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Whether your roof is leaking, reaching the end of its life, or simply showing its age, replacing it is one of the most important investments you can make in your home.

It's not a small job - and it's not a cheap one either.

This guide covers everything you need to plan a roof replacement properly, from understanding the signs that it's time to act, to budgeting, finding the right roofer, and knowing what to expect on the day.

Does your roof actually need replacing?

Before spending thousands, it's worth asking: is a full replacement really necessary, or could repairs buy you more time?

A roof repair makes sense for isolated damage. For example:

• A handful of slipped tiles

• Minor flashing issues

• A small leak with a clear cause

But when problems become widespread, repairs start to become false economy.

You end up spending repeatedly on patch fixes when a full replacement would have been cleaner and cheaper in the long run.

Signs that you probably need a replacement, not just a repair:

• Missing, cracked, or damaged tiles across large areas of the roof

• Persistent leaks that keep coming back even after repairs

• A sagging or dipping roofline when viewed from the street

• Daylight visible through the roof boards when you stand in the loft

• Water stains spreading across ceilings or upper walls

• Moss, algae, or lichen covering large sections of the surface

• A roof that is simply old - most concrete tiles last 40-60 years, natural slate can go well beyond 100

Which roofing material is right for you?

The material you choose affects how your home looks, how long the roof lasts, and how much you'll spend. It's worth thinking about this early - before you start getting quotes - so you know what to ask for.

Here's a quick comparison to help.

Age alone isn't always a reason to replace - a well-maintained slate roof from the Victorian era can still be in excellent condition.

But if your roof is approaching or beyond its expected lifespan and showing other signs of wear, it's worth getting it looked at.

For a deeper look at the options, our slate vs tile roof guide is a good starting point. If you have a flat roof, we also cover the best flat roof options for domestic extensions and have guides on EPDM rubber roofing and felt flat roofs.

What does a roof replacement actually involve?

A full roof replacement means stripping everything back to the rafters and starting again. That includes the tiles or slates, the underlay, the battens, and the flashing.

It gives your roofer the chance to properly inspect the underlying structure, replace any damaged timber, and upgrade insulation to current standards.

Here's what the process typically looks like:

Step 1 - Strip the existing roof

Everything comes off - tiles, slates, membranes, battens and old underlay. This is often when hidden problems appear, such as rotten timbers or failed flashings. A good roofer will flag these before doing anything else.

Step 2 - Inspect and repair the structure

Rafters, ridge beams, valleys and hips are all checked. Any damaged or decayed timber is replaced at this stage. If you're changing to a heavier or lighter material, structural adequacy may also need checking.

Step 3 - Install new underlay and insulation

A breathable membrane goes down first. Insulation is upgraded where required - more on building regulations below. Ventilation also needs to be right here, because a well-insulated roof without proper airflow creates condensation problems that can look like leaks.

Step 4 - Batten and tile

New treated battens are fixed at the correct spacing for your chosen tile or slate. Then the new covering goes on. For flat roofs, this is when the EPDM or GRP membrane is installed.

Step 5 - Flashing, gutters and finishing

Lead flashing is fitted at all the critical junctions - chimneys, valleys, abutments and skylights. This is where many leaks start on poorly finished jobs, so it's worth asking your roofer specifically about their approach to flashing details.

Step 6 - Final inspection and sign-off

A proper final check, a thorough clean-up, and handover of all documentation - including any building regulations certification and guarantees.

Find local roofers and roofing services near me

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How much does a roof replacement cost?

Roof replacement is one of the bigger home improvement costs you'll face. The price depends on roof type, size, material choice, complexity, and where you are in the country.

Average roof replacement costs UK

The average cost of a roof replacement in the UK is £8,000, with most homeowners spending between£4,000 - £19,000 - the higher end reflects larger, more complex roofs such as a slate hip roof.

For a full breakdown of what drives these costs, see our roof replacement cost guide.

Every Checkatrade job is backed by our £1,000 guarantee

Up to £1000. Eligibility criteria and T&C’s apply.

Don't forget scaffolding

Scaffolding is one of the most commonly forgotten costs when budgeting for a roof replacement - and it's not small. Based on our own data, here's what you can expect to pay per week:

Most roof replacements require scaffolding for at least the duration of the job - typically one to two weeks. Always ask your roofer whether scaffolding is included in their quote or priced separately.

Scaffolding costs: Price breakdown 2026 (UK)

Scaffolding is essential for many home improvement projects, including roof repairs, exterior painting, and repointing. Discover average scaffolding costs, factors that affect price, and what you need to know about permits.

Learn more

Other costs to factor in

• Roof repair costs - if structural issues are discovered mid-job, these are often costed as a provisional sum. See our roof repair cost guide for typical prices

• Insulation upgrades - usually required under current building regulations (see below)

• Waste disposal - roughly £300 per skip

• VAT - a full roof replacement with insulation is charged at the standard 20% VAT rate

Do you need planning permission or building regulations approval?

