Hayes, BromleyPlatinumflatroofingltd@gmail.com - 07533 92109307753 651460 HomeAboutServices Service Areas Our WorkReviewsContact07533 921093Request Estimate Flat roofing Bromley - Flat roofing services - Domestic flat roofing Flat roofing specialists · Bromley, Kent & London # Domestic Flat Roofingfor Extensions, Garages& Dormers in Bromley A flat roof on your extension, garage, dormer or porch that is specified properly, installed by a specialist and guaranteed for 10 years on workmanship, with a free fixed price agreed before anybody starts. Request your free estimate07533 921093 16 years in flat roofing · free fixed-price quotes · fully insured 16 years specialising in flat roofing 10-year workmanship guarantee Free fixed-price quotations Sika, Danosa and Bauder trained Fully insured Overview ## What Domestic flat roofing Involves & When You Need It ### What it is Domestic flat roofing covers the flat and low-pitch roofs on houses: rear and side extensions, garages, dormers, porches, bay roofs, outbuildings and small terraces. We replace, refurbish and newly install them using hot-air welded single-ply or reinforced liquid waterproofing over a properly specified warm roof build-up. ### Who it is for Homeowners whose flat roof is leaking, ponding or simply old; people building an extension who want the roofing element done by a specialist rather than the general trade on site; and landlords with let property who want the problem resolved once rather than revisited annually. ### When it is needed When you see ceiling stains, damp at the wall junction, blistering or splits, water sitting on the roof after rain, or a roof that has been patched more than once. Also when you are building; the roof specification should be settled before the deck goes down. ### Why a specialist matters Domestic flat roofs are usually small, which tempts people to treat them as simple. They are not: an extension roof has an abutment to the house, a rooflight kerb, a door threshold, an outlet and a perimeter drip, all within a few square metres. That is a higher density of detailing than most commercial roofs, and the detailing is what decides whether it leaks. What happens if it is left ## Flat Roof Problems Do Not Stay the Same Size ### Damage to finished living space Extension and dormer roofs sit over kitchens, bedrooms and living rooms. A leak damages plaster, decoration, flooring and joinery, not just the roof. ### Insulation soaks and stops working Wet boards lose thermal performance, so you heat the room harder while the damp spreads through the build-up. ### Deck and joist decay Timber that stays damp softens and loses strength. Left long enough, the roofing job becomes a structural repair. ### Repair after repair Two or three patch jobs across a few winters usually cost more than replacing the roof properly, and none of them carries a guarantee across the roof. ### Common mistakes we are called in to correct - Getting the cheapest available covering laid over an existing wet build-up - Letting a general builder detail single-ply without the manufacturer training - Accepting a quote that does not name the membrane, the insulation or the guarantee - Building a rooflight kerb or setting a door threshold before the roof build-up depth is known - Leaving the outlet blocked so the roof ponds all winter Our process ## Five Steps from First Call to Guaranteed Roof - 01 ### Inspection We come out, get on the roof, check the deck, falls, outlet, upstands and abutment, and establish whether the build-up is dry. - 02 ### Diagnosis & fixed price We explain what has failed and why, then give you a free, fixed-price quotation naming the build-up and the system, no 'from' prices. - 03 ### Installation Strip-out where needed, deck repaired, vapour control layer sealed, insulation laid and fixed, then single-ply hot-air welded or a reinforced liquid system applied, with every detail formed properly. - 04 ### Testing & tidy Welds probed or coverage verified, outlet flow checked, and the property left clean with all waste taken away. - 05 ### Completion & guarantee A 10-year workmanship guarantee, with manufacturer-backed guarantee options available where applicable for the specified system. What you get ## The Practical Difference a Specialist Makes ### A specialist on a small roof The same standard of specification and detailing we apply to commercial work, on your extension or garage. ### Warm roof performance Correct vapour control and continuous insulation above the deck, so the room below is warmer and condensation is controlled. ### Fixed price, no drift Free quotation, fixed price as standard, so the number you agree is the number you pay. ### Clean modern finish Welded single-ply gives a flat, sharp finish in a choice of membrane colours, worth thinking about if the roof is overlooked from upstairs windows. ### One visit, one trade Roof, details, rooflight weathering, edge trims and guttering handled together instead of split across trades. ### Guaranteed for 10 years Workmanship guaranteed for a decade, from a company that only does flat roofing. In detail ## Domestic flat roofing: Materials, Methods & Variations ### Extension roofs The abutment to the existing house is the critical detail: the membrane needs a proper upstand terminated into or against the wall, allowing for what the main roof above is discharging. Add