself. If the sheets are badly damaged or crumbling, the HSE's guidance on licensed and non-licensed asbestos work explains when the job moves into a different category.

In practice, most homeowners use a roofer with asbestos awareness training and the right waste carrier registration, or a dedicated asbestos removal firm. And people forget the other risk: AC sheets won't take your weight, and falls through fragile roofs injure people every year. This is not a weekend DIY job.

Disposal and costs

Asbestos waste has to go to a site licensed to take it. Some Hampshire household waste recycling centres accept small amounts of bagged asbestos from householders by arrangement, but limits are tight and a whole garage roof is usually well over the allowance. Expect these figures for a single garage of around 15 to 18 square metres:

• Asbestos test: £30 to £250 depending on whether you need a report
• Removal and disposal of AC sheets: £600 to £1,200
• New roof covering after removal: £800 to £2,000 depending on the material
• Full job, test to new roof: roughly £1,500 to £3,200

EPDM, GRP or New Felt for a Winchester Garage Roof?

Once the old roof is off, the choice of new covering decides how long you'll wait before doing this again. We've compared these three materials in more depth in our guide to flat roof replacement costs in Winchester for EPDM, GRP and felt, but the garage version of the decision is simpler because you usually aren't heating the space.

EPDM rubber

A single sheet of synthetic rubber, with no seams on a garage-sized roof. It copes well with frost and UV and is typically guaranteed for 20 years or more, with a realistic lifespan of 30 to 50. For a single garage, expect £1,200 to £2,200 including a new deck. It's what we fit on most Winchester garages now, mainly because it's hard to beat on cost over 30 years.

GRP fibreglass

Glass-reinforced polyester laid wet and finished with a hard top coat. It's tough enough to walk on and lasts 25 to 30 years or more. It has to be laid in dry weather above about 5°C, which in Winchester can mean waiting a week or two in November or March. Budget £1,400 to £2,600.

Torch-on felt

Modern torch-on felt is far better than the old built-up felt, with a lifespan of 15 to 25 years. It's the cheapest option at £1,000 to £1,800, but it involves naked flames, which some insurers and homeowners prefer to avoid near a timber-framed garage full of paint tins.

Pitched Garage Roofs and Period Coach Houses in Conservation Areas

Pitched garage roofs are a different job. A brick garage with a concrete-tiled pitched roof can usually be stripped and re-tiled for £3,000 to £6,000, depending on size and whether the timbers need work. Re-using sound tiles brings the cost down.

Coach houses and historic outbuildings

Winchester has a lot of older outbuildings: Victorian coach houses, stables turned into garages, and brick and flint sheds along the backs of terraces in Hyde and Fulflood. These often have handmade clay tiles or Welsh slate, lime mortar and timber that's been there for 150 years. Replacing like-for-like is the norm, and reclaimed clay tiles can cost £1 to £2.50 each. A full re-roof of a coach house can run from £6,000 to £15,000 or more.

Planning and consent

Repairing or re-covering an existing garage roof in matching materials doesn't usually need planning permission. Changing the materials or the shape might. In a conservation area, outbuildings and changes to them are more tightly controlled, and the Planning Portal's guide to outbuildings and permitted development is a good starting point for what's allowed. If the main house is listed, a coach house in its grounds may be covered by that listing too, and swapping clay tiles for concrete or slate for felt would need listed building consent. Check with Winchester City Council before any work starts, not after.

Building Regulations and Insulation for Garage Roofs

A detached garage under 30 square metres with no sleeping accommodation is generally exempt from Building Regulations, so a straight replacement of its roof doesn't need sign-off. An attached or integral garage is different, especially if it's used as a gym, office or workshop. Replacing more than 25% of the roof on a heated space can trigger the requirement to upgrade insulation.

If you're thinking about converting the garage within the next five years, it's worth building a warm roof now. Adding 100 to 150mm of PIR insulation under the new membrane typically costs another £35 to £60 per square metre, but it's far cheaper than taking the roof off a second time.

Two practical points that come up on Winchester garages:

• Integral garages under a bedroom need to keep their fire separation, so don't let anyone cut through a ceiling without checking.
• Garages in the chalk areas north and west of the city can have soakaways that have silted up, so a new roof with new guttering should drain somewhere that actually takes the water.

Garage Roof Replacement Costs in Winchester: 2026 Summary

Typical 2026 prices for a single garage of about 15 square metres, including labour and VAT, look like this. Double garages are usually 1.6 to 1.8 times these figures rather than double, because setting up and access costs stay roughly the same.

• Felt repair (small area): £150 to £350
• New torch-on felt roof: £1,000 to £1,800
• New EPDM rubber roof: £1,200 to £2,200
• New GRP fibreglass roof: £1,400 to £2,600
• Asbestos sheet removal and disposal: £600 to £1,200 on top
• Pitched concrete tile re-roof: £3,000 to £6,000
• Period coach house re-roof in clay or slate: £6,000 to £15,000+

Skilled roofers in Winchester are busy, particularly between September and March after the first big autumn storms. Lead times of 3 to 6 weeks are common, and specialist heritage roofers can be booked further ahead. If your garage roof is on its last legs, getting quotes in late summer is the easiest way to avoid a winter of buckets.

Common Questions About Garage Roof Replacement in Winchester

How do I know if my garage roof contains asbestos?

You can't tell by eye. If the garage was built before 2000 and has grey corrugated or flat cement sheets, get a sample tested by an accredited lab. It usually costs £30 to £80 and gives you a clear answer.

Can I remove an asbestos garage roof myself?

The law doesn't always forbid it for sheets in good condition, but the HSE sets out a strict method and the fall risk is serious. Most homeowners are better off paying a trained contractor, who will also handle the legal disposal.

What's the best material for a flat garage roof in Winchester?

For most garages, EPDM offers the best balance of price and lifespan, at around £1,200 to £2,200 for a single garage and 30 years or more of service. GRP is a good alternative if you want a hard surface you can walk on.

Do I need planning permission to replace my garage roof in a conservation area?

Not usually for like-for-like repairs or replacement. Changing materials, roof shape or height may need permission in a conservation area, and outbuildings linked to listed buildings may need listed building consent. Check with Winchester City Council first.

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