This is an area where many homeowners get caught out.

Planning permission and building regulations are two different things - and for a roof replacement, it's building regulations you're most likely to need.

Planning permission

In most cases, a like-for-like roof replacement does not require planning permission. You're unlikely to need it if you're replacing materials in kind and not changing the shape or height of the roof.

You will need planning permission if:

• Your property is listed

• You live in a conservation area and are changing roof materials

• You're adding features that alter the roofline (such as dormers or new skylights)

• An Article 4 direction applies in your area

When in doubt, check with your local planning authority before any work starts.

Building regulations

Building regulations approval is a separate requirement, and it's more likely to apply to a full replacement. You'll generally need approval if:

• More than 50% of the roof covering is being replaced

• More than 25% of the building envelope is affected

• Structural work is being carried out (new rafters, ridge beams, etc.)

• The new covering materially changes the fire performance or weight of the roof

Current regulations (Approved Document L) also require insulation to be upgraded when significant re-roofing work takes place - typically to a U-value of 0.16 W/m²K for retrofits.

One of the simplest ways to stay on the right side of this is to hire a TrustMark-registered or competent person scheme-approved roofer. They can self-certify the work and submit compliance certificates to building control on your behalf.

Watch out for asbestos

If your home was built before 2000, there's a chance some roofing materials - particularly on garages, porches, extensions, or outbuildings - could contain asbestos.

Disturbing asbestos-containing materials without the right precautions is dangerous and in some cases legally notifiable under HSE rules.

If there's any possibility of asbestos on your property, make sure your roofer is qualified to identify and handle it, or arrange a separate survey before work begins.

Asbestos removal near me

This guide explains how to find checked asbestos removal companies near you, what the work involves, typical costs, and the key questions to ask before you hire.

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What about bats?

Worth knowing before work starts: all UK bat species and their roosts are fully protected by law.

If there are any signs of bats using your roof space - droppings, entry points, sightings at dusk - work must pause and the situation needs to be routed through Natural England.

A responsible roofer will flag this during their initial survey if there are any signs. Don't ignore it.

From repairs and replacements, through to cleaning services and additions like solar roof panels, take a look at our roofing hub for help with deciding the jobs that need doing above your head.

How to find the right roofer

Getting the right person for the job matters as much as choosing the right materials.

What to look for

• Evidence of relevant experience - ask to see photos of recent, similar jobs

• Membership of a recognised trade body, such as the National Federation of Roofing Contractors (NFRC) or the Confederation of Roofing Contractors

• Public liability insurance - £2 million minimum, ideally £5 million

• A written, itemised quote that breaks out labour, materials, scaffolding, and waste disposal

• A workmanship guarantee of at least 10 years - ideally insurance-backed, so you're covered if the company closes

All trades on Checkatrade are thoroughly checked and have to pass up to 12 checks before they can be listed - including checks on qualifications, insurance, and identity.

Read our full guide on how to hire a roofer for more detail on what to look for.

Red flags to avoid

• Cash-only payment requests

• No written quote or contract

• Pressure to start work immediately or pay a large deposit upfront

• Vague or verbal-only guarantees

• Reluctance to provide proof of insurance or a registered business address

• Significantly lower quotes than everyone else (usually means something is being cut)

Top tip: It is a good idea to get a few quotes before committing to the work. It lets you compare pricing, spot inconsistencies in scope, and make a more confident decision. It's also worth asking each roofer what their quote specifically includes - scaffolding, waste removal, and VAT can be where the differences hide.

Getting a contract in place

Once you've chosen your roofer, make sure everything is agreed in writing before any work starts. A proper contract should include:

• The full scope of work - materials, quantities, specifications

• Start date and expected timeline

• Payment schedule (a reasonable deposit is usually 10-20%, not the full amount upfront)

• What happens if unforeseen issues arise (such as rotten timbers found during strip-off)

• Guarantee and warranty details

• Dispute resolution process

Having it in writing protects both you and your roofer. For more detail on this, see our guide on written contracts with tradespeople.

The Checkatrade guarantee provides additional peace of mind when you book a trade through us.

Preparing your home for the work

Replacing a roof is a noisy, dusty, messy job. A bit of preparation goes a long way.

