Which is best: A pitched or flat roof extension?


Are you planning a home extension? If the answer is yes, then you’re probably considering what roof to include, whether that be pitched or flat. Like a lot of decisions you’ll be making when renovating your home, this is a big one and something that often requires a lot of thought, with there being an array of physical and practical benefits to both roof types.

Here at Keenan Project Designs, we understand how overwhelming it can be, making so many important decisions, that could have a huge impact on the design, style of your renovation. We’re here to support you throughout your renovation journey and that’s why our team or experts have created this handy guide of the pros and cons on each type of roof extension, to ensure you choose the style that suits your needs and requirements.


A huge factor at the back of everyone’s mind who is renovating their home is cost because after all, everyone has a budget.

It might not come as any surprise that pitched roofs cost more, due to them involving more work and taking more time to build. Flat roof extensions take up less material and are quicker to create.

So, if you’re looking for a more budget-friendly option, then you’ll probably find yourself leaning towards a flat roof extension. However, before you rush to make a decision, it’s worth considering the below factors.

The look

The main difference between the look of the two styles is that pitched roof extensions are often considered more traditional, while flat roofs are deemed more contemporary.

It’s worth noting though, that the style of pitched roof extensions doesn’t always lend themselves to every design of house. A good example of where pitched roof extensions won’t work, is if you’re renovating a bungalow, in which case, choosing a flat roof extension might be your only option.


Simply put, pitched roofs tend to have a longer lifespan than flat roof extensions. As pitched roofs are on an angle, there is less chance of water pooling on them, which not only improves their life span but also reduces the risk of leaks.

Don’t be too put off by this though, the word ‘flat’ doesn’t mean entirely ‘flat’, with flat roof extensions being built on a slight angle, so you’ll avoid huge pools of water collecting.


Pitched roof extensions are known to let in more natural daylight, due to their angled design. Not only can this make the space inside seem bigger, but it can reduce electricity costs too.

If you’re really keen to get incorporate that natural lighting effect but are on a budget, then don’t worry, flat roofs can accommodate this. Flat rooflights and roof lanterns can be installed in flat roof extensions and both offer ways to include natural lighting at a more cost-effective price.


Due to the design of pitched roofs, you will gain more space than if you have a flat roof extension. Plus, if you think you might add a loft extension in the future, then you’ll be best to go with a pitch roof extension, or else you risk having to make some costly big alterations in the future.

Whether you opt for a pitched roof extension or flat roof option, then be sure to contact Keenan Project Designs. Our friendly team of experts can discuss your development and support you in better understanding your design options. Contact us and we’ll be happy to advise you further. Not only are we a RIBA Chartered Practice, but we also offer a company ethos of being reliable and trustworthy, with a focus on quality. Our services span Warwickshire and beyond, including RugbyCoventryLeamington SpaKenilworthNorthampton and Solihull.

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