Is a flat roof cheaper than a pitched roof?

Question

We're planning a single storey extension across the back of the house, about 5m by 4m, and the builder has asked whether we want a flat roof or a pitched one. The flat roof is obviously cheaper upfront, but I've heard they don't last as long and can leak. Over say twenty years which actually works out cheaper once you factor in repairs?

Shaun · Accepted Answer

I personally would recommend pitched roof  all day long

James · Answer

A proper 3 layer system flat roof done by a professional outfit like ourselves last  twenty five years they are signed off by building control

Terry · Answer

Hi buddy, depends on the size of the Roof and what needs to be done

Danny · Answer

A pitched roof if possible every time 
Regards Danny

Francis · Answer

Generally, yes—a flat roof is usually cheaper to build than a pitched roof, especially on a new extension or garage.

Shamas · Answer

Flat roof would be cheaper as the materials are cheaper

Jo · Answer

For a 5m x 4m single-storey rear extension, both flat and pitched roofs can be good options, but there are some differences to consider over the long term.

A flat roof is generally cheaper to install initially and, when designed and installed correctly using modern materials such as EPDM or GRP, can provide many years of reliable service. However, it does have more maintenance requirements and may eventually need repairs or replacement, particularly around joints, outlets and flashing.

A pitched roof will normally cost more upfront, but it generally has better natural drainage, is less prone to standing water and can have a longer overall lifespan. Over a 20-year period, the additional installation cost can potentially be offset by reduced maintenance and fewer repairs.

For this reason, we would recommend considering the **whole-life cost rather than simply the initial installation price**. A good-quality flat roof can still be an excellent choice where budget or the design of the extension is the priority, provided it is properly designed, adequately insulated and installed using quality materials.

We would be happy to discuss both options and provide a clear quotation so you can compare the initial cost and expected long-term maintenance before making a decision.

Colin · Answer

This only depends on the pitch if a low pitch and you tile it or slate will end up costly nothing wrong with a well done flat roof

Is a flat roof cheaper than a pitched roof?

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