Regions we cover
LINX Design & Build designs and builds home extensions, loft conversions, renovations and new homes across Surrey, from its office in Cobham. One in-house team handles the architecture, the planning approvals and the construction, including projects in the Green Belt and the Surrey Hills National Landscape. Every project starts with a free survey and a fixed-price quote.
Tell us about your project — we'll come back with next steps and a time for a free survey.
Design & build
Surrey has 11 district and borough councils, and much of the county lies in the Metropolitan Green Belt, so the size of an extension is often judged against the original house as well as against permitted development limits. The Surrey Hills National Landscape adds further design controls across much of the North Downs and the Greensand Hills.
From our Cobham office we work across Elmbridge, Guildford, Waverley, Mole Valley and the rest of the county, on everything from 1930s semis in Epsom and Ewell to large detached houses on private estates. Some of those estates have their own covenants or estate rules alongside the planning system, which need checking before design starts.
Surrey's housing ranges from Victorian villas and Edwardian semis near the railway towns, through the 1930s semis of Epsom, Ewell and the A3 corridor, to Arts and Crafts houses, tile-hung cottages and Bargate stone buildings around Godalming and Haslemere. Large detached houses around Cobham, Oxshott, Weybridge and Virginia Water often suit two-storey extensions and full remodelling, while 1930s semis suit hip-to-gable loft conversions and wrap-around extensions.
Our services
Our architects design for Surrey's mix of Green Belt, conservation-area and private-estate settings, balancing the brief against what each council will accept.
Find out more 02We prepare applications to all 11 Surrey councils, including Green Belt cases where the design has to stay proportionate to the original house.
Find out more 03Single and two-storey rear extensions, wrap-arounds and side extensions suit Surrey's semis and detached houses, and we confirm early whether permitted development or a full application applies.
Find out more 04Hip-to-gable and rear dormer loft conversions suit 1930s semis across Epsom, Ewell and Woking, while dormers in the Surrey Hills or a conservation area need planning permission.
Find out more 05We renovate period cottages, Arts and Crafts houses and large family homes, including listed buildings where listed building consent is required.
Find out more 06We design and build replacement dwellings, which in the Green Belt must not be materially larger than the house they replace, and new houses on suitable infill plots.
Find out morePlanning
How it works
We visit, measure up and talk through what you want to build and what the site allows.
Our in-house team draws the scheme and handles planning or a Lawful Development Certificate, plus Building Regulations.
You get an itemised, fixed price in writing before any work starts.
One team builds it, keeps you updated weekly and hands over with a 10-year structural guarantee.
800+ projects completed since 2017 · 4.9★ from 500+ reviews · See our starting prices
Questions
Yes, in most cases, but an extension that needs planning permission must not be a disproportionate addition to the original building. Each Surrey council interprets this through its own guidance, usually by comparing the extended house with the house as originally built or as it stood in 1948. Permitted development rights still apply in the Green Belt unless they have been removed, so a modest rear extension may not need an application at all.
Usually not, if the house is outside a conservation area and the Surrey Hills National Landscape. Under permitted development, a loft conversion can add up to 40 m³ to a terraced house or 50 m³ to a semi-detached or detached house, with dormers kept off the roof slope facing the road. In conservation areas, in the Surrey Hills and for flats, you need planning permission. A Lawful Development Certificate confirms the position before building starts.
Usually, but there can be an extra layer of approval. Some private estates in Elmbridge have covenants or estate rules that require the estate's consent for extensions, separate from planning permission, and some newer houses had permitted development rights removed by condition. Otherwise, a single-storey rear extension to a detached house can usually extend 4 m under permitted development, or 8 m with prior approval. We review the planning history first, and your solicitor can confirm any covenants.
We price each Surrey project individually and give a fixed-price quote after a free survey, rather than quoting a rate per square metre. The price reflects the design, the structure of the existing house, ground conditions, access and the specification you choose. Surrey-specific factors, such as Green Belt design limits, flood-risk measures near the Thames or matching materials in a conservation area, are included in the quote from the start.
Householder applications to any of Surrey's 11 councils have an 8-week statutory determination period from validation, and prior approval for a larger single-storey rear extension is decided within 42 days. Green Belt, conservation-area and listed building cases can take longer where the council asks for changes. Building Regulations approval and any party wall agreements usually run alongside. We confirm the build programme once the design and approvals are settled.
Yes. From our office in Cobham we take on projects across all of Surrey, including Guildford, Woking, Epsom, Leatherhead, Dorking, Reigate, Farnham, Godalming, Haslemere and Camberley, as well as Esher, Oxshott, Claygate, Weybridge and Walton-on-Thames closer to the office. Each project starts with a free survey at the property, followed by a fixed-price quote from our in-house team.