Rear Extensions in Surrey & Elmbridge
- 30 years experience
- 10-year structural guarantee
- Fixed fee quotation
- 5% Scheduling discount
- 500+ Successful projects
Open up the back of your home with a rear extension that improves kitchen space, family living and connection to the garden.
Rear extension builders for brighter garden-facing living space
A rear extension is one of the most popular ways to create more space at the back of a home. It can add a larger kitchen, dining area, living space, playroom, utility zone or garden-facing family room.
HWP Design & Build delivers rear extensions across Elmbridge, East Molesey, Thames Ditton, Esher, Kingston, Surbiton and nearby Surrey towns. We coordinate design, planning route, structural openings, foundations, drainage, roof form, glazing, Building Regulations and finishing.
The best rear extensions balance internal space with garden depth, daylight, neighbour impact and the way the new area connects to the existing rooms.
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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Rear Extensions in Surrey & Elmbridge:
HWP Design & Build provides rear extension design and construction across Surrey, Elmbridge and nearby South West London. We assess garden depth, boundary position, neighbouring windows, drainage, foundations, structural openings, roof design, glazing, planning, Building Regulations and finish specification before preparing a fixed-price quotation.
What type of rear extension is right for your home?
Rear extensions can range from modest additions to full-width kitchen and family spaces. The right option depends on your plot, planning position and how you want to use the new room.
| Option | Best suited to | Typical benefit |
|---|---|---|
| Modest rear extension | Homes needing a practical increase in kitchen or living space. | Adds useful room while preserving garden depth. |
| Full-width rear extension | Homes where the back of the property can be opened up across a wider span. | Creates a larger kitchen, dining and family space. |
| Rear kitchen extension | Homes where the kitchen needs more space and a better garden connection. | Creates a brighter, more social heart of the home. |
| Rear extension with roof lantern | Layouts where daylight needs to reach the middle of the plan. | Improves brightness and makes the space feel more generous. |
| Rear extension with refurbishment | Homes where the existing ground floor also needs reworking. | Connects old and new rooms into a more coherent layout. |
Planning permission, permitted development and local design context
Some rear extensions can be possible under permitted development where limits and conditions are met, but planning permission may be required where depth, height, materials, previous extensions, conservation context or neighbour impact exceed those limits. Larger rear extensions can also involve prior approval or householder planning routes.
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 rear extension cost in Surrey?
Rear extension cost depends on depth, width, foundations, drainage, structural openings, roof form, glazing, kitchen or utility specification, heating, electrics and the level of internal refurbishment. 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 |
|---|---|
| Depth and width | Larger rear extensions increase foundations, structure, roofing, glazing and finishes. |
| Garden and access | Tight access, waste removal and protecting existing landscaping can affect site logistics. |
| Structural openings | Opening the rear wall requires steelwork, temporary support and careful sequencing. |
| Drainage and services | Manholes, rainwater, kitchen and utility drainage can affect the build route. |
| Roof design and glazing | Flat roofs, pitched roofs, lanterns, rooflights and doors change cost and comfort. |
| Internal refurbishment | Making the existing rooms work with the new space is often a key part of the budget. |
For broader budget planning, read our Surrey house extension cost guide or our Elmbridge house extension costs, planning and timeline guide.
Our rear 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 rear 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. |
Rear 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.
Rear Extension FAQs for Surrey & Elmbridge Homeowners
Some rear extensions can fall under permitted development, but it depends on depth, height, property type, materials, previous extensions and local restrictions. We check the route early.
We plan access, temporary protection, sequencing, kitchen downtime, service interruptions and communication before work starts.
Yes. Rooflights and lanterns can be excellent for bringing light into the extension and the original rooms behind it.
Not necessarily. We help you balance internal space and outdoor space so the extension feels proportionate to the property.
Yes. We coordinate Building Regulations details, inspections and completion documentation as part of the build process.
Yes. We can design materials, rooflines, brickwork, glazing and proportions to complement the existing home where that is the preferred approach.
Rear kitchen extensions, garden rooms and open-plan family spaces.
Ready to price your rear extension?
Whether you want to enlarge your kitchen, open up the rear wall, add roof glazing or create a better garden-facing family space, we can assess your property and provide fixed-price clarity before work begins.
Rear Extensions in Surrey & Elmbridge across East Molesey, Elmbridge, Surrey and nearby South West London.