Flat roof Costs

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Flat roof

Flat roof

Flat roofs are horizontal or near horizontal and are otherwise known as low-pitch roofs. A waterproof material is used and water is allowed to run off the roof area at a slight inclination into a gutter system.

Although some flat surfaces won’t have a gutter system attached, they’re highly recommended and will keep the walls and foundations dry.

Benefits of flat roofing

Flat roof benefits are becoming more evident around the country. For those that invest in a flat roof, not only are they a space saver but the economical and efficient structure ensures both energy and money are saved too.

On top of this, flat roofs tend to last longer than the pitched tops and are also cheaper to have installed. They’re also resistant to UV rays and changing weather conditions, whilst they can be combined with almost any material.

With a flat roof:

  • Have a long lasting, weather and UV resistant surface

  • Save money on your energy bills with improved insulation

  • Benefit from a cheaper installation cost

  • Combine the structure with any material

Flat roofing quotes

Flat roofs prove to have a number of benefits for homeowners and commercial properties. If you’re interested in a flat roof for your building you’ve come to the right place.

Just complete our quick form and receive up to four FREE quotes from vetted, local and reputable professionals.

Average Flat roof cost

Average price per Flat roof job in 2021

Avg. price low

Avg. price low
£1,875

Avg. price

Avg. price
£2,500

Avg. price high

Avg. price high
£2,875

£3000

£2250

£1500

£750

£0

Flat roof installation cost in 2021

Labour cost £1,750
Material cost £625
Waste removal £125

Advantages for Flat roof

  • Keeps your roof safe from ingress of water
  • Choice of materials for the flat roof. Some materials offer longer warranties
  • Replacement of any damaged wood under the flat roof which could lead to more leaks in the future

Disadvantages for Flat roof

  • More costly than a repair
  • Takes longer than a repair to complete

Flat roof Manufacturers

Flat roof FAQs

How often do flat roofs need replacing

How Often Do Flat Roofs Need Replacing?

When a flat roof needs to be replaced is determined by a number of factors which includes the roof’s exposure to the weather, the condition and age of the roofing materials as well as the construction of the roof. However, with proper maintenance and regular inspection, they should be used for nothing less than 50 years. There are some commonly used types of flat roofs which includes Felt flat roof as well as a GRP flat roof.

Felt Flat Roof

The lifespan of a felt flat roof also varies depending on the quality and grade of the felt roof incorporated. This can make the roof last within the range of 2 to 20 years. More often than not, felt flat roofs are usually installed in such a way to keep the costs down which implies the grades of felts that are mostly used are the economical ones implying a very short lifespan.

In the event whereby a premium grade of felt is incorporated in constructing a roof by professional contractors, will be guaranteed by the manufacturer to last between 10 to 20 years.

One of the major causes of a short lifespan in felts is leaks which should be regularly inspected and repaired once identified. If not, the roof will gradually deteriorate and become a lot weaker due to the action of the sun. However, when a felt roof starts to leak, it’s usually a sign that’s approaching the end of its lifespan and a replacement should be taken into account.

GRP Flat Roof

The GRP flat roof or fibreglass flat roof usually comes with a manufacturer’s guarantee of 20 years and is expected to have a lifespan of a minimum of an additional 10 years.

Unlike felt roofs, they’re more resistant to leaks. However, they should also be regularly inspected for leaks which are caused mostly as a result of installation error rather than the GRP roofing approaching the end of its useful life. If the GRP roof repair does not totally resolve the leak, you should start considering a replacement.

What is overlaying?

If your existing roof is still in good condition but the membrane is getting old, it’s often not worth exposing the structure to the weather whilst the contractor strips off the old membranes. The contractor will leave them in place to act as a base layer for a new roofing system. As long as there are no other problems with your roof, then overlaying is a good way to replace your flat roof. If you have any more questions about flat roofing that aren’t listed here, fill out our form to ask a contractor.

How long should a flat roof last?

It depends on the material you use, but if your flat roof is installed correctly it should last for at least 10 years, and at least 20 if a material other than felt is used. Always question a roofing company when they quote to find out what materials they use and what guarantee's they offer.

How much is a new flat roof

How Much Is A New Flat Roof

What is a home without a roof to keep out the elements? Being the first line of defence against intense sun, rain, wind and more, implies they require enough care and attention to keep them in a top condition. Therefore, whether you need a new flat roof or just to replace some tiles, you’d be interested in knowing how much it would cost you to get a new roof before you start making the necessary plans. Here, we’ll give you an idea on the cost of a new flat roof and how you can estimate yours based on your unique requirements.

