Flat Roof Replacement Cost in Bristol | Average Prices 2025

Flat roofs are an affordable roofing option that are often found on garages, home extensions, modern homes and front porches in residential areas across Bristol.

Flat roofs are durable and long-lasting, but weather conditions do affect the material, and as Bristol is on the coast, it is often rainy during the winter months.

In this guide, we’ll explain the typical costs of flat roof replacement in Bristol, what extra costs you might come across and how to find and get quotes from a local roofing specialist for the job.

The Average Cost of Flat Roof Replacement in Bristol

Generally, Bristol flat roof prices are similar to those in most other parts of the southwest, but cheaper than in London and the southeast of England. Flat roofers in Bristol normally charge between £36 and £40 an hour or £275 to £335 per day. Two roofers carry out most jobs, so labour costs are doubled.

The flat roof cost can vary significantly depending on the materials you choose and the size of your roof. Different roof types and materials, such as EPDM rubber and fibreglass, can influence overall roof costs in Bristol, and these factors also contribute to varying costs across projects.

Roofing professionals in Bristol offer a full range of services, including roof replacements, which can affect the scope and pricing of your project.

When budgeting for a new roof, homeowners should be aware that the new roof cost can range widely, and understanding both materials and labour is essential for accurate planning. The overall cost of a flat roof replacement includes not only materials and labour, but also any additional services required for a complete installation.

To ensure you get the best value for your project, always compare quotes from multiple roofing professionals before making a decision. Working with a single contractor who can handle all aspects of the job is often more convenient than coordinating multiple contractors for different parts of the project.

Costs by Flat Roof Material

When considering roofing materials for your project, it's important to understand that there are various flat roofing options available, each with its own benefits.

Here’s a table giving you a comparison of the materials for a flat roof, helping you evaluate different roof types and roofing material options:

Bristol Flat Roof Prices

Flat Roof Replacement Cost in Bristol: Material and Labour

• Double garage (30m²): Between £830 and £1,440
• Extension Roof (40m²): Between £1,100 and £1,920
• Front Porch (3m²): Between £100 and £150
• Lead roof on bay window (3m²): Between £350 and £450
• Flat roof on modern home (80m²): Between £2,240 and £3,880

The typical flat roof cost for most projects falls within these ranges, but prices can vary based on materials, size, and location. Flat roof repairs are usually less expensive than a full replacement, but urgent or extensive repairs can add up, especially if not addressed promptly.

Flat roof replacements for commercial buildings, such as offices, warehouses, or retail spaces, may involve larger areas and more complex requirements compared to residential projects.

When planning a roof replacement project, it’s important to budget for all aspects, including materials, labour, and any potential hidden costs. Understanding new roof costs is essential to ensure you are prepared for all expenses involved in a new roof installation.

If you want a budget option, then choose a felt flat roof. Felt prices are between £28 and £40 per m². However, many people pick a middle range option like EPDM rubber or fibreglass at between £31 and £48 per m².

Owners of houses with bay windows often have lead flat roofs. Lead is the most expensive material at around £122 plus per m².

Flat Roof Replacement Bristol Cost:

Material Only

• Double garage (30m²): Between £170 and £440
• Extension Roof (45m²): Between £255 and £655
• Front Porch (3m²): Between £20 and £45
• Lead roof on a bay window (3m²): £300
• Flat Roof on modern home (80m²): Between £500 and £1,164

Labour costs at Bristol rates

You will normally have 2 roofers doing the job.

• Double garage (30m²): 2-3 days will be between £1,100 and £2,010
• Extension Roof (40m²): 2 -3 days will be between £1,100 and £2,010
• Front Porch (3m²): 1 day will be between £275 and £335
• Lead roof on a bay window: 1 day will be between £275 and £335
• Flat Roof on modern home (80m²; 6 to 7 days will be between £3,300 and £4,690

The total labour cost will depend on the complexity of the roofing work required, including any additional features, repairs, or upgrades needed.

Additional Costs to Consider

• Roof Insulation – The cheapest material is wool roll, which starts at around £7 per m². Insulation boards are more expensive and cost around £15 per m²
• Scaffolding hire – Average cost £890 - £1,040 per week for a flat roof installation on a house
• Waste removal/Skip hire – Around £220
• Roof windows/Skylights – Between £755 and £3,47,0, depending on the type of skylights or windows you choose.
• Emergency work/Same day callouts – On average, in Bristol, an emergency callout is between £100 and £250. Emergency flat roof repairs may be required for leaks, water damage, or storm damage, and these services are designed to make your roof safe and secure after urgent issues. A quick response is essential to ensure the roof is safe and prevent further structural issues or costly repairs.

