How Much Does a Rubber Flat Roof Cost?

Updated EPDM Roof Prices For 2021

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A Look at Rubber Flat Roof Prices

Flat roofs, whether on garages, porches or other parts of a property, are prone to leaks and one of the best roof coverings to keep your home dry is rubber EPDM.

Rubber roofing products last for decades with some manufacturers offering impressive 25-year warranties. In our opinion, rubber felt should if installed correctly, last much longer than traditional bitumen flat roof felts and is comparable to fibreglass roofs.

There is one downside to rubber flat roofs – the material should ideally be laid onto new timber decking, and this adds to the cost of the project.

If you want to know how much a typical rubber flat roof costs, explore our price guide below, which is based on quotes from roofing firms in the UK.

We can also help you source a price online for your flat roof replacement project.

We Asked 34 Roofing Firms How Much They Charge For a New Rubber Flat Roof

See how much we think a new rubber flat roof will cost

Here’s a Typical Works Schedule For a New Rubber Flat Roof

This schedule is based on the written prices given to us by the 34 roofing firms:

  • Erect access equipment to the desired work height.
  • Remove the existing flat roof covering.
  • Inspect the existing timber decking boards.
  • If the decking is sound, overlay new OSB decking so there’s a new, clean surface for the rubber to adhere to.
  • If the decking has sagged, is rotten, wet or in generally poor condition, replace with new OSB decking boards.
  • Install the rubber EPDM membrane to the decking with adhesive.
  • Install black metal edging trims as required.
  • Lower access equipment and remove all waste material.
Rubber roof kit

Photo shows all the items needed for a small porch installation. Image source.

Rubber Flat Roof Cost 1 – Single Garage

For this project, we asked the roofing firms for a price to replace the covering on a single garage roof with rubber EPDM.

The prices shown below are an average of the figures given to us and crucially, include the cost of new 18mm OSB decking.

If the decking on your roof is on good condition, you can lay decking over the top of it, rather than replacing it; this would work out cheaper.

Location:From:To:
London Area£1700£1800
South, SW and Midlands£1400£1500
Outer Region and North£1200£1300
Need a Custom Price?Get a Quote

EPDM Flat Roof Example 2 – A Double Garage

The prices below are for a double garage, and as with the first price example, they include the cost of replacement 18mm OSB decking.

This is how much we think a project like this will cost, based on an average of the figures given to us:

Location:From:To:
London Area£2800£3000
South, SW and Midlands£2500£2700
Outer Region and North£2100£2300
Need a Custom Price?Get a Quote

Rubber Roof Cost Guide 3 – A Small Porch

We also sourced prices for a small porch.

Again, the price includes the installation of rubber EPDM and also new decking. 

The figures below are an average of the prices given to us.

Location:From:To:
London Area£800£900
South, SW and Midlands£800£900
Outer Region and North£600£750
Need a Custom Price?Get a Quote

A Note About Decking

The life expectancy of any flat roof covering isn’t just determined by the material or the quality of the workmanship but also by the decking that supports the felt.

OSB decking for rubber roofs

OSB Decking is extremely strong, layers of wood are glued together not randomly but to a specific pattern for maximum strength.

Traditional bitumen products can be torched onto old decking boards. However, both rubber and fibreglass should ideally be laid onto new OSB board decking, which obviously adds to the cost of these projects.

The good news is that if the decking boards on your roof are in good condition and aren’t wet, rotten or sagging, they can be left in place and new boards laid over the top of them. This method can reduce the price of the project as removing and disposing of old decking boards is costly.

While some roofers may recommend installing the rubber over old decking boards, we suggest you make sure they are in a good enough condition. Rubber flat roof membranes should not be laid over bitumen or bitumen residue that’s leftover from previous coverings.

For flat roofs above heated parts of your home (i.e. not a garage or shed) you may need to pay for insulation so the project meets the Building Regulations (Part L) for flat roof thermal efficiency. One option is to install insulated decking:

Insulated decking

Insulated decking – perfect for roofs above heated parts of the property and meets Building Regulations Part L but costs more.

A good flat roofer, such as one from our recommended partner, should be able to explain what type of decking you’ll need after inspecting the roof.

Other Costs to Consider

Insulation: Garages and unheated porches don’t require insulation but a flat roof located above a habitable part of the property will need it. The Building Regulations for roof insulation (Part L) explain in more detail how much insulation is needed but for most flat roofs above heated parts of the property, you’ll have to pay for a top-up of insulation. We haven’t included this cost in our guide as the type, quantity and price varies from project to project. Need more information? Our guide to flat roof insulation is a good place to start.

Access: Our prices are for porches and garages, which are easy to access. If your roof is located in a difficult-to-access part of the roof, perhaps 3-storeys high or in another area that can’t be reached easily with a ladder then other, more expensive access equipment, such as scaffolding might be needed.

Optional Gravel/Stone Finish: Rubber roofs aren’t the prettiest roofs, and some people dislike the finish. As an optional extra, gravel or stones can be laid on the roof for aesthetic purposes. This will cost more, and we haven’t considered this in our flat roof price guides.

