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Flat Roof Repair Costs (UK 2025 Guide)

  • Writer: Daniel Cunliffe
    Daniel Cunliffe
  • Sep 2, 2025
  • 3 min read

Flat roofs are a popular choice for garages, extensions, and porches across Lancashire and Greater Manchester. They’re simple, affordable, and practical - but when they start leaking, the first thing most homeowners ask is: how much will a repair cost me?


Here’s a clear guide to 2025 flat roof repair costs, what affects the price, and how to know when a repair is enough - or when a full replacement is the smarter move.


Quick Answer: Typical Flat Roof Repair Costs


  • Minor felt patch repair: £80–£150

  • Torch-on felt re-seal (small section): £150–£350

  • EPDM rubber membrane patch: £200–£400

  • GRP fibreglass crack repair: £250–£500

  • Larger re-felting of a section (5–10m²): £400–£900


Note: These are 2025 averages for North West England. Prices vary depending on access, roof size, and materials.


What Affects the Cost of Flat Roof Repairs?


Not all flat roof leaks are the same. A patch job on a garage roof costs very differently to a full re-seal on an extension. Here are the main factors that change the price:


  • Roofing material – Felt repairs are cheapest; EPDM and GRP repairs cost more but last longer.

  • Extent of damage – Small punctures or cracks cost little; water pooling or rotten decking pushes costs higher.

  • Access – A single-storey garage is easy; a flat roof extension on the back of a terrace may need scaffold.

  • Urgency – Emergency callouts, especially in bad weather, will add to the bill.

  • Finish & guarantees – Better quality membranes and longer warranties come at a higher upfront cost.


Flat Roof Repair Cost Examples in Lancashire


Here are some real-world style scenarios to give you a clearer idea of what flat roof repairs cost locally:



Common Extra Costs to Watch For


The repair itself isn’t always the full bill. Extras can include:


  • Scaffolding or tower hire – £200–£500 depending on property height.

  • Waste disposal – Old felt or damaged decking may require skip hire (£200–£300).

  • Decking replacement – If water has rotted boards beneath the felt, add £30–£50 per m².

  • Protective coatings – Solar reflective paint or waterproof top coats cost extra but extend lifespan.


When to Repair vs Replace a Flat Roof


A patch job is often fine if:

  • The damage is small and localised.

  • The roof is under 10 years old.

  • The decking beneath is still sound.


Replacement makes more sense if:

  • Leaks keep coming back despite repairs.

  • Large areas of felt are blistered, cracked, or lifting.

  • The roof is nearing the end of its 15–20 year lifespan.


FAQs About Flat Roof Repair Costs


Got questions about fixing a flat roof? You’re not alone. Homeowners often want to know how long repairs last, whether it’s worth patching or replacing, and what hidden costs to watch out for. Here are the straight answers to the most common questions we hear.


Is it cheaper to repair or replace a flat roof?

Repairs are cheaper short-term, but if leaks are recurring, replacement may be more cost-effective over time.


How long does a flat roof repair last?

A professional felt repair can last 5–10 years; EPDM or GRP patches often last longer.


Can I repair a flat roof myself?

DIY patches are possible, but they rarely last. Poorly applied felt or sealant usually fails after the next freeze-thaw cycle.


Do flat roof repairs need scaffolding?

Not always. Single-storey garages are usually fine with ladders or a tower. Higher extensions or poor access may need scaffolding.


Final Word: Fair, Lasting Flat Roof Repairs


Flat roof leaks are frustrating, but repairs don’t need to break the bank. At Daniel Roofing And Guttering, we provide clear pricing, lasting repairs, and honest advice on whether patching or replacing is the right move for your property.


📞 Need flat roof repairs in Lancashire or Greater Manchester? Call us on 07922 564912 for a free quote today.


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