House Extensions in Guildford, Farnham,
Godalming and All Surrounding Areas

House extensions are typically built to create larger, open-plan living spaces. The Onyx Contractors team can connect your indoor and outdoor space, fitting compact and spacious extensions. We oversee projects from the first brick to the last wall and beyond. With many years of industry experience, our team has the knowledge and skills to advise you during the planning and design stages before building your extension. 

Alongside home extensions, our builders undertake many building services in Farnham, Guildford, Godalming and the surrounding Surrey areas we cover. We also operate as groundworks contractors providing specialist foundation installations. Please read our testimonials to see what our previous clients say about their quality extensions.

One of the best ways to lower your carbon footprint is to ensure your property uses energy efficiently. Areas we can focus on during a house extension include:

  • Lighting

  • Heating

  • Insulation

  • Appliances

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Types of Home Extensions

Groundworks are the first stage of construction. These works prepare the area of land you’ve designated for building. During this process, our builders lay the foundations for a stable structure. Following the brickwork stage, they will install a roofing and guttering system, blending the tiling, fascias and soffits with the existing materials at your Farnham or Alton property.

Side-Return Extensions

If you have an unused alleyway, side-return house extensions are an ideal way to utilise the space. You may opt for our builders to install an extra bedroom, utility room or office space. These usually measure half the width of the existing structure, or less, thus negating the need for planning permission.

Rear-Facing Extensions

Rear-facing home extensions are also a popular choice. They significantly expand key living areas such as your kitchen, dining room, or sitting-room space. Bi-folding or sliding doors can integrate the extension with your outdoor area, bringing natural light and fresh air into the home.

Single-Storey and Double-Storey Extensions

At Onyx Contractors, we can build double- or single-story extensions upon request. We specialise in working with new builds, period properties and summerhouses.

Wraparound Extensions

Our team can construct wraparound home extensions and assist you with planning permission applications in Farnham, Guildford, Godalming and the surrounding Surrey areas. Our builders fit these L-shaped extensions to the rear and side of your property to extend narrow spaces into larger kitchens and extra rooms or connect the living space to your garden.

Interior Works

Building house extensions is only one part of the job, our builders also cover the interior. Fitting windows and doors to match the existing theme is important for a visually pleasing finish. We also manage new gas, electric, and plumbing installations so that you can take full advantage of the additional space.

The Onyx Contractors team undertakes plastering, rendering, painting and decorating. Flooring will be fitted, as well as tiling for your new walls. Our bespoke carpentry and joinery services mean our builders can design and assemble furniture, cabinets and units to suit your needs.

Call us on 08000 622569 or 07825 185352 to discuss the house extensions our building company provides in Godalming, Guildford, Farnham and the surrounding areas.

TELEPHONE: 0800 0622569
                        07825 185352

BASED IN: Farnham



Onyx Contractors is a proud member of the Federation of Master Builders (FMB). All FMB members must:
Onyx Contractors can offer you a contract on your work and a warranty from FMB Insurance Services, assuring you of a better building experience.