Design and Build Company in Surrey & Elmbridge
- 30 years experience
- 10-year structural guarantee
- Fixed fee quotation
- 5% Scheduling discount
- 500+ Successful projects
A single accountable team to design, manage and build your home improvement from first idea to final handover.
Turnkey residential design and build for Surrey homes
A successful home improvement project needs more than a good drawing or a capable builder. It needs a clear brief, buildable design, realistic budgeting, planning awareness, structural coordination, compliant detailing, careful site management and a finish that works for daily life. HWP Design & Build brings those stages together through one coordinated design and build service for homeowners in Elmbridge, East Molesey, Esher, Thames Ditton, Kingston upon Thames, Surbiton and nearby Surrey and South West London locations.
Whether you are planning a house extension, loft conversion, renovation or refurbishment, basement fitout or full home reconfiguration, we help you understand the best route before work begins. The aim is simple: a better planned project, fewer handover gaps and clearer fixed-price quotation detail.
Design and build is especially valuable where layout, structure, approvals, budget and construction sequence need to be considered together. We coordinate design thinking, buildability, planning permission, Building Regulations, party wall support and project management as part of a practical, homeowner-focused service.
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 a local design and build approach focused on transparent scope, accountable delivery, insured workmanship and aftercare support.
Learn more about our design and build process, accreditations, insurance and guarantees, aftercare and customer reviews.
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Design and build in Surrey:
HWP Design & Build provides a complete residential design and build service across East Molesey, Elmbridge, Surrey and nearby South West London. We assess the property, brief, planning route, structure, Building Regulations, drainage, access, budget and finish specification before preparing a clear project scope and fixed-price quotation.
What is included in our design and build service?
The exact scope depends on your project, but the aim is to bring design, technical coordination and construction management into one joined-up route. This reduces the risk of drawings being attractive but difficult to build, or quotations being based on incomplete information.
| Stage | What we review | Why it matters |
|---|---|---|
| 1 Survey and feasibility | Existing layout, roof or extension potential, access, drainage, structure, boundaries and brief. | Establishes what is realistic before time and budget are committed. |
| 2 Concept and layout | Room flow, daylight, storage, kitchen or bathroom positions, garden connection and practical daily use. | Creates a home improvement that works as well as it looks. |
| 3 Planning route | Permitted development, lawful development certificates, planning applications and local constraints. | Reduces planning risk and avoids designing around assumptions. |
| 4 Technical coordination | Structure, Building Regulations, insulation, ventilation, drainage, heating, electrics and fire safety. | Turns the idea into a buildable, compliant project. |
| 5 Quotation and specification | Scope, finishes, allowances, exclusions, programme assumptions and build sequence. | Gives you a clearer basis for budgeting and decision-making. |
| 6 Managed build and handover | Site management, procurement, inspections, quality control, snagging and aftercare. | Protects quality and keeps responsibility clear through to completion. |
Design and build project types
Design and build is flexible enough to support a single major improvement or a wider home transformation. We help you choose the right route based on the property, planning position, budget, disruption level and long-term value.
| Project type | Best suited to | Typical design and build benefit |
|---|---|---|
| 1 House extensions | Homes needing more kitchen, dining, living, utility or bedroom space. | Coordinates layout, structure, foundations, drainage, glazing and finishes from the start. |
| 2 Loft conversions | Properties with roof space that can become a bedroom, office, ensuite or master suite. | Brings together structure, staircase position, insulation, fire safety and roof design. |
| 3 Renovations and refurbishments | Homes needing internal upgrades, layout changes, new finishes or whole-home improvement. | Aligns specification, trade sequencing, services and finish quality. |
| 4 Basement fitout and finishing | Homes with existing or planned lower-ground space needing a usable, comfortable finish. | Coordinates waterproofing context, ventilation, insulation, lighting, access and finishes. |
| 5 Kitchen extensions | Families wanting a larger kitchen, dining and everyday living space. | Plans structure, glazing, kitchen layout, services, storage and lighting as one scheme. |
| 6 Project management | Projects needing careful coordination of trades, inspections, decisions and programme. | Protects quality, communication, sequencing and accountability during delivery. |
How much does design and build cost in Surrey?
Design and build cost depends on the scale of work, how much design input is needed, whether planning is required, the level of structural work, the property condition and the finish specification. A straightforward internal refurbishment is very different from a full house extension, loft conversion or whole-home remodel with steelwork, drainage changes, kitchen installation and Building Regulations coordination.
Rather than publish a misleading headline price, we provide fixed-price clarity once the project scope, drawings, specification and site conditions are understood. This helps prevent one of the most common homeowner problems: comparing quotations that include different assumptions.
| Cost factor | Why it affects the quotation |
|---|---|
| Design complexity | Large openings, unusual layouts, premium finishes and complex room reconfiguration need more design and technical coordination. |
| Planning route | Permitted development checks, lawful development certificates, householder planning applications and conservation sensitivity can affect programme and documentation. |
| Structural work | Steelwork, load transfer, temporary works, foundations and roof alterations can materially change build scope. |
| Building Regulations | Insulation, ventilation, fire safety, electrics, drainage and structural compliance need to be properly designed and inspected. |
| Services and drainage | Kitchens, bathrooms, utility rooms, heating, electrics and drainage changes add coordination and trade requirements. |
| Finish specification | Flooring, glazing, joinery, kitchens, bathrooms, lighting, decorating and external finishes can significantly affect the final cost. |
Useful budget guides include our Surrey house extension cost guide, Elmbridge extension costs and timeline guide, Elmbridge loft conversion costs and planning guide and basement conversions in Surrey guide.
What happens after you request a design and build quotation?
