Roof Replacement Cost Guide for Flat Roofs, Garage Roofs and More

Related Guides: Roof Tiles Prices, New Roof Cost Guide

Whether you need a new pitched, flat or garage roof, you’ll need to make sure that you hire a qualified professional to replace your roof for you.  Find out how much you can expect to pay for your roof replacement here.

How much does it Cost to Re-Roof a House?

The cost of replacing a garage roof or house roof will depend on several factors that include the material you choose, size of roof and other costs.

  • Materials for your roof can be made from slate, concrete, clay or metal sheeting all of which are differently priced

  • Scaffolding hire needs to be added to the cost of roofing now as per government regulations

  • Roof size affects the amount of roofing product you will need and affects the time it takes to install

  • Cost of labour will be added to the roofing material for the time it takes a professional roofer to replace the roof. Building Sheriff says the average cost of hiring a roofer for one day starts at £150

  • Any additional roof work such as fascias, chimneys and guttering will also need to be added to the cost of replacing a flat garage roof

All of these factors make it difficult to work out the cost to re-roof but some examples from are as follows:

  • To replace the roof on a three bedroom semi-detached house starts at around £3500

  • To replace the roof on a four bedroom semi-detached house starts at around £5600

This price includes supply of roofing materials, scaffolding and fitting of roofing materials.

Flat Roof Replacement Cost

The cost of replacing a flat garage roof or flat house roof will depend on the size of the roof and the material that you choose. Quite often flat roofs are made up of layers of felt and waterproof material such as uPVC and rubber. Permaroof is an example of a flat roof membrane that is bought by the metre.

  • A metre of Permaroof  that is 1.14mm thick is around £7

  • A metre of Permaroof  that is 1.52mm thick is around £8.50

A rough idea for a flat roof replacement cost in Permaroof that is:

  • 3m x 6m is between £1100 and £2200

  • 3.5m x 7m is between £2000 and £3600

  • A flat roof kit is around £450

The less expensive price will include removing the old roof and replacing with a new flat roof plus edges and trims whereas the more expensive price includes roof insulation, fascias and soffits.

Garage Roof Replacement Cost

As garage roofs are normally flat, the cost is worked out the same as a houses roof but of course the size is smaller. Permaroof give an estimate of between £ 1600 and £3000.

Roof Cleaning Prices & Cost Guide

Plant growths such as moss and algae can build up on your roof and can cause tiles to crack and come loose. If this occurs you will need to repair or possibly replace the roof. Flat roof repair costs by a professional roof repair and cleaning service can cost up to £1200 for a days’ work. Of course the ultimate price will depend on who you hire and the size of your roof.

Get more roof cleaning prices.

*Sources:,, Permaroof

david wheeler says:

flat roof needing replacement (the whole lot needs stripping off and starting with new boards and felt), it is about 30sq m covering garage and lean-to, at the side of the house. How much will this be roughly – I am in NG9

Award Flat Roofing says:

Depending on the flat roof covering you choose, you should expect to pay £1500 – £3000. Cheaper felt will last around 10 years, more expensive GRP will see 50+ years. This price should include stripping and removing the perished roof, but don’t forget about the fascias and guttering… Please contact me if you require further info.

Heidi Williamson says:

I have 42sq metres of flat roof.. Would like to have a rough cost of replacing existing boarding, insulating just over half of it and then covering with EPDM or felt.
Thank you

sdeshmukh says:

Hi Heidi,
To get a rough cost of your project, fill in this form and get no-obligation quotes from our approved roofing contractors.

Claire Marie says:

I have a flat roof 3m x 4.5m. It needs to be replaced, preferably not with a flat roof and with 2 skylights. How much should I be looking to have to spend?

samrat says:

Hi Claire,
Price will depend on the size of project and location. So if you are looking for free no-obligation quotes then please fill out this roofing form and UP TO 4 tradespeople will get in touch with you.

john buckley says:

I have flat corrigated garage roof 16ftx8ft that is rusty and needs replaced and maybe raised up a foot,i live in blackpool fy29lg

samrat says:

Hi John,
Please fill this roofing form and you will be contacted by up to 4 roofing contractors to provide you with no-obligation free quotes.

jonny carmichael says:

Hi there I need to take off the tiles from roof, insulate, felt, batten, and put tiles back on.i have sorted scaffolding. How much would this cost roughly

mjackson says:

Hi Jonny,

Thanks for your post.

We would suggest getting quotes from local insulation specialists as prices can vary, depending on multiple factors.

You can request quotes by filling in our online roof insulation form and we will aim to match your details with up to 4 companies who will each contact you in order to arrange a free visit.

Thanks again.


Tricia says:

I’m getting my single garage flat roof done on Monday in fibreglass which lasts 20 years+ for £1100

mjackson says:

Hi Tricia,

Thanks for your post – this information will give readers an idea of what to expect when looking for prices for similar work.

We wish you all the best with your new garage roof.

Mark @ Servicemagic

dempsey says:

just had flat roof treated with CROMAPOL guaranteed for 10 years,roof size 4×3 m2 cost £490 aintree.

mjackson says:

Hi Dempsey,
Thanks for your comment and additional information.

Mhol says:

About 10 years ago my garage roof was recovered with corrugated concrete type sheets, but the middle part has clear flat sheets to give light. The edges of this were just taped to the corrugated sheeting, and now its all coming off. But there are leaks in the corrugated sheeting in other places too. The company who did it have gone out of business, so their 15 year guarantee was worthless. It`s a bigger garage than normal, as it doubles as a garden shed too.

mjackson says:


If you are in need of quotes to repair the roof, you would need to complete our request form by clicking this link .

We will then aim to match your request with up to 4 local tradesman who will contact you in order to make arrangements to view the job and offer the free quote.

John Hanna says:

Im looking in belfast area the cheapest price for covering felt foof it is 6feetx4feet

mjackson says:

Hi John,

Thanks for your post.

Please feel free to fill in our online request form and we will aim to match you with up to 4 local contractors who will call you in order to arrange a convenient time for them to visit you and provide you with a free quote.

Phyllis Butts says:

My garage is an older concrete building leaking from the back ceiling, I need to know if damage can be repaired or if the roof need to be replaced

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