Elmbridge covers Cobham, Esher, Claygate, Oxshott, Hersham, Walton-on-Thames, Weybridge, Thames Ditton and East and West Molesey. Whichever of them you live in, Elmbridge Borough Council decides your application. It is a borough of large family houses, private estates and riverside streets, and its planning rules reflect that.
This guide explains which documents Elmbridge uses, what its Design Code asks of a householder application, and the setting issues that come up most: Green Belt, conservation areas, flood risk and the private estates.
From 1 April 2027, Elmbridge joins Epsom and Ewell, Mole Valley, Reigate and Banstead and Tandridge in the new East Surrey Council, which takes over planning from Elmbridge Borough Council. Elmbridge’s documents are expected to carry across until East Surrey Council adopts its own plan, and a permission you already hold stays valid.
The plans your application is judged against
- The Elmbridge Core Strategy (2011). The borough’s main strategic plan.
- The Development Management Plan (2015). Adopted in April 2015, this holds the detailed policies used on everyday applications, including design and amenity.
- The Elmbridge Design Code (2024). Adopted as a supplementary planning document on 17 April 2024. For applications made since January 2025 it has replaced the older Design and Character guidance, and the council expects householder applications to include a Design Code checklist.
A replacement local plan was withdrawn from examination in February 2025 after the Inspector found the earlier draft unsound, and the council has started again. So the 2011 and 2015 documents will be the starting point for householder decisions for some time yet.
What the Elmbridge Design Code asks
The Design Code asks the questions any good design should already answer, but it asks them explicitly, and the checklist means you have to show your working.
Character of the street. Does the extension respond to the street it sits in? Elmbridge ranges from Victorian terraces in the Moleseys to large detached houses in Oxshott and Cobham, and the right answer differs.
Subordinate additions. Is the extension clearly secondary to the original house, in height, width and set-back?
Gaps and spacing. Does it keep a sensible gap to the boundary? Side extensions that close the spaces between large houses are one of the commonest reasons for refusal here.
Neighbours. Does it leave the neighbours with their light, outlook and privacy?
Most householder refusals in Elmbridge come down to bulk. Big houses on generous plots invite big extensions, and the council looks hard at two-storey additions that overpower a neighbour’s garden.
The setting: Green Belt, conservation areas, flood risk and private estates
Green Belt. Much of the open land between the settlements, around Cobham, Oxshott, Downside and Claygate, is Green Belt. Extensions there are judged on whether they are proportionate to the original dwelling, the house as first built or as it stood in 1948, with earlier additions counted.
Conservation areas. The borough has 25, including the historic centres of Cobham, Esher, Weybridge and Thames Ditton, and Kent Town in East Molesey. In a conservation area, permitted development is narrower, and materials, rooflines and front elevations matter more.
Flood risk. The Thames, the Mole and the Ember run through the borough. Parts of East and West Molesey, Thames Ditton, Walton and Weybridge, and land along the Mole at Cobham, are in flood zones 2 and 3. If your home is in one, a householder application needs a flood risk assessment, and floor levels and flood resilience become part of the design.
Private estates. St George’s Hill in Weybridge, Burwood Park in Hersham and several other estates have their own covenants and estate approval processes on top of planning. Planning permission alone may not be enough, so check your deeds and the estate’s rules before design starts.
Permitted development in Elmbridge
Within national limits, some extensions need no planning application. As the rules stand in late 2026:
- single-storey rear extensions up to 4 metres deep on a detached house, or 3 metres on others, with no prior approval;
- larger rear extensions, up to 8 or 6 metres, through prior approval;
- loft conversions of up to 40 cubic metres on terraced houses, or 50 cubic metres on others, with no dormer facing the road;
- single-storey side extensions up to half the width of the original house.
In Elmbridge, many homes have already been extended at least once, and permitted development is measured against the original house, so earlier work may have used the allowance up. Rights are narrower in conservation areas and were removed on some estates by condition. A lawful development certificate from the council confirms the position. Can you extend an existing extension? is worth reading if your house has grown before.
Making an application in Elmbridge
Pre-application advice. Elmbridge Borough Council offers paid pre-application advice for householder extensions and alterations. The householder service includes a site visit and a written response, but no meeting. Check the current fee on the council’s website.
Validation. As well as the national requirements, include the Design Code checklist. In a flood zone, include the flood risk assessment. In a conservation area, add a short heritage statement. Missing any of these is the usual reason an application is held up before the clock starts.
Timescales. The statutory target for a householder decision is eight weeks from validation.
Our work in Elmbridge
In East Molesey, with Martin Swatton Design, we reworked a poorly built earlier extension that had left a heavy block column in the middle of the kitchen. We took out the awkward structure, set new steel beams within the depth of the floor so the ceilings are clean and flat, and added a new rear extension clad in bronze metal, with a window seat and shelving for a large record collection. You can see the East Molesey extension on its project page.
There is more about our work across the borough on our Cobham, Esher and Elmbridge page.
The houses we see most often in Elmbridge
Large family houses in Cobham, Oxshott and Esher. Often extended more than once, with rooms at the back that grew in stages and no longer work together. The answer is rarely more floor area; it is usually reorganising what is there.
Victorian and Edwardian houses in the Moleseys and Thames Ditton. On narrower plots, where a side return or a rear extension is the obvious move and the detail of brickwork and roofline decides whether it looks right.
1930s semis and detached houses in Hersham, Walton and Claygate. A small, dark kitchen at the back, a dining room nobody uses and a loft with room in it.
After planning: the steps people forget
Planning permission is only the first approval. Before building starts you will also need:
- Building regulations approval. This covers structure, fire safety, insulation, ventilation and drainage. You can use the local authority building control service or a registered building control approver. Planning drawings are not enough to build from: the structure, the details and the specification need working out first.
- Party wall agreements. If the work involves a shared wall, or digging foundations close to a neighbour’s, the Party Wall etc. Act 1996 requires you to serve notice on them. Leave time for it, because a neighbour can take several weeks to respond.
- Planning conditions. Many Elmbridge permissions come with conditions, such as matching materials or obscured glazing to side windows. Some must be discharged before work starts.
Sorting these in the right order is what keeps a project on programme once the planning decision arrives. Planning permission vs building regulations explains the difference.
How we approach an Elmbridge project
Many Elmbridge homes have been extended before, so we start with the history: what the original house was, what has been added, and what that means for permitted development or Green Belt proportionality. We check the flood zone, the conservation area and, where it applies, the estate’s own rules.
Then we test the scheme against the Design Code, so the checklist supports the application rather than exposing weaknesses. In our experience, the fix for a risky Elmbridge scheme is usually not more floor area but a better arrangement of what is there.
The Clarity Pack does this before design, together with the structure and likely cost bands, so you know what is realistic before you commit.
Questions people ask about planning in Elmbridge
What is the Elmbridge Design Code? The council’s design guidance, adopted in April 2024. Since January 2025 it has replaced the older Design and Character guidance, and householder applications are expected to include a checklist showing how the scheme responds to it.
Do I need a flood risk assessment in the Moleseys? If your home is in flood zone 2 or 3, yes, and parts of East and West Molesey are. The Environment Agency’s flood map for planning shows the zone for your address.
My house is on a private estate. Is planning permission enough? Often not. Estates such as St George’s Hill and Burwood Park have their own covenants and approval processes on top of planning.
Who will decide my application after 1 April 2027? East Surrey Council. A permission you already hold stays valid.
Where to start
The free 15-minute Clarity Call is the first step. We’ll talk through your home, its history and planning position, and whether the Clarity Pack would help. For the general rules, see do I need planning permission for an extension?
