Habito Designs is a RIBA Chartered architecture practice designing house extensions across Guildford and the wider Guildford Borough. From single-storey rear extensions on Victorian terraces in Charlotteville to substantial double-storey wraparounds on detached homes in Merrow, we deliver extensions that genuinely transform how you live — not just add square metres. Our recent Oaktree Project in Guildford is a recent example of our work in the borough.
Guildford’s planning environment is more challenging than most Surrey boroughs — around 89% of the borough sits within the Green Belt, several conservation areas restrict design choices, and the council’s planning officers expect drawings to a high professional standard. A RIBA Chartered architect is your safeguard against costly planning refusals and Building Control rework. We are registered with the Architects Registration Board, follow the RIBA Plan of Work, and carry full professional indemnity insurance.
The most common extension type in Guildford. Typically used to create open-plan kitchen-dining-living spaces with garden connection. Many fall within Permitted Development (3m for terraces, 4m for detached, with the larger home extension scheme allowing 6m and 8m respectively, subject to Prior Approval). Conservation areas and Article 4 zones restrict PD.
Particularly suited to Victorian and Edwardian terraces in Stoke, Charlotteville, and the streets around Guildford town centre. Fills in the narrow side passage to substantially widen the kitchen. Almost always requires planning permission due to boundary proximity.
Combines a rear extension with a side return — the most transformative single-storey option for terraced and semi-detached homes. Creates large open-plan rear rooms with multiple aspect windows.
Adds bedroom and bathroom space above the new ground-floor extension. Generally requires planning permission. Common on detached homes in Merrow, Burpham, Worplesdon, and Onslow Village.
Most appropriate for detached and semi-detached homes with garage or driveway space to the side. Two-storey side extensions frequently used to add a master suite above an enlarged kitchen or family room.
The most ambitious extension type — combines side and rear additions on both ground and first floor. Substantial planning, structural, and budget implications. Best suited to larger detached homes.
2026 construction costs for Guildford extensions (excluding architect fees, VAT, and high-end fittings):
Architect fees typically 7–12% of construction cost. We provide fixed-fee quotes for feasibility, planning, and building regulations packages.
Our Oaktree Project in Guildford involved a contemporary single-storey rear extension to a 1930s detached home. The brief was to create a light-filled open-plan kitchen-dining space with seamless garden connection. The flat-roofed extension, clad in white render, contrasts with the original brick facade and opens to the garden through large sliding glazed doors. View the full Oaktree Project case study →
Green Belt policy permits 'limited' extensions to existing dwellings — broadly meaning extensions that do not result in disproportionate additions over and above the size of the original building. Original meaning the dwelling as it stood on 1 July 1948 (or as built if later). We test the maths against your specific property as part of the feasibility study before any design work begins.
Guildford has numerous conservation areas including Guildford Town Centre, Chilworth, Compton, Shere, Albury, and East Clandon. Extensions in these areas must respect the area's character, use sympathetic materials, and avoid disrupting the historic streetscape. Article 4 directions in some areas remove Permitted Development rights.
For any project larger than a standard rear extension, we recommend a pre-application enquiry with Guildford Borough Council. The fee is modest and the design feedback substantially improves first-time approval rates. We manage this process on your behalf.
| Extension Type | Usually PD? | Notes |
|---|---|---|
| Single-storey rear, ≤3m (terrace) / ≤4m (detached) | Yes | Subject to height & material rules |
| Larger Home Extension, ≤6m (terrace) / ≤8m (detached) | Yes (with Prior Approval) | Neighbour consultation required |
| Side return single-storey | Sometimes | Width and height restrictions apply |
| Two-storey rear extension | No | Always requires planning permission |
| Side extension two-storey | No | Always requires planning permission |
| Wraparound (any height) | No | Combination removes PD eligibility |
| Any extension in conservation area | No | PD restricted by designation |
| Any extension in Article 4 area | No | PD removed by direction |
| Stage | Duration |
|---|---|
| Feasibility study | 2–3 weeks |
| Design development | 3–4 weeks |
| Pre-application enquiry (recommended) | 4–6 weeks (Guildford Borough Council) |
| Householder application | 8 weeks (Guildford Borough Council) |
| Full planning application | 13 weeks |
| Building Regulations drawings | 3–4 weeks |
| Construction (single-storey) | 10–14 weeks |
| Construction (double-storey) | 16–24 weeks |
| Total (single storey, planning route) | 8–10 months |
| Total (double storey, planning route) | 10–14 months |
Contact us for a free, no-obligation consultation. We will visit your Guildford property, assess the extension potential, and advise on the best design route, planning strategy, and likely budget — at no cost to you
Many Guildford extensions fall under Permitted Development, but the Green Belt designation and conservation areas restrict PD in many parts of the borough. Always check via a feasibility study before assuming PD applies.
Green Belt policy permits ‘limited’ extensions that are not ‘disproportionate’ to the original dwelling. There is no fixed percentage — case law generally treats up to 30–50% volume increase as defensible, but every property is judged on context. Our feasibility study tests this against your specific property.
Usually yes. Rear extensions and side returns are common. If your property is in the Guildford Town Centre conservation area, additional design considerations apply — we manage this through pre-application discussions with the council’s conservation officer.
Well-designed extensions in the Guildford market typically return 70–110% of construction cost on resale. Kitchen-dining extensions and properties with added bedrooms perform best. Poorly designed or oversized extensions can detract from value.
Yes. We deliver every RIBA Plan of Work stage from feasibility through to construction management. One practice, one point of contact, no handovers.
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