Design & Build

Tailored packages to suit your needs.

At Colwin we cover all aspects of design and build; whether you are planning a simple single storey extension or a new build home Colwin Group have the expertise to help you achieve your goal. We tailor our packages to suit your needs and can assist right through from planning and design to construction.

We are able to provide solutions in all cases of a complete home or office renovation; whether your property requires an extension, conservatory build or redevelopment, we cover all types of design and build solutions and services.

We have more than 35 years of experience in such projects and are proud to say we have some of the most technically advanced tradesmen in the market, that paired with our dedication to customer service provides the best customer experience all round.

Our services include:

  • Home & office renovations
  • Home & office extensions
  • Conservatory builds
  • Outbuildings

Colwin offer specialist design and build services around the UK with immediate response available in Essex (Chelmsford, Colchester, Basildon, Southend, Brentwood, Braintree, Harlow, Epping), Kent, Suffolk, Hertfordshire, Norfolk, London and Cambridgeshire.

If you have a project in mind please do contact us for a free property inspection.

We are proud experts in:

Planning drawings and applications

Site Investigation

Engineered design and drawings

Assured Foundations


12 year insurance backed guarantee on foundations at no extra cost

Call NOW: 01245 496 633Contact Us

Home & Office Renovations

Colwin construction are the professionals of choice when you are in need of home or office renovations. Our friendly and professional team will understand your requirements and deliver on your expectations. We offer bespoke packages to suit all projects with any budget. Our ethos is to keep fuss and mess to a minimum. Call our team now to discuss your project requirement.

Home & Office Extensions

Colwin construction cover all types of home and office extensions from small to large projects and the adaptation of existing buildings spanning from steel framework and traditional brick built structures. Our team of skilled and credited tradesmen have over 40 years experience and we are proud to have some of the most technically advanced tradesmen in the market.

Conservatories Builds

Is your conservatory too hot in the summer and too cold in the winter? Or suffering from damp issues? Colwins offer a cost effective solution that will convert your unusable space into an efficient and inviting family room that can be enjoyed all year round. Conservatives built over the last few decades all have the same common construction issues built with inefficient materials. Our design team will understand and guide your project from idea creation through to full planning. We are experts at installing roof lanterns, bi fold doors and lightweight roof structures that will save you money on energy and efficiency.


Construction of multi-use buildings are becoming very popular amongst homeowners as they offer extended space from the main property that may not require you to go through the traditional planning process. Our expert team will understand your requirements, consider your budget and guide you through the whole building process. Open communication and understanding your budget is key to a speedy and successful build.

Traditional timber stud frame work can be erected fast usually within a few days and can be insulated at the same time. Internal finishes range from plaster, timber cladding and showcase feature walls.

We offer a wide choice of external cladding for you to choose from, various timbers from softwood to hardwood, composite boards and metal finishes.

Roof structures can be pitched with lightweight tiles or flat with various modern covings that will stand up to any weathers. Our roof systems all come with a minimum 25 year guarantee all installed by qualified roofers.

Other Services

Our Accreditations