How are roofing costs estimated?

General Tips

The roof is one of the biggest investments you'll make in your home. Find out how the costs of installation of a new roof and repairs on existing roofs are determined.

Size: Roofers will calculate the exact size and dimensions of your roof to best estimate the amount of materials needed.

Slope of your roof: The steeper your roof is, the more materials will be needed to cover it.

Materials: The price for materials will depend on what kind of roofing materials you choose to have installed.

Roof access: If your roof is difficult to access, or if it is multiple stories, contractors may charge more.

Difficulty level: If your project is complex - for example, if you have chimneys, skylights and vents that roofers need to work around - the higher the cost could be.

Location: Where you live could determine your estimate.

See this article here & credit goes to http://www.news8000.com/lifestyle/how-are-roofing-costs-estimated/221573408

local.which.co.uk contacted Which? Local-recommended traders to find out how much standard jobs should cost and how quickly they should be completed. Armed with this information, you’ll feel confident about hiring traders and be better equipped to spot when things aren't right.

local.which.co.uk surveyed recommended roofers to find out how much you should spend on 13 common jobs and how long they should take to complete.

Trader tip: scaffolding

If extensive work is taking place on a property above one storey high then it’s likely that scaffolding will be required.

Scaffolding is expensive, and takes hours to put up and take down. This will increase the price of quotes.

Research methodology

In July 2012, we sent a survey to all Which? Local traders in the Roofers category with a rating of three stars or more and an email address.

20 roofing professionals responded to the survey. Using their experience and expertise, they answered questions about the cost of popular roofing jobs, and how long they should take to complete.

JobDetailsTypical price quotedPrice rangeTypical time to complete job
Survey conducted in July 2012
Replace fascias and soffits on a typical three-bed detached bungalowRemove wooden fascias and soffits. Replace with uVPC. Includes cost of labour and materials. Assuming no scaffolding needed.£1,900£1,250-£2,2252–5 days
Replace fascias and soffits on a typical three-bed detached, two-storey houseRemove wooden fascias and soffits. Replace with uVPC. Includes cost of labour, materials and scaffolding.£2,425£1,625-£3,0002–5 days
Replace lead flashing on chimneyn/a£340£300-£4501 day
Fix leaking roof on a two-bed bungalowReplace approx six roof tiles.n/a£80-£1891-3 hours
Fix leaking roof on three-bed, semi-detached, two storey houseReplace approx six roof tiles.n/a£88-£2001–3 hours
Replace whole roof on a two-bed bungalow – plain tilesRemove existing tiles, fit new plain tiles. Includes cost of labour, materials and scaffolding.£4,500£3,850-£5,8754-6 days
Replace whole roof on a three-bed, semi-detached, two-storey house – plain tilesRemove existing tiles, fit new plain tiles. Includes cost of labour and materials.£5,600£4,500-£7,0006–10 days
Replace whole roof on a four-bed, detached, two-storey house – plain tilesRemove existing tiles, fit new plain tiles. Includes cost of labour and materials.£6,750£5,500-£8,75010–14 days
Replace whole roof on a two-bed bungalow - slateRemove existing slate and replace with new.£4,800£4,000-£6,0005–10 days
Replace whole roof on a three-bed, semi-detached, two-storey house – slateRemove existing slate and replace with new.£6,250£5,000-£7,5008–12 days
Replace whole roof on a four-bed, detached, two-storey house – slateRemove existing slate and replace with new.£8,250£6,500-£12,00010–20 days
Flat roof on typical single garagePut a flat roof on existing single garage - rubber membrane.£900£840-£1,1501 day
Flat roof on conservatoryPut a flat roof on a conservatory measuring approx 10'10” x   

This has been taken from https://local.which.co.uk/advice/cost-price-information-roofers-roofing-jobs

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