The size of your roof as well as the material to be used are the two main determinants of any flat roof project’s cost. For instance, a four bedroom detached home’s slate roof will be more expensive than a felted flat roof for a small or standard garage. Generally, in the UK, the average cost for replacing a flat roof will range between £5000 to £6000. However, if you’re on a tight budget and looking for the cheapest possible option, you’ll get a felt flat roof only on a garage at about £1000 to £1500. Meanwhile if you want to replace the entire slate tiles of a large family home, the cost can jump up to a range of £11000 to £13000.

Other factors that plays a key role in the determination of a new flat roof’s cost includes the location, labour as well as materials. For instance, a new flat roof price is likely to be higher in London and the south east than the other regions of the country. Also, labour may cost you around £150 to £250 per worker on a daily basis.

What is the average cost to replace a flat roof

What Is The Average Cost To Replace A Flat Roof?

Are you interested in knowing how much it costs to replace a flat roof? Here, you’ll discover a price breakdown for replacing flat roof. This includes a number of price determining factors such as materials costs as well as cost of labour and cost per square metre. All these enables you to make easy calculations so that you can determine a flat roof replacement estimate for your own project.

The type of flat roof that is the most common type is the garage roof and for the replacement of a single garage roof, the cost will fall between the range of £700 to £1000. Meanwhile for a double garage, you should expect a price increase of about 40 percent to 50 percent. The main price determinant that’s affecting the price of a new flat roof is the material incorporated in making it. For instance, lead or fibreglass are much more expensive when compared to felt roofs.

Generally, the cost of a flat roof replacement will fall within the range of £700 to £1300 varying largely due to the type of materials to be used by the roofer, the roof’s size as well as whether or not scaffolding would be used. Multiple flat roof applications also comes with different costs which includes:

• Felt roof ( £40 to £60 per square metre).

• Fibreglass roof ( £70to £90 per square metre ).

• Rubber roof ( £80 to £85 per square metre ).

• Lead bay roof ( £90 to £105 per square metre ).

• Fibreglass bay roof ( £40 to £60 per square metre ).

Several professional roofers work in pairs and to hire them you’re likely to be charged between £200 to £300 per day. The project can be completed with just a day’s work, but the installer should be back to make sure there are no leaks.

How to replace a flat roof

How To Replace A Flat Roof

Is it high time you replaced your flat roof with a new one? If it’s time, then you probably shouldn’t waste another minute! Flat roofs come with multiple upsides and happens to be a lot more affordable than many other options (especially for starters). Not only do they add to your home’s curb appeal and requires a relatively low labour costs as there are minimal risks involved, but they’re also more accessible for maintenance purposes and aren’t as exposed to damage as a pitched roof. However, we’re not here to discuss the various benefits of installing a flat roof, but rather tell you how to install one. If you lack proper training and experience, we’d recommend you hire a trustworthy professional that can guarantee the best results.

• Wipe the entire roof system clean.

• Detach and replace rotted roof sheathings.

• Detach and replace rotted fascia

• Hire a qualified air conditioning professional to disconnect the existing AC units.

• Introduce new aluminium air conditioning stands and secure against the deck.

• Let you qualified air conditioning professional reconnect the existing AC units.

• Put in place the new air conditioning quick disconnects.

• Attach EPS fanfold insulation in such a way to cover the surface of the entire roof and secure it firmly in place.

• Attach the tie-in roof materials where necessary.

• Attach roofing membrane to cover the entire area of the roofing.

• Attach membrane to the entire roof’s perimeter.

• Attach new perimeter flashings (fascia bar, fascia cap and drip edge), secured on the centre at 6”. Make use of a good sealant to secure the fascia bar or fascia cap’s top flange.

• Attach boots on plumbing seal and stacks.

• Identify the existing vent stacks and seal, and put curbs

• Put safety walk pad network from the access point of the roof to the air conditioning units.

• Attach rooftop signs for roof traffic personnel

• Tidy up and clear out the debris

How to replace flat roof felt

How To Replace Flat Roof Felt

Also referred to as tar paper, roofing felt is installed underneath the roof’s shingles to help deny water access to your home. Installing the roofing felt in overlapping layers builds a water barrier in situations whereby the weather damages or blows away the shingles. Although the application of a roofing felt on a flat roof is relatively easier and safer than working on a peaked roof, it’s advisable to take enough care and precautions. If you lack proper training and experience for this task, we’d recommend you employ a reliable professional to guarantee the best results and save you from further headaches especially in cases whereby unfortunate errors are made. This step by step guide will give you a good insight into the flat roof felt replacement process.

