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Cornwall Extensions: Professional Building and Design Services

Planning a home extension in Cornwall? Our specialist team delivers full-service solutions, from architectural design and planning to high-quality construction. Whether you’re considering a single-storey extension, two-storey addition, or bespoke house extension, we bring your vision to life with craftsmanship, compliance, and care.

🛠️ Comprehensive Home Extension Services in Cornwall

At TDesign Solutions, we provide a full range of professional services for home extensions in Cornwall. From initial consultation and architectural planning to the final construction, our experienced team guides you through every stage of your project.


We create detailed architectural plans and high-quality 3D designs tailored to your needs, ensuring a clear vision of your bespoke extension before construction begins. Our services include obtaining all necessary planning permissions, managing the construction process, and offering interior design support if required. We focus on transparency and provide a binding quotation before any work starts, giving you complete financial peace of mind.

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🏗️ Seamless Home Extension Projects: Quality, Compliance, and Safety

Whether you are planning a single-storey extension Cornwall project or a two-storey home addition, we ensure all work meets or exceeds current building regulations and safety standards. We liaise directly with local councils for inspections and provide all necessary gas and electrical safety certifications.


Our goal is to deliver exceptional results that combine quality craftsmanship with full regulatory compliance, making your home extension project smooth, stress-free, and fully compliant with Cornwall’s building requirements.

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🏡 Why Choose Us for Your Extension in Cornwall?

Choosing the right team for your home extension in Cornwall is crucial. At TDesign Solutions, we provide a complete service for house extensions, managing every detail from design to completion. We specialise in creating innovative, functional spaces that reflect your lifestyle, whether you want a modern minimalist look or a traditional Cornish style.


We go beyond standard construction, ensuring every element of your extension is built to the highest standards. Our team maintains clear and open communication, providing regular progress updates and detailed reports so you’re always informed. For bespoke extensions Cornwall homeowners can trust, we combine expertise, craftsmanship, and personalised service to deliver outstanding results.

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💰 Competitive Pricing, Quality Materials, and Stress-Free Extensions

We understand that a home extension is a major investment, which is why we offer competitive pricing without compromising on quality. Our process includes a comprehensive quotation before work begins and guidance on selecting high-quality, sustainable materials that match your vision.


From eco-friendly insulation to energy-efficient systems, we incorporate modern solutions that improve comfort and reduce running costs while enhancing your home’s value. Our aim is to deliver house extensions in Cornwall that are stylish, functional, and built to last. Contact our Cornwall extension specialists today to discuss your project and turn your ideas into a beautifully crafted reality.

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⭐ Client Testimonials ⭐


trevaskis design solutions customer testimonials star rating

It was a pleasure to work with Rob who helped us plan our kitchen extension. He was very professional, responsive and flexible throughout the process and we would have no hesitation in using his services again.

Ben Perks

trevaskis design solutions customer testimonials star rating

Required help from Rob on planning and design issue's, good to say he's helped and consequently have followed through with a couple other designs that were pipe dream's but Rob has brought them to life ! Highly recommended

Claire Taylor

trevaskis design solutions customer testimonials star rating

Rob provided a great service in developing our plans for a single storey extension, which included guiding us through the planning process, developing professional drawings to submit for approval and arranging for structural designs. Throughout Rob was responsive, enthusiastic and hard working and I would recommend Trevaskis Design Solutions.

Craig Sullivan

trevaskis design solutions customer testimonials star rating

Rob has Been everything we would look for in an architect. Great vision, pragmatic and realistic, helpful, full of advice and very efficient. He helped us balance our vision for our extension with a healthy dose of realism to allow us to make the best decision for us. It’s a shame we are only extending once, because we’d definitely use his services again.

Gary Gray


Home Extensions in Cornwall FAQs – What You Need to Know


  • Do I need planning permission for a home extension in Cornwall?

    In Cornwall, planning permission requirements for home extensions depend on several factors, including the type, size, and location of the proposed work. While some extensions may fall under Permitted Development Rights, allowing certain works without full planning permission, others may require a formal application. It's essential to consult with a professional to determine if your project requires planning permission. 

  • How long does it take to complete a home extension in Cornwall?

    The duration of a home extension project in Cornwall varies based on its complexity. Typically, a single-storey extension may take between 6 to 8 weeks, while a two-storey extension could extend to 12 to 16 weeks. Factors influencing the timeline include design complexity, material availability, and weather conditions. 

  • What types of home extensions can you build in Cornwall?

    We offer a wide range of home extension options in Cornwall, including single-storey rear or side extensions, two-storey additions, kitchen extensions, conservatories, and loft conversions. Each project is fully tailored to your needs, blending seamlessly with your existing home and enhancing both space and value.

  • Can I live in my home during the extension work?

    Yes, it's often possible to remain in your home during extension work. However, it's important to discuss this with your builder to ensure that the project can be completed safely and with minimal disruption to your daily life. 

  • What are Permitted Development Rights for home extensions in Cornwall?

    Permitted Development Rights allow certain types of home extensions to be carried out without the need for full planning permission. These rights are subject to specific conditions and limitations, such as size restrictions and the nature of the property. It's crucial to verify whether your proposed extension qualifies under these rights. 

  • What building regulations must my extension comply with?

    All home extensions must adhere to building regulations, ensuring safety and structural integrity. These regulations cover aspects like foundations, structural stability, fire safety, and energy efficiency. Our team ensures that your extension complies with all relevant building regulations. 

  • How can I ensure my extension complements my existing home?

    To ensure your extension blends seamlessly with your existing home, consider factors like architectural style, materials, and colour schemes. Our design team works closely with you to create an extension that enhances your home's aesthetics and functionality.

  • What is the process for completing a home extension in Cornwall?

    The process for a home extension in Cornwall begins with an initial consultation to discuss your requirements and ideas. From there, we create detailed architectural plans and secure any necessary planning permissions or building approvals. Once approved, our team manages the construction process, keeping you updated throughout. On completion, we conduct final inspections to ensure every detail meets our high standards and your expectations, delivering a smooth, stress-free experience from start to finish.

Extension & Conversion Specialists in Cornwall

Our services include architectural drawings, submitting planning regulations, and providing comprehensive building services for conversion and extension projects in Cornwall, including:


  • Loft (dormer) conversions
  • Barn conversions
  • Attic conversions
  • Kitchen extensions
  • Mill conversions
  • Garage conversions
  • Rear home extensions
  • Second or multi-storey extensions
  • Wrap around home extensions
  • Kitchen extensions
  • Outbuildings, garages and conservatories

If you’re planning an extension or conversion for your home, TDS is your comprehensive solution, managing every aspect of the project from start to finish. We handle the complete range of building services, ensuring a seamless process from initial planning and design through to the final construction.


Our services include creating detailed architectural drawings, providing expert advice on planning regulations in Cornwall, and managing all stages of the build. We work closely with you to transform your vision into a reality, handling everything ourselves to ensure high-quality results.


Finding a reliable company for both building and design services can be challenging. At TDS, we stay current with the latest planning and building regulations, fully understanding the unique requirements for extensions and conversions in Cornwall.



Based near Falmouth, we offer our complete range of building services for extensions and conversions across Cornwall, including Truro, Newquay, and St Austell.

CORNWALL’S TRUSTED BUILDING EXPERTS FOR BESPOKE AND QUALITY HOME EXTENSIONS

With years of experience in construction, design, and project planning, we specialise in creating exceptional home extensions across Cornwall. Our expert team ensures every extension meets the highest standards, delivering bespoke spaces that are functional, durable, beautifully designed, and perfectly tailored to enhance your unique vision.