Perth at a glance
- Postcode districts
- PH1
- Population
- about 47,350 (GeoNames)
- Council area
- Perth and Kinross Council
- Building approval
- Perth and Kinross Council building standards
- Nearest main town
- Dundee, about 18 miles
- Guide price region
- Scotland (−5% on West Midlands rates)
Why choose a green roof in Perth?
In a place like Perth, many people look out over a flat extension or garage roof from upstairs. Grey felt or rubber isn't much of a view, and a sedum roof turns it into something green that changes colour through the seasons and flowers in summer.
In a town like Perth, flat roofs are commonly found on lock-up garage blocks on estates or 1930s semis with flat-roofed garages and kitchen extensions. Scotland averages roughly 1,570 mm of rain a year, with the west far wetter than the east, so drainage, falls and wind uplift are part of every specification we write.
How much does a green roof cost in Perth?
Guide price in Perth: £4,200–£7,700 for a 20 m² insulated extension roof finished as a sedum green roof, including VAT at Scotland rates. The fixed price comes after a free survey for new and replacement roofs.
| Job | Guide price inc VAT |
|---|---|
| Extension (20 m²), EPDM with sedum green roof | £4,200–£7,700 |
| Extension (20 m²), EPDM, new deck + insulation | £2,650–£4,650 |
Can a green roof go on my existing flat roof?
Only if the existing waterproofing is sound, root-resistant or protected by a root barrier, and has plenty of life left. In most cases it makes more sense to lay a green roof as part of a replacement.
Once the sedum, substrate and drainage layers are down, the membrane underneath is hard to inspect and expensive to repair, because the green layers have to be lifted to get to it. Putting a green roof on an ageing covering risks paying for the greenery twice. Our repair or replace guide helps you judge whether your current roof is a sensible base.
As for planning, re-covering a house roof normally needs no application if its appearance doesn't change materially. Because a green roof does change how a roof looks, check with your council, especially for listed buildings, conservation areas and roofs that are easily seen. The planning guide has more.
What's included?
- Structural check of joists, deck and supports
- Warm or inverted build-up to suit the roof
- Drainage layer, filter and lightweight growing medium
- Root-resistant membrane or separate root barrier
Building standards in Scotland
In Scotland the building standards technical handbooks (Section 6 for energy) apply, and the council's building standards service decides whether a building warrant is needed. Like-for-like repairs to a roof covering can be exempt; alterations, structural work and new roofs usually need a warrant before work starts. The domestic roof benchmark is 0.12 W/m²K, applied as far as reasonably practicable on an existing roof. More on the rules.
Which nearby areas do we also cover?
- Blairgowrie and Rattray · 14 mi
- Crieff · 16 mi
- Cupar · 17 mi
- Glenrothes · 17 mi
- Dundee · 18 mi
- Cowdenbeath · 20 mi
Green and sedum roofs in Perth: questions
Do you cover Perth?
Yes. Perth is part of our Perth and Kinross coverage, including postcode districts PH1. Surveys and roofs are carried out by vetted roofing teams working under S&K Property Investments and Improvement Ltd.
Who checks building standards for a flat roof in Perth?
Where the work needs approval it goes to Perth and Kinross Council building standards. 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 green roof cost in Perth?
£4,200–£7,700 for a 20 m² insulated extension roof finished as a sedum green roof, at Scotland guide rates including VAT. The fixed price comes after a free survey for new and replacement roofs.
Can a green roof have a rooflight in it?
Yes. The rooflight sits on a raised upstand with a gravel strip around it, so the planting stays clear of the glazing and the upstand stays visible and dry.
Can you put a sedum roof on a garage?
Often, yes, if the structure is strong enough. Many older garage roofs have light timbers, so a structural check comes first and strengthening may be needed.