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    Newly installed flat roof on a residential extension

    Flat Roofing Spennymoor

    Specialist Flat Roofs
    in Spennymoor & County Durham.

    Flat roofing specialists — EPDM rubber, GRP fibreglass and modern felt systems built for British weather and backed by long manufacturer warranties.

    12+ years' experience · written guarantee on every job

    • 12+

      Years' experience

    • 100%

      Workmanship guarantee

    • 24/7

      Emergency call-out

    • Free

      On-site estimates

    Overview

    What it is, who it's for,
    and when it's needed.

    What it is
    Specialist flat roof installation, replacement and overhaul — extensions, garages, dormers, porches and bay roofs in EPDM rubber, GRP fibreglass and modern torch-on felt systems.
    Who it's for
    Anyone with a flat roof on an extension, garage, porch or dormer that's nearing the end of its life, leaking, blistering or visibly tired.
    When you need it
    When you see ponding water that doesn't drain, blistering or splits in the surface, internal staining below, or when the roof is past 15–20 years old and showing its age.
    Why it matters
    Flat roofs have changed enormously in the last 20 years. Modern EPDM and GRP systems carry warranties of 20–25 years and outperform old felt by an order of magnitude — but only when installed correctly.

    Don't Wait

    What it costs to leave it.

    An old flat roof rarely fails dramatically. It declines gradually — until one heavy rainfall pushes it over the edge and the ceiling below comes down with the water.

    Risks of ignoring it

    • Ponding water accelerates UV and freeze-thaw damage on every flat roof system.
    • Blistering felt allows water in beneath the surface — the leak appears years before the visible failure.
    • Old extensions with failing flat roofs lose insulation value rapidly.
    • A leaking flat roof can rot the deck below, doubling the cost of replacement when finally tackled.

    Common mistakes to avoid

    • Patching old felt year after year instead of replacing once and properly.
    • Choosing the cheapest system without checking warranty and installer accreditation.
    • Skipping the new deck where the existing one is wet or rotten.
    • Using DIY-grade pour-on coatings as a long-term fix — they're not.

    Our Process

    A clear, honest path
    from quote to guarantee.

    1. 1

      Inspection

      Full assessment of existing roof, deck condition, falls, drainage and edge details.

    2. 2

      System Selection

      We discuss EPDM, GRP and felt — the trade-offs, warranties and best fit for your specific roof.

    3. 3

      Quote

      Itemised written quote covering strip-out, deck replacement if needed, system, edges and disposal.

    4. 4

      Installation

      Strip back to deck, replace any rotten boards, fit new insulation if specified, install chosen system.

    5. 5

      Sign-Off

      Walk-around with you, photographs, written workmanship guarantee plus manufacturer warranty.

    Why It Pays

    Concrete benefits.
    No vague promises.

    • 20+ Year Warranties

      Modern EPDM and GRP carry 20–25 year manufacturer warranties on top of our workmanship guarantee.

    • Seamless Installs

      EPDM rubber on most domestic roofs is a single sheet — no joints to fail at.

    • Walk-On Strength

      GRP fibreglass roofs are robust enough to walk on for maintenance — useful for terraces and balconies.

    • UV Resistant

      Modern systems are formulated to handle decades of UV without the cracking that finished off old felt.

    • Fast Install

      Most domestic flat roofs are completed in 1–3 days.

    • Fully Guaranteed

      Every flat roof we install carries our written workmanship guarantee and the system manufacturer warranty.

    Deeper Detail

    Materials, methods
    and the full picture.

    Everything below is what we'd want to know if it were our roof.

    Flat roofing systems compared

    Three modern systems dominate domestic flat roofing in the UK. Each has its place.

    • EPDM rubber — single-sheet, seamless, 20+ year warranty, excellent value, our most-fitted system
    • GRP fibreglass — walk-on strength, seamless finish, ideal for balconies and high-traffic flat roofs
    • Torch-on felt — modern multi-layer felt systems, robust and proven, lower up-front cost
    • Mastic asphalt — heritage and specialist applications, long-lived but specialist install

    Decks, falls and insulation

    A flat roof is only as good as what's underneath. We always inspect the deck, replace any rotten OSB or ply, and check that falls direct water properly to outlets. Where building regs apply — most warm roof renewals — we install proper insulation as part of the build-up.

    When EPDM, when GRP, when felt

    EPDM is our default for most extension and garage roofs — best balance of cost, warranty and reliability. GRP is the right call where the roof will be walked on, where it carries a balcony, or where the visual finish matters. Modern felt remains a sound choice for budget-conscious projects on simple, low-traffic roofs.

    Flat roofs across County Durham

    We install and replace flat roofs across Spennymoor, Durham, Bishop Auckland, Ferryhill, Shildon, Newcastle and the surrounding areas. Single-storey extensions, detached garages, dormer roofs, porches and bay window roofs — all handled in-house.

    Common Questions

    Straight answers
    from a local roofer.

    Can't find what you're looking for? Call Sean directly on 07785 964863.

    Ready When You Are

    Get a clear quote for flat roofs —
    usually within 24 hours.

    Free, on-site estimate. No pressure, no upsell, no obligation. Just an honest assessment from a local roofer who answers his own phone.

    Written guarantee on every job Fully insured Local family-run business

    Speak To Sean

    Quotes returned the same day.

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