We review your enquiry, discuss the property and your aims, then assess feasibility, permissions, structure, access, likely disruption and finish expectations before recommending a clear route forward.
Start your design and build enquiryLocal design and build considerations in Elmbridge and Surrey
Homes around East Molesey, Esher, Thames Ditton, Claygate, Surbiton, Kingston and Weybridge often combine strong property values with established housing stock, neighbouring boundaries, mature trees, conservation areas, drainage routes and access constraints. We review these local issues early so the design, quotation and programme reflect the real site.
| Area | Common design and build consideration | How we approach it |
|---|---|---|
| East Molesey / West Molesey | Family extensions, loft upgrades, shared boundaries, older layouts and Hampton Court area sensitivity. | Early review of access, drainage, party wall position, planning context and how the layout connects to the garden. |
| Esher / Claygate | Larger detached and semi-detached homes, specification-led projects and design quality expectations. | Detailed feasibility, finish specification, structural coordination and quotation clarity before build starts. |
| Thames Ditton / Long Ditton | Extensions, refurbishments and loft works where neighbouring properties, boundaries and access can be tight. | Careful planning around structure, deliveries, protection, drainage and neighbour impact. |
| Surbiton / Kingston upon Thames | Victorian, Edwardian and terrace-style homes with party wall, roof structure and internal layout constraints. | Practical design around staircase positions, structural openings, services, fire safety and build sequencing. |
| Weybridge / Walton-on-Thames / Cobham | Higher-specification refurbishments, extensions and whole-home improvements. | Clear brief development, specification-led pricing and careful management of quality expectations. |
How we deliver your design and build project
Our process is designed to move from early ideas to a buildable, costed and well-managed project. Each stage gives you more clarity before committing to the next step.
Design and build 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, Long Ditton, Esher, Claygate, Walton-on-Thames, Weybridge, Cobham, Kingston upon Thames, Surbiton, Teddington, Twickenham, Richmond, Wimbledon, Wandsworth, Putney, Raynes Park and Battersea.
Recent design and build projects
Explore examples of extension, loft conversion and refurbishment work to see how different property styles, planning constraints and layouts can be approached.
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Useful design and build guides
Related design and build services
Planning a residential design and build project? These related services help with layout, approvals, structure, project coordination and wider home improvement work.
Design and Build FAQs for Surrey & Elmbridge Homeowners
Design and build means one team coordinates the design, technical detailing, permissions, construction, finishing and handover. For homeowners, it reduces the gap between designer, builder and project manager, helping the project stay more practical, buildable and clearly costed from the start.
Yes. We provide design and build services across East Molesey, West Molesey, Elmbridge, Esher, Thames Ditton, Hampton Court, Kingston upon Thames, Surbiton, Walton-on-Thames, Weybridge, Cobham and nearby South West London. Our strongest local focus is within around 20 miles of East Molesey KT8.
Design and build is suitable for many residential projects, including house extensions, loft conversions, renovations and refurbishments, basement fitout and finishing, internal reconfiguration, re-roofing, kitchen extensions and whole-home improvement projects.
It depends on the project and how you want to manage responsibility. Design and build can be a good route if you want practical build input early, clearer coordination between drawings and construction, one accountable team and a quotation based on a defined scope. Some larger or highly bespoke projects may still involve separate specialist consultants, which we can coordinate where required.
Yes. If you already have architectural drawings, planning drawings or Building Regulations information, we can review them for buildability, specification gaps, likely cost drivers and construction sequencing before preparing a quotation.
Yes. We can assess whether permitted development may apply, whether a lawful development certificate is sensible, or whether a householder planning application is likely to be required. Where needed, we coordinate the planning route through our planning permission service.
Most structural, habitable or major home improvement projects require Building Regulations approval. This can include foundations, structure, insulation, ventilation, fire safety, drainage, electrics, heating and glazing. We coordinate this through our Building Regulations support.
You may need party wall notices if the project involves work on or near a shared boundary, structural work to a party wall, or excavation close to neighbouring foundations. This is common for side return extensions, rear extensions, loft conversions and basement-related works in tighter Surrey and South West London plots. We can support this through our party wall support service.
Yes. We aim to provide fixed-price clarity once the scope, drawings, specification, approvals route and site conditions are understood. This helps you compare what is actually included rather than relying on vague allowances or headline square-metre rates.
The design stage depends on the property, level of detail, planning route, structural input and how quickly key decisions are made. A straightforward internal improvement can move faster than a major extension, loft conversion or whole-home redesign that needs planning, structural design and Building Regulations coordination.
Yes. You will have a clear project lead for day-to-day communication, updates and coordination, so you are not left trying to manage designers, trades, suppliers and approvals separately.
It can reduce many common risks because buildability, sequencing, access, drainage, structure, specification and cost are reviewed together earlier. The aim is to prevent design decisions being made in isolation from practical construction and budget considerations.
Often yes, but it depends on the scale of work, access, dust control, services, kitchen disruption, temporary protection and whether major structural openings are being formed. We discuss likely disruption before work starts so you can plan realistically.
Yes. Our design and build route can include survey, feasibility, concept design, technical coordination, quotation, procurement, site management, inspections, finishing, snagging and aftercare.
A local team can bring practical knowledge of common property types, access constraints, neighbouring boundaries, drainage issues, conservation context and planning considerations across Elmbridge, Surrey and nearby South West London.
Design, approvals, construction and handover under one accountable route.
Ready to plan your design and build project?
Whether you are planning an extension, loft conversion, refurbishment, basement fitout or full home transformation, we can assess your property, explain the best route and provide fixed-price clarity before work begins.
Design and build services across East Molesey, Elmbridge, Surrey and nearby South West London.