Derry/Londonderry at a glance
- Postcode districts
- BT48
- Population
- about 87,153 (GeoNames)
- Council area
- Derry City and Strabane District Council
- Building approval
- Derry City and Strabane District Council building control
- Guide price region
- Northern Ireland (−12% on West Midlands rates)
When does a garage roof in Derry/Londonderry need replacing?
Garage roofs in Derry/Londonderry are often replaced when the deck gives way. Chipboard decks swell and soften once they get wet, and you may see sagging between joists or feel the roof flex underfoot. Replacing the deck and covering together is usually more economical than repeated repairs.
In and around Derry/Londonderry, flat roofs are typically found on 1930s semis with flat-roofed garages and kitchen extensions, and on shops with flat-roofed rear stores below flats. Northern Ireland averages roughly 1,150 mm of rain a year, spread over many wet days, so a roof that sheds water quickly to clear outlets lasts far longer than one that holds puddles.
How much does a new garage roof cost in Derry/Londonderry?
At Northern Ireland guide rates, a typical 18 m² garage roof in EPDM comes to £1,400–£2,450 including VAT. The fixed price comes after a free survey for new and replacement roofs.
| Job | Guide price inc VAT |
|---|---|
| Single garage (18 m²), EPDM rubber | £1,400–£2,450 |
| Single garage (18 m²), torch-on felt | £1,350–£2,300 |
| Single garage (18 m²), GRP fibreglass | £1,550–£2,850 |
| Extension (20 m²), GRP, new deck + insulation | £2,650–£4,750 |
What if my garage roof is asbestos cement or old felt?
If your garage has corrugated cement sheets, especially on a pre-2000 building, assume they could contain asbestos until a test says otherwise. We do not remove asbestos; any suspected material is tested and, if confirmed, removed by a licensed specialist before our work starts.
Once the old sheets have gone, the garage usually needs new timber joists or purlins and a deck before a membrane can go on. Old felt garages are more straightforward: the felt is stripped and the deck assessed in the usual way.
Lock-up blocks and rows of garages bring their own issues. A shared roof often has several owners, so we can quote per bay, or for the whole run where everyone agrees, which keeps the edges and joins between garages consistent. Attached garages need careful upstands and flashings where the roof meets the house wall, while detached ones are about edges, gutters and falls.
Not sure whether your roof needs replacing? Our guide to repair or replace sets out the signs.
What's included?
- Gutter or outlet renewed where the old one has failed
- Written workmanship guarantee, with material guarantees registered where available
- New membrane dressed into fresh edge and drip trims
- Free survey of the deck, fall and gutter line
Building control in Northern Ireland
In Northern Ireland, Technical Booklet F1 sets roof insulation at 0.18 W/m²K when a roof over a heated room is renovated or newly built, where that's feasible. The district council's building control should be contacted before work starts, and we prepare the details it asks for. More on the rules.
Which nearby areas do we also cover?
Garage roofs in Derry/Londonderry: questions
Do you cover Derry/Londonderry?
Yes. Derry/Londonderry is part of our County Londonderry coverage, including postcode districts BT48. Surveys and roofs are carried out by vetted roofing teams working under S&K Property Investments and Improvement Ltd.
Who checks building regulations for a flat roof in Derry/Londonderry?
Where the work needs approval it goes to Derry City and Strabane District Council building control. We tell you at the survey whether your job needs it and deal with the paperwork as part of the quote.
How much does a new garage roof cost in Derry/Londonderry?
£1,400–£2,450 for a typical 18 m² garage roof in EPDM, at Northern Ireland guide rates including VAT. The fixed price comes after a free survey for new and replacement roofs.
Is it worth repairing a garage roof instead?
If the roof is generally sound and dry with one isolated defect, a repair is usually sensible. Widespread cracking, a soft deck or repeat leaks point to replacement.
Can you put a new roof on a garage with a cement sheet roof?
Yes, once any suspected asbestos has been tested and removed by a licensed specialist. The garage then usually needs new timbers and a deck before the new membrane goes on.