House extensions Sussex require a carefully considered architectural approach to ensure quality, functionality and long-term value.
Whether you are planning a rear extension, side return extension or double-storey addition, we provide a fully integrated architectural and structural service, ensuring clarity from concept through to construction.
House Extensions in Sussex – Architectural Services
Our experience in house extensions Sussex projects allows us to deliver tailored architectural solutions for a wide range of property types.
We design and deliver bespoke residential extensions tailored to each property and client requirement. Our approach balances spatial quality, natural light and structural integrity.
- Rear Extensions
- Side Return Extensions
- Wrap-Around Extensions
- Double-Storey Extensions
- Kitchen Extensions
- Structural Alterations & Open-Plan Reconfigurations
Our Extension Design Process
Our approach to house extensions in Sussex focuses on clear coordination between design, planning and construction.
A successful house extension requires careful coordination between design vision, planning compliance and structural feasibility. Our structured process ensures a smooth journey from concept to construction.
- Initial Consultation & Site Assessment
- Concept Design & Layout Development
- Planning Permission or Permitted Development Review
- Technical Drawings & Structural Coordination
- Building Regulations Submission
- Construction Support & Site Guidance
Planning Permission for House Extensions in Sussex
Planning permission requirements for house extensions in Sussex vary depending on the scale, location and design of the proposed works.
Some extensions may fall under permitted development, while others require full planning approval. Understanding these constraints early helps avoid delays and ensures the design aligns with local planning policy.
We prepare and coordinate planning applications with a clear and structured approach, helping homeowners move forward with confidence.
You can also review official planning guidance on the UK Planning Portal.
Building Regulations for House Extensions in Sussex
All house extensions in Sussex must comply with building regulations to ensure safety, structural integrity and energy performance.
We prepare detailed technical drawings and coordinate with structural engineers to ensure compliance with current UK standards and smooth project delivery on site.
Why Choose STUDIO NINETY-THREE for Your House Extension?
Proven experience in delivering house extensions in Sussex across a wide range of property types
- Design-Led Residential Extensions
- Integrated Architectural & Structural Expertise
- Clear Guidance on Planning & Regulations
- Detail-Oriented Technical Drawings
- Experience Across Sussex Residential Projects
Areas We Cover in Sussex
We provide house extension design services across West and East Sussex, including Crawley, supporting homeowners with high-quality residential projects.
- Brighton & Hove
- Crawley
- Horsham
- Lewes
- Worthing
- Mid Sussex
Frequently Asked Questions About House Extensions
Do I need planning permission for a house extension in Sussex?
Some extensions fall under permitted development rights, while others require full planning permission. We assess your property and advise on the most appropriate route.
How much does a house extension cost in Sussex?
Costs vary depending on size, structural requirements and specification. We provide tailored guidance following an initial consultation.
How long does a house extension project take?
The design and approval stages typically take several weeks, followed by the construction period depending on complexity and scale.
Can you provide structural calculations for the extension?
Yes. We integrate structural design within our service to ensure compliance, efficiency and buildability.
Planning a House Extension in Sussex?
If you are planning house extensions Sussex, early architectural guidance can make a significant difference in the success of your project.
Book a consultation to discuss your house extension project and explore how thoughtful architectural design can enhance your home.
Well-designed house extensions in Sussex should not only improve internal space but also enhance the overall functionality and long-term value of the property.
A carefully planned approach ensures that the extension integrates naturally with the existing structure while meeting both design and technical requirements.