Single-Storey Extensions in Surrey & Elmbridge
- 30 years experience
- 10-year structural guarantee
- Fixed fee quotation
- 5% Scheduling discount
- 500+ Successful projects
Add practical ground-floor space with a well-planned single-storey extension designed around light, flow, comfort and everyday family living.
Single-storey extension builders for Surrey family homes
A single-storey extension is one of the most flexible ways to improve a home. It can create a larger kitchen, open-plan dining space, garden room, utility area, home office or more practical family living space without adding another floor.
HWP Design & Build delivers single-storey extensions across Elmbridge, East Molesey, Esher, Thames Ditton, Surbiton, Kingston and nearby Surrey towns. We coordinate the design, planning route, structure, drainage, roof design, glazing, insulation, Building Regulations and finish specification.
Whether you are considering a modest rear extension, a side return or a larger kitchen extension, we help you choose a route that suits the property, garden, budget and long-term use of the new space.
Clear scope, fixed-price clarity and local accountability
HWP Design & Build is the trading name of SMA Design & Build Ltd. We combine over 30 years of hands-on industry experience with practical design thinking, insured delivery, tidy site management, quality finishing and aftercare support.
Learn more about our process, accreditations, insurance and guarantees, aftercare and customer reviews.
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Single-Storey Extensions in Surrey & Elmbridge:
HWP Design & Build provides single-storey extension design and construction across Surrey, Elmbridge and nearby South West London. We assess garden depth, boundaries, foundations, drainage, structural openings, roof form, glazing, planning, Building Regulations, access and finish specification before preparing a fixed-price quotation.
What type of single-storey extension is right for your home?
Single-storey extensions can solve different layout problems. The best option depends on your plot, budget, garden, planning position and how you want to use the space.
| Option | Best suited to | Typical benefit |
|---|---|---|
| Rear single-storey extension | Homes with enough garden depth behind the existing house. | Creates a larger kitchen, dining or family living space. |
| Side single-storey extension | Homes with underused side space or side access. | Adds width and can improve circulation, storage and layout. |
| Kitchen extension | Families wanting a better everyday cooking, dining and entertaining space. | Creates the practical heart of the home. |
| Single-storey extension with lantern | Homes where the middle of the plan needs more light. | Improves daylight and makes the new area feel more generous. |
| Single-storey extension with refurbishment | Homes where the existing ground floor also needs reworking. | Creates a more joined-up layout rather than a bolt-on room. |
Planning permission, permitted development and local design context
Many single-storey extensions can fall under permitted development where limits and conditions are met, but this is not guaranteed. Depth, height, boundary distance, materials, previous extensions, conservation context and local restrictions all need to be checked before relying on permitted development.
We can review whether your project is likely to need planning permission, whether a lawful development certificate is sensible, and how the design should respond to local expectations in Elmbridge, Surrey and nearby South West London.
- Permitted development checks for size, height, depth, boundary position and materials.
- Householder planning applications where the proposal exceeds permitted development limits.
- Conservation area, neighbour, daylight, overlooking and street-scene sensitivity reviews.
- Coordination between drawings, structural information, specification and build scope.
How much does a single-storey extension cost in Surrey?
Single-storey extension cost depends on footprint, foundations, drainage, structural openings, roof design, glazing, kitchen or bathroom specification, heating, electrics, finishes and how much internal reconfiguration is required. We avoid misleading headline prices because each property, scope and specification is different.
Once we understand the property and project brief, we prepare a clearer quotation based on real site conditions, drawings, specification, approvals and finish expectations.
| Cost factor | Why it affects the quotation |
|---|---|
| Extension size and footprint | A larger footprint increases structure, foundations, roofing, glazing, labour and finishes. |
| Foundations and ground conditions | Soil, trees, drainage and existing structures can affect engineering and build complexity. |
| Roof type and glazing | Flat roofs, pitched roofs, roof lanterns and rooflights all change cost and performance. |
| Structural openings | Large openings between the old and new areas require steelwork and careful sequencing. |
| Kitchens and utilities | Cabinetry, appliances, plumbing, drainage and electrics often drive a large part of the budget. |
| Finish specification | Flooring, joinery, lighting, heating, decoration and exterior materials affect the final price. |
For broader budget planning, read our Surrey house extension cost guide or our Elmbridge house extension costs, planning and timeline guide.
