Extensions and loft conversions in Guildford
Guildford is a Surrey borough with a historic county town at its centre and a wide rural hinterland of villages. Around the town centre and in Charlotteville the Victorian and Edwardian terraces and villas take the classic moves: a rear or side-return extension to create a kitchen-diner, and a rear dormer to add a bedroom and bathroom in the roof. In Stoughton, Burpham and Merrow the 1930s semi dominates, and the typical project is a two-storey side extension over a garage, a 4–6 m rear extension, a hip-to-gable loft with a rear dormer, or a garden room. Onslow Village’s garden-suburb houses sit on generous plots but under tighter controls. In East Horsley, Effingham, Ripley and Send the larger detached houses and village cottages more often want a two-storey rear extension, a wraparound or a substantial garden studio, usually in the Green Belt. Flats in the town centre have no householder permitted development (PD) rights at all.
Where the house is outside a conservation area and any Article 4 area, much of this is PD and we secure a Lawful Development Certificate (LDC) as proof. Because most of the borough beyond the town is Green Belt, and the Surrey Hills National Landscape lies to the south, a planning application designed to the council’s guidance is the norm on village plots, and we check the constraints map for every address before recommending a route. We are based in London and work across Guildford as a matter of course, as we do in Woking and Epsom and Ewell next door.
Planning constraints in Guildford
- Green Belt across most of the borough outside the town and the larger villages, where extensions must stay proportionate to the original house.
- Surrey Hills National Landscape on the downs and wooded slopes south and east of the town, where landscape impact carries great weight.
- Conservation areas in Guildford town centre, Charlotteville, Onslow Village and many village centres, where roof extensions lose PD rights, and an Article 4 direction understood to cover the Onslow Village estate.
- Thames Basin Heaths Special Protection Area around Ash, with a 400 m exclusion zone and a 5 km mitigation zone for new dwellings.
- Flood risk along the River Wey through the town centre, Shalford, Send and Ripley.
- Listed buildings in the town centre and throughout the villages.
If you are unsure which of these touch your plot, the council’s constraints map is the place to start, or ask us to check as part of your quote.
What Guildford planning officers look for
Officers assess householder applications against the Guildford Borough Local Plan: Strategy and Sites, the Development Management Policies and the council’s guidance on residential extensions. On the semis they look for side extensions set back from the front elevation and down from the ridge, with a gap kept to the boundary; rear extensions that clear the 45-degree line to the neighbour’s nearest habitable window; and dormers that are subordinate, set back from the eaves and clad in matching tile. In Onslow Village and Charlotteville the character appraisal governs materials, roof form and what happens to the frontage.
Green Belt is a real theme here. National policy allows an extension to a house in the Green Belt only where it does not result in disproportionate additions over and above the size of the original dwelling, meaning the house as first built or as it stood in 1948. Councils usually read this as a percentage of the original floorspace or volume, counting every extension since, so a village house that has already been extended once may have little headroom left. Outbuildings face a stricter test: a garden room or annexe is judged on whether it preserves the openness of the Green Belt, not just on proportion, so size, siting and use all matter. Inside the Surrey Hills National Landscape, visibility from public viewpoints and the choice of materials are tested on top of this. We check the original footprint and the council’s policy wording before drawing anything.
Terracing effects from side extensions, full-width box dormers and disproportionate Green Belt additions are the standard refusals. Guildford offers paid pre-application advice, which we recommend for Green Belt, Surrey Hills and conservation area sites. Council fees from April 2025 are £528 for a householder application and £264 for a proposed-use LDC; verify before applying.
Our services in Guildford
- Planning documentation
- House extensions – side, rear and two-storey extensions on 1930s semis and village houses
- Loft conversions – hip-to-gable and rear dormer lofts
- Permitted development and LDCs
- Outbuildings and garden rooms – including the Green Belt openness test
- Feasibility studies and pre-application advice
- Building Regulations drawings
Example projects nearby
- Two-storey extension in Ealing – two-storey rear extension and side infill on a 1930s semi, the same house type as Stoughton, Burpham and Merrow
- Rear extension in Islington – full-width rear extension on a Victorian terrace in a conservation area, the Charlotteville house type
- Loft conversion in Richmond upon Thames – hip-to-gable and rear dormer on an Edwardian semi in a conservation area
Guides
Read Permitted development rights in London, Do I need planning permission for a rear extension? and Extending or converting a loft in a conservation area.
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