a rooflight kerb, a set of bi-fold or french door thresholds and a single outlet, and an extension roof is essentially all detail. We resolve the heights before the build-up goes on, because after the plaster is in, options narrow. ### Garages and outbuildings Garage roofs are usually old felt on a timber or concrete deck, with poor falls and a perimeter that has taken years of weather. They are straightforward to re-roof in single-ply or a reinforced liquid system, and the main decisions are whether to correct the falls, whether to insulate to a warm roof build-up, and whether the edge trims and guttering should be renewed at the same time. ### Dormers, porches and bays Small roofs with a high ratio of detail to field area: cheek junctions, window heads, tight upstands and awkward access. Reinforced liquid systems often suit them best because the waterproofing can be wrapped seamlessly around shapes that no sheet will fit cleanly. ### Terraces and walk-on areas Where a domestic flat roof is used, a roof terrace or a balcony over a room, the waterproofing needs a trafficked specification with an anti-slip finish, plus a threshold and drainage arrangement that keeps water away from the door line. It is a different specification from a roof nobody walks on. ### Insulation and comfort Older domestic flat roofs are frequently cold roofs with limited, poorly ventilated insulation, which is why the room under them is cold in winter and shows condensation staining at the ceiling edges. Rebuilding as a warm roof, with a sealed vapour control layer and continuous insulation above the deck, addresses both at once and does not cost you ceiling height. ### What we will tell you honestly If the roof only needs a detail corrected, we will say so and price that. If the build-up is wet and a new covering would be money wasted, we will say that too, with the evidence. Quotations are free and fixed price; detailed roof inspections and photographic reports may be chargeable, and we tell you before we attend. ### Related services - Single-ply roofing - Warm roof systems - New builds & extensions ### Where we work - Bromley - Kent - London - Buckinghamshire - Dartford - Orpington - Sevenoaks - Beckenham - Croydon - NationwideSee all service areasAll flat roofing servicesPlatinum Flat Roofing homeContact us Recent work ## Domestic flat roofing, Completed Projects Common questions ## Domestic flat roofing, Your Questions Answered How much does a domestic flat roof cost?Each roof is quoted individually on its size, build-up, access and detailing; we do not publish 'from' prices because they are meaningless on flat roofs. The quotation is free and fixed price. How long will the work take?Most extension, garage and dormer roofs are completed in a matter of days. We confirm the programme with the quotation rather than guessing on the phone. Should I repair or replace?It depends on whether moisture has reached the insulation. If the build-up is dry and only details have failed, remedial work is usually right. If it is wet, replacement is cheaper over any reasonable period. The inspection settles it. Which system will you use on my roof?Usually hot-air welded single-ply, Sika, IKO Armourplan, Danosa or Bauder, or a reinforced liquid system on small, detail-heavy roofs such as dormers and porches. The choice is named in the quotation. What guarantee do I get?A 10-year workmanship guarantee. Manufacturer-backed guarantees are available where applicable, depending on the specified system and project. Can you upgrade the insulation at the same time?Yes, and it is the right moment. A warm roof build-up goes above the deck, so you gain thermal performance without losing ceiling height. Do you deal with the guttering and fascias too?Yes: fascias, soffits, trims and rainwater goods can be included so the whole roof edge and drainage path is done by one team. How do I pay?Payment is by bank transfer. Deposits and stage payments apply on larger projects. Do you attend emergency leaks?Emergency leak and storm-damage call-outs are accommodated where possible. Call us and we will tell you straight what we can do and when. Which areas do you cover?Bromley, Kent, London and the South East, including Orpington, Beckenham, Croydon, Dartford and Sevenoaks. ## Get a Free Fixed-Price Quote for Domestic flat roofing Tell us about the roof and your postcode. We will inspect it, tell you what has actually failed and give you a fixed price, backed by a 10-year workmanship guarantee. Request your free estimate07533 921093 16 years in flat roofing · Sika, Danosa and Bauder trained · fully insured · 10-year workmanship guarantee Single-ply and liquid-applied flat roofing specialists serving Bromley, Kent, London and the South East. ### Services - Single-ply roofing - Liquid waterproofing - Refurbishments & remedial works - Warm roof systems - New builds & extensions - Balconies & walkways - Rooflights - Fascias, soffits & guttering ### Service areas - Bromley - Kent - London - Buckinghamshire - Dartford - Orpington - Sevenoaks - Beckenham - Croydon - Nationwide ### Contact - Hayes, Bromley - 07533 921093 - 07753 651460 - Platinumflatroofingltd@gmail.com - @platinumflatroofingltdCompany No. 17149842Fully insured · 10-year workmanship guarantee © 2026 Platinum Flat Roofing Ltd. All rights reserved.ReviewsPrivacy policyTerms & conditions Call nowFree quote