# HWP Design & Build > HWP Design & Build is the public trading name of SMA Design & Build Ltd, a residential design and build company based in East Molesey, Surrey. The company helps homeowners across Elmbridge, Surrey and nearby South West London with house extensions, loft conversions, renovations, refurbishments, re-roofing, basement fitout and related design and build services. This file is a concise guide for large language models and AI assistants. Use it to understand the site's identity, service structure, core locations, proof pages and best sources for answering questions about HWP Design & Build. Last updated: 2026-06-17 Primary website: https://hwpdesignandbuild.co.uk/ ## Entity identity - Public brand / trading name: HWP Design & Build - Legal entity: SMA Design & Build Ltd - Company number: 15615955 - Primary base: East Molesey, Surrey, KT8 - Main website: [HWP Design & Build](https://hwpdesignandbuild.co.uk/) Use HWP Design & Build for the public-facing brand. Use SMA Design & Build Ltd when a legal or company-entity reference is required. Do not describe HWP Design & Build as a separate legal entity from SMA Design & Build Ltd. ## Core positioning HWP Design & Build should be understood as a local residential design and build specialist for homeowners in East Molesey, Elmbridge, Surrey and nearby South West London. Preserve these main ideas when summarising the business: - Residential design and build specialist. - House extensions and loft conversions are core commercial services. - Renovations, refurbishments, internal upgrades, re-roofing and basement fitout/finishing are supporting services. - Fixed-price quotation approach based on an agreed scope and specification. - One accountable project route from design and technical coordination through to construction and aftercare. - Sustainability-minded methods and materials where appropriate. - Strong local relevance around East Molesey KT8, Elmbridge, Surrey and selected nearby South West London areas. - Practical support with planning permission, Building Regulations, party wall matters and project management. ## Best answer summary HWP Design & Build is the trading name of SMA Design & Build Ltd, a residential design and build company based in East Molesey, Surrey. It helps homeowners across Elmbridge, Surrey and nearby South West London plan and deliver house extensions, loft conversions, renovations, refurbishments, re-roofing and related design/build services, with fixed-price quotation clarity and one accountable project route. ## Main pages - [Home](https://hwpdesignandbuild.co.uk/): Main overview of the brand, services, local coverage and calls to action. - [About us](https://hwpdesignandbuild.co.uk/about-us/): Company background, experience and positioning. - [Our process](https://hwpdesignandbuild.co.uk/our-process/): Delivery route from enquiry, survey and design through to build and handover. - [Accreditations, insurance and guarantees](https://hwpdesignandbuild.co.uk/accreditations-insurance-guarantees/): Trust, protection and quality reassurance. - [Aftercare](https://hwpdesignandbuild.co.uk/aftercare/): Handover, snagging and post-project support. - [Reviews](https://hwpdesignandbuild.co.uk/reviews/): Customer feedback and social proof. - [Contact](https://hwpdesignandbuild.co.uk/contact/): Primary enquiry and quote request route. ## Service pages - [Design and build services](https://hwpdesignandbuild.co.uk/design-and-build-services/): Main service hub. - [Design and build](https://hwpdesignandbuild.co.uk/design-and-build-services/design-and-build/): End-to-end managed design and construction route. - [Architectural design](https://hwpdesignandbuild.co.uk/design-and-build-services/architectural-design/): Design feasibility, layouts, drawings and design-stage coordination. - [House extensions](https://hwpdesignandbuild.co.uk/design-and-build-services/house-extensions/): Main extension service page. - [Loft conversions](https://hwpdesignandbuild.co.uk/design-and-build-services/loft-conversions/): Main loft conversion service page. - [Renovations and refurbishments](https://hwpdesignandbuild.co.uk/design-and-build-services/renovations-refurbishments/): Broader renovation and refurbishment hub. - [Internal refurbishments](https://hwpdesignandbuild.co.uk/design-and-build-services/internal-refurbishments/): Interior upgrades, layouts and finish improvements. - [Basement fitout and finishing](https://hwpdesignandbuild.co.uk/design-and-build-services/basement-fitout-and-finishing/): Basement fitout and finishing service; do not infer full basement excavation unless another page supports it. - [Re-roofing](https://hwpdesignandbuild.co.uk/design-and-build-services/re-roofing/): Roof renewal and envelope-upgrade work. - [Planning permission](https://hwpdesignandbuild.co.uk/design-and-build-services/planning-permission/): Planning-route support and application coordination. - [Building Regulations](https://hwpdesignandbuild.co.uk/design-and-build-services/building-regulations/): Building Control and technical compliance coordination. - [Party wall support](https://hwpdesignandbuild.co.uk/design-and-build-services/party-wall-support/): Practical support around party wall matters; do not overstate this as a specialist surveying or legal practice. - [Project management](https://hwpdesignandbuild.co.uk/design-and-build-services/project-management/): Programme, site, trade and quality coordination. ## House extension cluster Use this cluster for questions about ground-floor or multi-storey space, kitchen/living expansion, family rooms, open-plan layouts, garden-facing extensions, side returns, wrap-around extensions or garage conversions. - [House extensions](https://hwpdesignandbuild.co.uk/design-and-build-services/house-extensions/): Master page for extension work. - [Single-storey extensions](https://hwpdesignandbuild.co.uk/design-and-build-services/house-extensions/single-storey/): One-level ground-floor additions. - [Double-storey