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House extension with bi-folding glass doors and multiple windows

Your Go-To For House Extensions In Durham!

Need more room to breathe? Dreaming of a bigger kitchen, a dedicated work area, or a playroom for the kids? Here at DH1 Design and Build Ltd, we specialise in creating beautiful and functional house extensions that perfectly suit your needs, style, and budget. Our experienced team will guide you through the planning permission process (if required) and create detailed plans for your extension. We'll keep you informed throughout the process, with a dedicated point of contact to address any questions or concerns.

With over 24 years of experience serving Durham, we know how to navigate any project. Contact us today for a free consultation and quote!

Our Comprehensive Services

Loft Conversions

Unlock the potential of your unused loft space and create a dedicated bedroom, home office, or additional living area. From extra bedrooms to a new office, a loft conversion gives you the room you need for whatever life throws your way.

Barn Conversions

Restore and convert a charming barn into a unique and stylish living space - we have extensive experience navigating planning considerations for barn conversions. Every family and every extension we build is unique. Tell us what you dream of, and we’ll make it a reality.


Bring the outdoors in with a beautiful, light-filled conservatory, perfect for relaxing or entertaining. Our qualified and insured builders will handle all aspects of the construction, delivering exceptional workmanship on time and within budget.

A conservatory in a house next to a garden, with a table and chairs
Newly built kitchen with white furniture

Home Improvements

We handle many home improvement projects, from kitchen and bathroom refurbishments to plastering and electrical work. Not only does an extension give you more space, but it also adds value to your property. It’s an investment in your home’s future.

Building Plans And Building Regulation Submissions

Our experienced team can guide you through the planning permission process and ensure your project adheres to all relevant building regulations. 

Car Ports

Provide weather protection for your vehicle with a practical and stylish carport. We'll ensure your extension adheres to all relevant building regulations for a safe and compliant project.

Drawing Plans

Whether you're planning a residential, commercial, or industrial project, our team of experienced professionals will work closely with you to create precise and visually appealing plans that meet your requirements and specifications.

What this covers

Initial Consultation: We begin by discussing your project requirements, objectives, and budget during an initial consultation. This helps us gain a clear understanding of your vision and allows us to outline the scope of work accordingly.

Concept Development: Based on the information gathered during the consultation, our team develops preliminary design concepts and sketches for your review and feedback. We work closely with you to refine these concepts until they align with your vision.

Design Refinement: Once the initial concepts are approved, we proceed to develop detailed architectural drawings, including floor plans, elevations, and sections. Throughout this stage, we continue to collaborate with you to ensure that the designs meet your expectations.

Finalisation: After incorporating any necessary revisions, we finalise the architectural drawings and prepare them for presentation and approval. Our team ensures that the plans are accurate, comprehensive, and ready for further stages of the project, such as permitting and construction.

Close-up of Architect engineer drawing plan on blueprint with architect equipment

Contact Us On 0191 367 0696 To Discuss Your House Extensions Project!

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