Planning a house extension

We’ve got 30 years of experience of getting new projects like yours off the ground.

At Culmex Construction we’ve been helping home owners bring their new ideas to life for generations. Thanks to our comprehensive and detailed design and build experience, we’ve got expert advice to share on every aspect of your extension project – from navigating building regulations to ways to controlling your costs. All without turning your life upside down!

Trust us to turn your vision into an affordable, high quality result

Whether you’re well down the road with plans and permissions or you simply need an early, expert sounding board, our seasoned and friendly team can help you find the shortcuts, spot the pitfalls and generate brilliant new ideas. Contact us today for a free, on-site consultation and estimate.

To book yours, call us on 01884 255587. Better still, please give us a little more detail on your plans by completing the contact form below.

Request your free on-site consultation – we’ll be in touch within 24 hours

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We would highly recommend using Culmex Construction... Mat and his team worked with us to ensure that the work was finished efficiently and to a very high standard. From day one the level of communication and attention to detail was exactly what we were looking for... We are super happy with the finished result.

Mat and his team did a fantastic job on our extension. Communication was great, the team were all so helpful, polite and very trustworthy and Mat had everything under control... We had no unexpected costs and Mat kept us informed every step of the way. We would definitely recommend the team at Culmex Construction Ltd.

Frequently Asked Questions

How much does a house extension cost in Devon?

The cost of a house extension in Devon depends heavily on scope, design, materials, structural work, site access, and finishes. At Culmex Construction we offer turnkey design and build services including support with architectural design, planning applications and full project management – so our quotations will be always be comprehensive and transparent – with no surprise extras.

Because every property is different, we strongly recommend you request a site survey and free quotation from our team. We can then provide a detailed, bespoke cost estimate.

How long does it take to build a house extension?

The duration of constructing a house extension depends on factors like size, complexity, structural alterations, finishes, and site conditions. At Culmex, we manage the process end-to-end (from design through to completion) to keep things as efficient as possible. We will provide a project timeline up front and keep you regularly updated at every stage.

Will a house extension add value to my house?

Yes, a well-designed, quality-built extension usually brings a strong return on investment. By increasing usable space (e.g. extra living areas, kitchen-diner extensions, additional bedrooms), you can make the property more attractive to buyers.

At Culmex Construction we deliver high standards through experienced project management, quality subcontractors and attention to detail. This ensures seamless integration with the existing structure and style, which could mean your extension is more likely to appeal to future buyers.

Precise uplift depends on location, the type of extension and the market.

Do I need planning permission for a house extension?

This depends on the type of extension, your property’s status, and local planning rules in Devon. At Culmex we offer support with architectural design and planning application services.

Key points to consider:

Some extensions fall under Permitted Development rights (i.e. you may not need full planning permission), depending on size, height, position, and other constraints.
For more substantial extensions or if you’re in a conservation area or listed building, you’ll likely need full planning permission.
We assess each project and advise whether planning permission is required, preparing and submitting all necessary documentation.