Before work starts

• Clear your loft of anything valuable or fragile

• Move cars off the driveway or away from the property to avoid debris damage

• Protect garden furniture, plants, and decking with tarpaulin or move them away from the house

• Let your neighbours know - roof work is loud, and a heads-up goes a long way

• Consider whether you need to make alternative sleeping arrangements if noise is a problem

During the work

• Try to check in with your roofer at the start and end of each day

• Don't be afraid to ask questions - it's your home and your money

• Keep an eye on progress against the agreed scope, without micromanaging

• Ask for photos if structural work is being done before it's covered up

After completion

• Walk the whole job with your roofer before making any final payment

• Check all areas have been cleaned up properly

• Confirm you've received all documentation - guarantees, building regulations sign-off, waste transfer notes

• Keep everything in one place for future reference (or for when you sell)

How to budget for a home renovation in 6 easy steps

Knowing how to budget for a home renovation is a challenge. However, we're here to help. So, whether it's a loft conversion, bathroom refit or kitchen upgrade, we're going to go through the steps you can take to maximise your pennies and create a smart budget.

Learn more

Roof replacement planning checklist

A simple checklist to keep you on track throughout the project.

Things to remember about roof replacement

• Arrange a professional roof inspection

• Check if you need planning permission

• Check if building regulations approval is required

• Check for potential asbestos (pre-2000 properties)

• Check for signs of bats in the loft

• Get at least three written, itemised quotes

• Confirm scaffolding is included or separately priced

• Agree on a written contract before work starts

• Confirm payment schedule (small deposit only upfront)

• Ask for 10-year insurance-backed guarantee

• Prepare your home before start date

• Carry out a final inspection before last payment

• File away all documentation including guarantees and certifications

How long will it take?

Timeline depends on the size and complexity of your roof, the materials being used, and the weather.

As a general guide:

Weather always plays a part - work can't safely continue in high winds or heavy rain. A good roofer will have a plan for temporary weatherproofing if the roof needs to be left open overnight.

Frequently asked questions

Do I need planning permission to replace my roof?

Not usually, as long as you're replacing like-for-like and not changing the shape or height of the roof. However, you may need consent if your property is listed, sits in a conservation area, or you're making changes that visibly alter the exterior. Always check with your local authority if you're unsure - it's worth a quick call before any work begins.

Do I need building regulations approval for a roof replacement?

Probably yes, if you're replacing a significant portion of the roof. UK building regulations require approval when more than 50% of the roof covering is being replaced, structural changes are made, or the new covering materially changes fire performance or loading.

Current regulations also require insulation to be upgraded to meet U-value standards. A competent person scheme-registered roofer can certify the work themselves and deal with building control on your behalf.

How much does a roof replacement cost?

The average cost of a new roof is £8,000. However, costs can range massively from £120–£275 per m².

Usually, prices will be much the same regardless of whether you’re investing in a brand new roof for a new build or simply replacing your existing roof.

It varies considerably depending on roof type, size, material, and your location.

How long does a new roof last?

That depends on the material. Concrete tiles typically last 40-75 years, clay tiles 50-100+ years, and natural slate can last well over 100 years. Modern flat roof systems such as EPDM can last 40-50+ years when properly installed.

Regular maintenance - keeping gutters clear, treating moss, fixing minor flashing damage promptly - will help your roof reach its full lifespan.

When should I repair rather than replace my roof?

Roof repair makes sense for isolated, localised damage - a few slipped tiles, minor flashing issues, or a small leak with a clear cause. When problems are widespread, recurring, or structural, replacement tends to be more cost-effective in the long run. If you're unsure which applies to you, a professional inspection is the best starting point.

What guarantee should I expect from a roofer?

A 10-year workmanship guarantee is the industry benchmark. Ideally, it should be insurance-backed - which means you're covered even if the roofing company ceases trading before the guarantee period is up. Always get the terms in writing and keep a copy somewhere safe.

Can I stay in my house during a roof replacement?

In most cases, yes. It's noisy and there may be some dust, but it's generally liveable. The main consideration is whether any rooms are directly below areas where the roof is open - in which case, it's sensible to clear those rooms and cover furniture.

Your roofer should have weatherproofing in place at the end of each working day.

What is the best roofing material for a UK home?

There's no single answer - it depends on your property, budget, and location. Concrete tiles are the most common choice for modern UK homes due to their cost and availability. Clay tiles suit period properties. Natural slate is the premium option with the longest lifespan, and it's often required in conservation areas.

For flat roofs, EPDM rubber has become the most popular modern choice due to its durability. See our slate vs tile guide for a more detailed comparison.

Do I need to tell my insurer about a roof replacement?

Yes - it's worth notifying your home insurer before and after the work. During the replacement, your roof will temporarily be more exposed, which can affect your cover. After completion, a new roof can sometimes improve your premium. Check your policy terms and let them know either way.

What is roof felt and when does it need replacing?

Roof felt (also called underlay or sarking felt) sits under the tiles and acts as a secondary barrier against moisture. In older properties, the original felt can degrade and become brittle over time. If you're replacing your roof, new breathable membrane will be installed as part of the job.

If your tiles are in good condition but the felt has failed, it may be possible to replace just the felt under the tiles without a full replacement.

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