DIY Home Extension Kit FAQs

Investing in a DIY home extension kit can be daunting, so it’s only natural to have some questions about the design and installation process. To help you out, we’ve answered some of our most commonly asked questions below.

If your question hasn’t been covered, don’t hesitate to get in touch online or call us on 01202 399999 – we’re happy to help!

Will I need planning permission for a DIY home extension?
In most cases, you won’t need to apply for planning permission when building a DIY extension. This is because most extensions fall under permitted development rights. There are some exceptions to this, so it’s a good idea to consult with your local authority body first – they’ll be able to advise you if planning permission is necessary, and if so, can guide you through the application process.
Are your DIY home extension kits building controls approved?
Good news! All of our extension kits have received building controls pre-approval from a nationally accredited building control approvals agency. They’ve undergone rigorous testing, including detailed analysis and verification of the roof system using independently sourced structural calculations. They were also assessed for thermal performance and condensation risk analysis, which resulted in us being granted with System Approval.
How much do your DIY home extension kits cost?
One of the biggest advantages of DIY extensions is the price; our kits start at only £1,200 per square metre (with any style roof), which is tens of thousands less than the cost of a traditional extension.

As each Trade Price Warmer Living extension kit is made bespoke for the home it’s being fitted onto, the exact price can vary considerably – a large, more complex design will cost more than a simpler one, and vice versa.

Do I need to be an experienced builder to install your DIY extension kits?
Not at all – in fact, our kits are specifically designed to be beginner friendly! We provide clear, step-by-step instructions for what you need to do next, so you can have your extension up and ready for use in no time. We also include all you need to complete your build in one package, so you don’t need to worry about buying bricks or extra building materials.

You can see just how easy installation is by watching our demonstration video!

Which roof styles can my DIY extension have?
We have six different pitched and flat roof options to choose from:

Lean-to side hipped
Edwardian double hipped
Flat roof

All of our roofs are built with Warmer Roof technology. Their innovative honeycomb design provides the highest level of insulation of any roof on the market, keeping your home cosy in the winter and cool in the summer.

Can I pay for my DIY extension on finance?
Yes! We’ve received authorisation from the FCA, which means we can offer you advice on various financing options, including our Buy Now, Pay Later scheme. Our team is always here to guide you through the available financing alternatives, so you can choose the best option that meets your needs and budget.

We can explain more about our finance options during our initial consultation, so feel free to get in touch today!

Why choose a DIY extension over a traditional extension?
There are countless reasons to choose a DIY home extension over a traditional one, including:

Thousands saved in installation fees
Greater design flexibility
Quicker completion time
Longer warranty
A sense of satisfaction from doing it all yourself!

Will my DIY extension be covered under warranty?
Yes! Our extensions are covered by a 10-year product guarantee that’s comparable to even the NHBC new build warranties. It covers every aspect of your extension, from the materials used to the construction itself. You can have peace of mind knowing that your investment is protected for years to come.


As an FCA-authorised provider, we take great pride in offering our customers not only exceptional products but also flexible financial solutions. Our tailored advice on a range of financing options, including the popular buy now, pay later scheme, ensures that you can secure your dream home extension with ease and confidence. Call us today for a comprehensive consultation.

DIY Home EXTENSIONS made easy

Our home extensions kits will be delivered to your door in as little as 3 weeks, along with a step-by-step installation guide to make building them quick and easy.


The Warmer Roof system you’ve chosen stands as a testament to quality and durability, having undergone rigorous independent testing and analysis. This thorough evaluation was conducted by a nationally recognised and accredited building control approvals agency, ensuring that your Warmer Roof meets current Building regulations.