Flat roof replacement is often the most cost-effective solution when a roof has suffered extensive wear, recurring leaks, widespread membrane failure, or water damage to the roof deck. In many cases, repeated repairs only provide a temporary fix, while a full replacement restores long-term performance, durability, and weather protection.
At EBT Build, we replace flat roofs on garages, extensions, conservatories, and commercial buildings across the UK. Every project begins with a thorough roof assessment to determine the condition of the existing structure and the most suitable roofing system. All work is completed by our in-house team, with fixed written quotations, a free site survey, and a workmanship guarantee. Flat roof replacement is often completed alongside wider roofing services to ensure the entire roof structure remains secure, watertight, and built to last.
Member of the National Federation of Roofing Contractors, the UK’s leading roofing trade body.
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Consistently rated for workmanship, reliability, and project management.
Delivering home refurbishment and roofing projects with controlled processes, certified trades, and accountable project management.
Every flat roof replacement is delivered as a fully managed service. We take responsibility for removal, preparation, installation, and finishing so no stage is missed.
Our focus is not just replacing the surface but improving structure, waterproofing, and drainage to prevent future problems. All work follows guidance from the British Standards Institution.
In some cases, properties may require a completely new flat roof installation where the existing roof structure cannot support further repairs.
Our service covers everything required to deliver a fully finished and functional flat roof. We begin with a site survey, remove the old roof, and install the new system using approved methods.
Sealing, edge detailing, and drainage checks are handled correctly. The result is a flat roof designed to last and perform reliably. Many modern systems now use durable GRP fibreglass roofing, which provides strong waterproof protection and long service life for flat roofs.
Felt is the most common flat roofing system on older UK properties and one of the most frequently replaced. We remove the existing felt system, inspect and prepare the deck, and install a new layered felt or upgraded roofing system depending on the property and budget.
EPDM rubber roofing offers a long lasting and low maintenance alternative to felt. We replace failing felt and deteriorated membrane systems with fully bonded EPDM installations that provide a flexible, seamless, and weather resistant surface for the full roof area.
GRP fibreglass is one of the most durable flat roofing systems available. We replace ageing felt, EPDM, and torch on felt roofs with fully installed GRP systems that cure to a hard, seamless, joint free surface built to last 25 to 40 years.
Garage roofs are one of the most common flat roof replacement jobs we carry out. Whether the existing system is felt, EPDM, or a deteriorated fibreglass surface, we remove and replace garage flat roofs with a new system specified for the structure and exposure level.
Single storey extension roofs deteriorate over time and are frequently the source of persistent leaks and internal damp. We replace extension flat roofs including full deck inspection, insulation upgrades where required, and installation of a new weatherproof system.
We replace deteriorated conservatory roof coverings including polycarbonate panel replacements, lightweight tiled system installations, and solid roof conversions where the conservatory structure can support the additional load.
A flat roof replacement is a significant investment and the standard of work determines how long the new system performs. Poor deck preparation, incorrect fall, inadequate edge detailing, or the wrong system specified for the structure will cause the new roof to fail years before it should. At EBT Build every flat roof replacement starts with a proper structural assessment, correct system selection, and installation carried out without shortcuts.
We carry out flat roof replacements on garages, extensions, conservatories, and commercial properties across the UK. Every project is managed end to end by our own team, priced transparently with a fixed written quote, and completed to a standard that gives the new roof the full lifespan the system is capable of delivering.
If the roof structure is still stable, targeted flat roof repairs can sometimes resolve leaks and damaged sections without requiring full replacement.
Our service covers everything required to deliver a fully finished and functional flat roof. We begin with a site survey, remove the old roof, and install the new system using approved methods.
Sealing, edge detailing, and drainage checks are handled correctly. The result is a flat roof designed to last and perform reliably.
Many modern systems now use durable GRP fibreglass roofing, which provides strong waterproof protection and long service life for flat roofs.
We provide focused solutions for garages, extensions, and smaller roof areas. This includes flat garage roof replacement where limited access or space requires careful planning.
Our team checks the existing structure to ensure compatibility. This helps control costs and avoids unnecessary work.