Our single-storey extension process
We use a clear process so design, approvals, pricing and construction remain joined up from the start.
What happens after you request a single-storey extension quotation?
We review your enquiry, arrange a suitable time to discuss the property, then assess layout, access, structure, planning route, Building Regulations, likely disruption and the level of finish required before preparing a clear scope.
Start your extension enquiryLocal extension considerations in Elmbridge and Surrey
Extension projects around East Molesey, Esher, Thames Ditton, Kingston, Surbiton, Walton-on-Thames, Weybridge and Cobham often involve established housing stock, neighbouring boundaries, drainage routes, mature trees, conservation sensitivity and restricted access. We review these points early so the design, quotation and programme reflect the real property.
| Area | Common consideration | How we approach it |
|---|---|---|
| East Molesey / West Molesey | Family homes, rear gardens, shared boundaries and KT8 planning context. | Early checks around access, drainage, party wall position, garden connection and buildability. |
| Hampton Court / Thames Ditton | Character homes, river-adjacent settings, conservation sensitivity and proportionate extensions. | Designs are tested for scale, materials, roof form, local character and site logistics. |
| Esher / Claygate | Larger family homes, specification-led projects and premium finish expectations. | Clear feasibility, design coordination and specification-led pricing before construction. |
| Kingston / Surbiton | Victorian, Edwardian and terrace-style homes with layout and party wall constraints. | Practical design around structure, services, neighbours, drainage and sequencing. |
| Walton-on-Thames / Weybridge / Cobham | Detached and semi-detached homes with scope for larger extensions and whole-home upgrades. | We coordinate design, specification, structural requirements and build programme as one managed route. |
Single-Storey Extensions in Surrey & Elmbridge across Elmbridge, Surrey and South West London
We are based near the Surrey and London border and regularly support homeowners planning extensions, loft conversions, refurbishments and full home improvements across the local area.
Key locations include East Molesey, West Molesey, Hampton Court, Thames Ditton, Esher, Claygate, Walton-on-Thames, Weybridge, Cobham, Kingston upon Thames, Surbiton, Teddington, Twickenham, Richmond and Wimbledon and nearby South West London.
Recent house extension project inspiration
Explore recent projects to see how different extension types, planning constraints, structural requirements and internal layouts can be approached.
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Useful house extension guides
Related house extension services
Planning a house extension? These related services help with approvals, structure, project coordination and wider home improvement work.
Single-Storey Extension FAQs for Surrey & Elmbridge Homeowners
Some single-storey extensions can fall under permitted development, but it depends on size, height, depth, boundary position, materials, previous extensions and whether local restrictions apply. We can advise on the safest route.
Rooflights, roof lanterns, glazed doors, internal openings and careful layout planning can all help bring natural light into the new and existing rooms.
Yes. We plan floor levels, thresholds, insulation build-ups and finishes so the transition between the existing home and new extension is as seamless as possible.
Yes, a properly designed extension should be insulated, ventilated and heated to modern standards so it is comfortable year-round.
Yes. We can coordinate survey, design, planning, Building Regulations, structural input, construction, finishing and handover through one managed route.
Often yes, but it depends on access, services, kitchen disruption and structural openings. We plan protection, sequencing and temporary arrangements before work begins.
Rear, side, kitchen and ground-floor extension planning.
Ready to price your single-storey extension?
Whether you are planning a kitchen extension, open-plan living space, garden room or full ground-floor transformation, we can assess your property, explain the best route and provide fixed-price clarity before work begins.
Single-Storey Extensions in Surrey & Elmbridge across East Molesey, Elmbridge, Surrey and nearby South West London.