VAT: The 34 roofing firms that we contacted for prices were an even mixture of larger firms that are VAT registered and smaller businesses and sole traders that are operating below the VAT threshold and don’t need to charge this tax. Our prices are an average of the figures and include VAT where charged.

Extras: Most flat roofs will have guttering, fascias and sometimes soffits at the edges. We haven’t included a cost to replace these with Upvc plastic or to paint them. You may want to consider this extra work.

Get Your Custom Rubber Flat Roof Price

Our rubber flat roof price guides are calculated on figures given to us by firms and sole traders in the UK, but every project is different.

To get a custom price for your replacement roof project, tap the button below and fill in the contact form:

  • Get a rubber flat roof price quickly online.
  • Read vetted ratings and reviews.
  • Compare the prices from three flat roofing firms.

Rubber Flat Roof Replacement

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Flat Roof Replacement FAQs

What is The Best Flat Roof Covering Material?

Rubber has become very popular over the last decade or so and is one of the longest-lasting materials. It can be expensive though, especially when new decking is required and one should be careful not to contaminate it with oils, solvents or residues from old bitumen roofing materials.

Fibreglass is a hard, tough material that lasts for decades but is prone to cracking when used on very large roofs where there’s movement of the structure underneath.

Bitumen-based flat roof felts have been around for decades and are one of the oldest and time-tested materials. It’s cheaper than rubber but doesn’t last as long and is more easily damaged by weathering and sunlight. Also, bitumen must be heated with a gas-powered torch which introduces a fire risk.

When Were These Rubber Flat Prices Updated?

We gathered these prices in 2020 and published this rubber roof price guide in October 2020. We don’t expect the prices to change much over the next year or so except for inflation.

How Long Will a Rubber EPDM Flat Roof Felt Last?

Most manufacturers offer warranties of between 10 and 30 years and rubber roofs installed 20 years ago are still holding up well. In our opinion, a rubber roof should outlast any other flat roof covering, including fibreglass.

Of course, the life expectancy of the roof will depend on the workmanship an the condition of the timber decking underneath it.

Where Did The Prices Come From?

34 roofing firms and tradespeople from around the UK provided us with prices for rubber flat roofs. We then calculated an average price and published this guide.

Do I Really Need New Decking?

EPDM rubber roofing products should only be laid over sound decking that isn’t contaminated with oils, solvents or residue from bitumen.

If the decking on your roof is sound and clean, you might be able to lay the rubber directly onto it.

The next option is to lay new decking over the top of the old one, this is only possible if the old decking isn’t sagging, wet, rotten or in poor condition. The third option is the most expensive; remove the old decking and fully replace it with new 18mm OSB decking. Each decking sheet covers 2.8 square metres, and each one costs around £45-55 to buy and fit.

My Existing Flat Roof is Pooling Water, Is This a problem?

Modern flat roof materials are designed to last years, even with water pooling on them.

However, in our opinion, you’ll get more mileage from your roof if most of the rainwater flows off of it rather than pooling on it.

Also, if your roof does spring a leak, it will be far worse if the roof is pooling considerable amounts of water.

If your existing flat roof is holding water in a few areas that have sagged, replacing the decking may solve the issue.

If the roof is designed so water is flowing in the wrong direction, then one end of the roof will need to be raised so the water flows towards the guttering or outlet. Raising a flat roof at one end isn’t as difficult as it may sound but new decking and some extra timbers will be required. This will obviously add to the overall cost.

If your existing flat roof is pooling water, contact a roofing specialist, make them aware of the issue and request a flat roof price that includes the cost for new firrings.

How Long Does it Take to Install a Rubber Flat Roof?

It will take a roofing firm just under a day to replace the decking and felt covering on a single garage. A double garage will take between one day and a day and a half.

 

Are There Any Associations Where I Can Find Vetted Flat Roofers?

Several roofing associations in the UK hold databases of approved roofers.

The National Federation of Roofing Contractors and the Confederation of Roofing Contractors are good places to start.

You can also use our network of tradespeople, and of course, there’s also Checkatrade, Which?, Trustmark and other general associations.

Discover More Price Guides:

By Quotation Check

Traditional Bitumen Flat Roofs

An alternative to rubber EPDM is traditional bitumen-based torch-on felts. They don’t last as long as rubber or fibreglass but are cheaper and in many cases still last for decades.

Fibreglass Flat Roofs

Fibreglass can be found on ships, kayaks, pond liners, cars and hundreds of other items that keep water out. It also makes for a very good flat roof covering. 

Roofing

Let us show you how much guttering and roofing projects cost in the UK. From repairs to maintenance to complete overhauls and replacements, check out our cost guides.

Their prices for roofline installations were correct; we were given quotes from several firms, all were similar to [Quotaton Check’s]

Quotation Check’s guides to flat roof prices are very accurate, they include all the extras many other price guides conveniently exclude.

Why only rely on three or four quotes for comparison? Quotation Check sourced prices from hundreds of firms for various home improvement tasks.

Roofing firms often charge more than they should because they think consumers have no idea about how much the parts and labour should cost. Quotation Check’s guides are easy to read and they explain in detail about the materials needed and how long the work will take.

If you want to know how much it costs to replace a flat roof with rubber felt, read the guide over at [Quotation Check].