Damaged flashing is a common cause of leaks, especially around chimneys, and may require repair or replacement as part of your project.

Small repairs, such as fixing minor leaks or cracks, can often be completed quickly and cost-effectively. Still, urgent attention is needed to prevent minor issues from escalating into major problems.

Factors Affecting the Cost of Replacing a Flat Roof in Bristol

There are several factors that will affect the total cost of replacing a flat roof in Bristol, and they include:

• The size of the roof – Because materials are sold by square metre (m²), the size and shape of the roof will make a difference to how much material you need to buy
• The type of material: You can use felt, which is the cheapest option at between £50 and £80 per m², or choose a more expensive, but longer-lasting material like fibreglass, which costs between £90 and £150 per m²
• Complexity and scaffolding - The average cost of scaffolding for a replacement flat roof on a house will cost around £890 to £1,040 per week
• Removal and disposal costs of the old roof – Your quote will usually include the removal of your old roof, but if it doesn’t include disposal, you might need to hire a skip. Expect to pay around £220 for skip hire.
• Insulation to comply with building regulations – Between £7 and £15 per m², depending on the type of insulation material you use.
• Labour rates in inner Bristol and outer boroughs – Between £200 and £225 a day.

UV damage from sunlight can accelerate the deterioration of flat roofing materials, leading to earlier replacement.

If your flat roof is in poor condition due to age or damage, or if you notice light coming through the roof or attic, it may be time to consider a replacement.

A leaking roof is a clear indicator that repairs or replacement may be necessary. Leaks can often be detected by stains or water damage on the ceiling, which are clear signs that repairs or replacement are needed. After replacement, it's important to ensure the new roof is structurally sound to prevent future issues.

The roof structure should be inspected for any damage or weaknesses before installation.

Insulation to Comply with Building Regulations

Insulation is required unless the roof covers an uninhabitable building, such as a detached garage. If insulation is required, it can have a cold roof or a warm roof, but to meet building regulations, it must have a U-value of 0.18 W/m²K.

You may need to consult your local authority to ensure all necessary permits and approvals are in place for your flat roof replacement.

A cold flat roof is cheaper to install. The insulation is placed inside between the roof joists. You will also need to add adequate ventilation to prevent moisture build-up and condensation.

A warm flat roof is better at keeping the heat inside. This is because there is minimal heat loss due to the insulation being placed underneath the waterproof layer on the outside of the roof.

How Long Does a Flat Roof Replacement Take?

On average, a flat roofing replacement in Bristol will take between 2 and 3 days to complete. A house roof, though, will take longer, probably between 6 and 7 days. Small jobs like a porch will only take a day.

Weather conditions will influence the timescales for completion. Drying times and labour schedules can be affected by bad weather.

Flat Roof Lifespan and When to Replace

Typical Lifespans for flat roofs are:

• Felt: 10 - 30 years
• EPDM: 25 -50 years
• Fibreglass (GRP): 20 – 30 years
• Lead: 100 years plus
• Green Roofing: 30 – 50 years

Many modern flat roofing materials are also designed to be low maintenance, which helps further extend their useful life.

Signs of Damage: When to Consider Replacement

Spotting early signs of damage on your flat roof can save you from costly repairs and protect your home from further issues. Homeowners in Bristol should keep an eye out for surface water pooling, as this can indicate poor drainage and increase the risk of leaks.

Cracks, blisters, and areas of moss and mould growth are also warning signs that your flat roof may be deteriorating.

It’s important to check not only the roof itself but also your interior walls and ceilings for any signs of water damage, such as damp patches, stains, or visible leaks. These issues can suggest that water is penetrating the roof and affecting the structure of your home.

If you notice any of these problems, it’s best to consult a professional roofer in Bristol as soon as possible. They can assess the condition of your flat roof and advise whether a repair or a full replacement is necessary to keep your property safe and dry.

Check your flat roof regularly for damage, especially if you live in an area with heavy rain and strong winds. If you see water pooling on your roof, cracks or tears in the material, or water leaking through the roof, you might need a replacement flat roof.

Finding a Roof Specialist in Bristol

Use MyJobQuote to find roofing specialists in Bristol. Post your job on the website, and we’ll find you trusted professionals to provide roofing quotes.

Try to get at least 3 quotes and compare quotes from multiple professionals to find the best price, quality, and service for your needs. Choosing the right specialist is crucial to ensure a smooth roof replacement project and avoid unexpected costs.

Protect your property from water damage before your roof needs expensive emergency repairs. MyJobQuote will save you from the frustration of locating reliable roofers in your area, and posting a job request is super easy.