• Take a measurement of the width and length of the roof.

• Calculate the square footage by multiplying the numbers.

• Multiply the square footage gotten by three (it’s advisable to install three layers of roofing felt to create a really strong weather barrier).

• Use a claw hammer to remove the existing roofing felt.

• Use utility knife to cut the new felt to fit the length of the roof.

• Place the first piece along the roof’s edge and use a hammer tacker to tack the felt in place with staples or galvanized nails and hammer.

• Put the staples or nails at every 6 inches along the side touching the roof’s edge as well as down the short sides.

• Repeat the same process for the second piece, laying it out beside the first row of felt.

• Cut a piece of felt to the appropriate length using a utility knife to begin the second layer of roofing felt, and cutting it in half, lengthwise.

• Apply construction adhesive along the first row using a trowel.

• Press the first piece for the second layer onto the adhesive. Repeat this process until the roof is covered with a second layer

• Apply construction adhesive over the second layer to install the third layer. Begin with a full piece of felt without cutting it in half.

• Overlap each piece by 2 inches until you’ve completely installed the third layer.

What guarantee or warranty can I get?

Most material warranties come from the waterproofing layer manufacturers, and can last between 5 and 20 years. If your roofing contractor is on the manufacturer’s installer list, it might cover their work. It’s important that you always read through all the information given to you about your warranty so you know exactly what is included.

Elite Home Care

Based: in Dartford, DA4

Elite Home Care are a professional affordable business taking pride in every aspect of their work, p...

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Andrew F., DA15
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Roofing | Flat | Replacement in Sidcup

Really pleased with the work. Mark at Elite visited before the work started to have a...

Rooftop Roofing

Based: in Weybridge, KT13

Based in Wokingham, we are available across Berkshire,Buckinghamshire, and further afield. Rooftop R...

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Lynne N., GU47
7th February 2021

Roofing | Flat | Replacement in Sandhurst

Rang very quickly, pleasant on the phone, arranged to meet and then did not show up a...

WEATHERSHIELD ROOFING & BUILDING CONTRACTORS

Based: in Wickford, SS12

WEATHERSHIELD ROOFING & BUILDING CONTRACTORS is based in Wickford and have 52 positive reviews

Latest review

Brian A., SS5
6th February 2021

Roofing | Flat | Replacement in Hockley

Very clean and efficient workers. Very polite.

Southend Roofing

Based: in Wickford, SS12

Southend Roofing is an established business that has been installing new roofs for over 20 years.
W...

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Brian A., SS5
6th February 2021

Roofing | Flat | Replacement in Hockley

We had already arranged with another company.

B.UR. Roofer

Based: in Wolverhampton, WS11

Hi my name is billy I have been in the trade for 20 years we specialise in customer satisfaction
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Angela H., TF2
26th January 2021

Roofing | Flat | Replacement in Telford

The quotes I received were not too bad at all also it was good they gave a guarantee

SAFE STYLING HOME IMPROVEMENTS

Based: in Newark, NG24

How was service includes soffits facias guttering bargeboards downpipes GRP fibreglass flat roof re-...

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Val S., DE21
13th January 2021

Roofing | Flat | Replacement in Derby

Last to respond, but competetive quote. Don't like being called "Darling"

JTB HOME IMPROVEMENTS

Based: in Nottinghamshire, S80

Hi my name is John

I’m the owner of jtb home improvements we are a family run business and we...

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Val S., DE21
13th January 2021

Roofing | Flat | Replacement in Derby

Quick responce, competetive quote

WEATHERTECH

Based: in Woodville, DE11

This is a family run business and we have been established for 30 years we live at Woodville

Latest review

Val S., DE21
13th January 2021

Roofing | Flat | Replacement in Derby

Quick to repond, competetive quote

Homeguard Roofline and Fascias

Based: in Coalville, LE67

We at homeguard offer the best installations for affordable prices

Latest review

Val S., DE21
13th January 2021

Roofing | Flat | Replacement in Derby

Quick to respond, Reasonable quote, but for a different product.

PRESTIGE MIDLANDS

Based: in Wolverhampton, WV1

Prestige Midlands Ltd, based in the heart of Wolverhampton; are suppliers and installers of Fascia, ...

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Janet O., CV6
9th January 2021

Roofing | Flat | Replacement in Coventry

Very expensive.

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