We carry out full flat roof replacement projects under one managed plan. This service includes removal, preparation, installation, and final checks.
Each replacement is planned based on roof size, exposure, and property use to ensure long term performance and weather protection.
Every project starts with a detailed survey and planning phase. The existing roof is inspected and removed to expose the structure.
Includes:
Site survey planning, removal of existing flat roof, preparation assessment.
Once preparation is complete, the new flat roof system is installed. This includes fitting, sealing, and drainage setup.
Includes:
Roof installation, Sealing work, Drainage checks
The final stage focuses on quality and accuracy. All edges, joints, and finishes are inspected before handover.
Includes:
Final inspection, Performance checks, Project handover
We visit your property in UK to assess the scope and requirements.
You receive transparent pricing and a clear timeline for your project.
All trades are coordinated and managed under one system.
Snagging is completed and the project is delivered to agreed standards.
Flat roof replacement becomes necessary when damage is widespread across the roof surface rather than confined to a specific area. If the same sections are leaking repeatedly after repair work, the membrane has deteriorated across a large area, or the deck has absorbed significant moisture and begun to rot or delaminate, replacement is the more practical and cost effective option. A flat roof that is over 20 years old and showing consistent performance issues has typically reached the end of its serviceable life regardless of the system. EBT Build carries out a full structural assessment during the free survey and gives an honest recommendation on whether repair or replacement is the right option for the specific roof.
The cost of flat roof replacement in the UK typically ranges from £50 to £120 per square metre depending on the roofing system chosen, the size of the roof, the condition of the existing deck, and access requirements. A standard garage flat roof replacement typically costs between £800 and £2,500 fully installed. Extension flat roof replacements on a single storey rear extension typically range from £1,500 to £4,500 depending on size and specification. Conservatory roof replacements vary significantly depending on whether a polycarbonate, lightweight tiled, or solid roof system is being installed. EBT Build provides fully itemised written quotes after a free site survey so you know exactly what you are paying for before any work begins.
The time required depends on the size of the roof, the system being installed, and the condition of the existing deck. A garage flat roof replacement can typically be completed in one to two days. A standard extension flat roof replacement usually takes two to four days including removal of the existing system, deck preparation, and installation of the new covering. Larger or more complex projects involving significant deck repairs or insulation upgrades will take longer. EBT Build confirms all timelines in writing after the survey so you have a clear schedule before any work begins.
The best flat roofing system for replacement depends on the size of the roof, the structure, the budget, and the long term performance required. GRP fibreglass is one of the most durable options available, curing to a seamless joint free surface that lasts 25 to 40 years with minimal maintenance. EPDM rubber roofing is a flexible and long lasting alternative that is well suited to larger roofs and complex shapes. Torch on felt is a cost effective system with a lifespan of 15 to 25 years that remains a practical choice for garages and smaller flat roof areas. EBT Build assesses the roof structure and usage during the survey and recommends the most appropriate system before any work is agreed.
Flat roof replacement is an opportunity to upgrade insulation at the same time, and We discusses insulation options during the survey on every replacement project. Many older flat roofs have inadequate or deteriorated insulation beneath the covering that is contributing to heat loss and in some cases condensation problems within the roof structure. A warm roof design places the insulation above the deck to eliminate cold bridging and is the most effective approach for most flat roof replacements. Insulation upgrades are included in the written quote where applicable and are installed to meet current UK building regulation U-value requirements.
Flat roof replacement can be carried out in winter but is subject to weather conditions on the day. Most flat roofing systems require dry conditions and temperatures above a minimum threshold for correct installation — GRP fibreglass in particular is temperature sensitive and cannot be installed in very cold or wet conditions without affecting the cure. EPDM and torch on felt systems have wider installation tolerances but still require the deck to be dry before work begins. EBT Build monitors weather conditions and schedules replacement work accordingly. If conditions on the day are not suitable for the system being installed, work is rescheduled to ensure the replacement is carried out correctly.
Reliable home refurbishment and roofing specialists delivering compliant, fully managed building work across the UK.
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