Cost is one of the most important factors when choosing a roofing system, and the question of whether flat roofs are cheaper than other options comes up regularly. The honest answer depends on several variables, but flat roofs do generally offer cost advantages in certain situations. This guide breaks down the costs involved so you can make an informed decision.
Are Flat Roofs Cheaper to Install?
In most cases, yes — flat roofs are cheaper to install than pitched roofs, primarily because they require significantly less material and labour. A flat roof uses far fewer structural components: there are no rafters, no ridge boards, no hip or valley timbers, and no complex cutting and fitting work. The roofing membrane or covering is also typically faster to lay than individual roof tiles on a pitched surface. For extensions, garages, commercial buildings, and flat-roofed sections of residential properties, a flat roof installation is usually the more cost-effective option.
Flat Roof Material Costs
The cost of a flat roof varies significantly depending on the material chosen. Felt (bituminous) roofing is the most affordable option, typically costing £40 to £60 per square metre installed, but it has a shorter lifespan of around 10 to 20 years. EPDM rubber roofing costs approximately £60 to £90 per square metre installed and offers a lifespan of 30 to 50 years, making it excellent value over time. GRP fibreglass roofing typically costs £70 to £100 per square metre installed and offers a lifespan of 30 years or more. Single-ply membrane systems are at the premium end, costing £80 to £120 per square metre, but offer outstanding durability for commercial applications.
North East Roofing Supplies stocks materials for all flat roof systems at competitive trade prices. Browse our full flat roof product range to compare options.
Long-Term Costs to Consider
While the upfront installation cost of a flat roof is typically lower, there are long-term cost considerations to weigh up. Flat roofs generally require more frequent inspection and maintenance than pitched roofs, as standing water and debris accumulation can accelerate wear if not managed. Choosing a higher-quality flat roof system — such as EPDM, GRP, or single-ply — rather than the cheapest felt option will typically result in lower lifetime costs due to the reduced frequency of replacement.
Are Flat Roofs Cheaper Than Pitched Roofs Overall?
For new builds, extensions, and outbuildings, flat roofs are almost always cheaper to construct than an equivalent pitched roof. However, over a 50-year period, a high-quality pitched roof with durable concrete or clay tiles may prove more cost-effective than a flat roof that requires replacement every 15 to 20 years. The right choice depends on your budget, the building’s purpose, and how long you plan to own the property.
Get a Competitive Price on Flat Roof Materials
Whether you’re a roofing contractor or a homeowner managing your own project, North East Roofing Supplies can supply flat roof materials at trade-competitive prices. Visit one of our North East branches or contact our team for a quote today.