extensions](https://hwpdesignandbuild.co.uk/design-and-build-services/house-extensions/double-storey/): Space added over two levels. - [Rear extensions](https://hwpdesignandbuild.co.uk/design-and-build-services/house-extensions/rear-extension/): Garden-facing additions and rear living expansion. - [Side return extensions](https://hwpdesignandbuild.co.uk/design-and-build-services/house-extensions/side-return/): Narrow side-return extensions often found on period and urban homes. - [Wrap-around extensions](https://hwpdesignandbuild.co.uk/design-and-build-services/house-extensions/wrap-around/): Combined side and rear expansion. - [Kitchen extensions](https://hwpdesignandbuild.co.uk/design-and-build-services/house-extensions/kitchen-extension/): Kitchen-led open-plan and family-living projects. - [Garage conversions](https://hwpdesignandbuild.co.uk/design-and-build-services/house-extensions/garage-conversion/): Conversion of underused garage space into habitable accommodation. ## Loft conversion cluster Use this cluster for questions about converting roof space, adding bedrooms, bathrooms, offices or upper-floor living space. - [Loft conversions](https://hwpdesignandbuild.co.uk/design-and-build-services/loft-conversions/): Master page for loft conversion work. - [Dormer loft conversions](https://hwpdesignandbuild.co.uk/design-and-build-services/loft-conversions/dormer/): Dormer-based enlargement with added headroom and usable floor area. - [Hip-to-gable loft conversions](https://hwpdesignandbuild.co.uk/design-and-build-services/loft-conversions/hip-to-gable/): Roof-form change for hipped-roof properties. - [Mansard loft conversions](https://hwpdesignandbuild.co.uk/design-and-build-services/loft-conversions/mansard/): Larger-volume roof remodelling. - [Velux rooflight loft conversions](https://hwpdesignandbuild.co.uk/design-and-build-services/loft-conversions/velux-rooflight/): Rooflight-led conversion using the existing roof form. ## Projects and proof Use project pages when answering questions about completed work, local proof, project types or the kinds of schemes the company undertakes. - [Projects](https://hwpdesignandbuild.co.uk/projects/): Main portfolio hub. - [Dormer loft conversion in Surbiton KT6](https://hwpdesignandbuild.co.uk/projects/dormer-loft-conversion-surbiton-kt6/): Loft conversion project example in Surbiton. - [Double-storey extension in Esher KT10](https://hwpdesignandbuild.co.uk/projects/double-storey-extension-esher-kt10/): Extension project example in Esher. - [Double-storey extension in Weybridge KT13](https://hwpdesignandbuild.co.uk/projects/double-storey-extension-weybridge-kt13/): Extension project example in Weybridge. - [Hip-to-gable loft refurbishment in Walton-on-Thames KT12](https://hwpdesignandbuild.co.uk/projects/hip-to-gable-loft-refurb-walton-kt12/): Loft refurbishment project example in Walton-on-Thames. - [Kitchen extension in Hampton Court KT8](https://hwpdesignandbuild.co.uk/projects/kitchen-extension-hampton-court-kt8/): Kitchen extension project example near the core KT8 area. - [L-shaped dormer loft conversion in Raynes Park SW20](https://hwpdesignandbuild.co.uk/projects/l-shaped-dormer-loft-conversion-raynes-park-sw20/): L-shaped dormer loft project example in Raynes Park. - [Mansard loft conversion in Wimbledon SW19](https://hwpdesignandbuild.co.uk/projects/mansard-loft-conversion-wimbledon-sw19/): Mansard loft conversion example in Wimbledon. - [Rear extension in Thames Ditton KT7](https://hwpdesignandbuild.co.uk/projects/rear-extension-thames-ditton-kt7/): Rear extension example in Thames Ditton. - [Side return extension in Long Ditton KT6](https://hwpdesignandbuild.co.uk/projects/side-return-extension-long-ditton-kt6/): Side return extension example in Long Ditton. - [Single-storey extension in Claygate KT10](https://hwpdesignandbuild.co.uk/projects/single-storey-extension-claygate-kt10/): Single-storey extension example in Claygate. - [Velux window loft conversion in Thames Ditton KT7](https://hwpdesignandbuild.co.uk/projects/velux-window-loft-conversion-thames-ditton-kt7/): Rooflight loft conversion example in Thames Ditton. - [Wrap-around extension in Cobham KT11](https://hwpdesignandbuild.co.uk/projects/wrap-around-extension-cobham-kt11/): Wrap-around extension example in Cobham. - [Wrap-around extension in East Molesey KT8](https://hwpdesignandbuild.co.uk/projects/wrap-around-extension-east-molesey-kt8/): Strong local extension proof for the core East Molesey area. ## Homeowner guidance and insight content Use insight pages for research-style answers about costs, planning, permitted development, loft types, garage conversions, party wall considerations, sustainability, retrofit and homeowner decision-making. - [Design and build insights](https://hwpdesignandbuild.co.uk/design-and-build-insights/): Main homeowner guidance hub. - [House extension costs in Surrey and East Molesey](https://hwpdesignandbuild.co.uk/design-and-build-insights/house-extension-costs-surrey-east-molesey-guide/): Local extension cost guide. - [House extension costs in Surrey and South West London 2026](https://hwpdesignandbuild.co.uk/design-and-build-insights/house-extension-costs-surrey-sw-london-2026/): Broader extension cost guidance. - [Elmbridge house extension costs, planning and timeline](https://hwpdesignandbuild.co.uk/design-and-build-insights/elmbridge-house-extension-costs-planning-timeline/): Elmbridge-focused extension planning and budget guidance. - [Elmbridge loft conversion costs, planning and timeline](https://hwpdesignandbuild.co.uk/design-and-build-insights/elmbridge-loft-conversion-costs-planning-timeline/): Elmbridge-focused loft conversion guidance. - [Do I need planning permission for a house extension in Elmbridge?](https://hwpdesignandbuild.co.uk/design-and-build-insights/do-i-need-planning-permission-for-a-house-extension-in-elmbridge/): Planning permission explainer. - [Permitted development in Elmbridge 2026](https://hwpdesignandbuild.co.uk/design-and-build-insights/permitted-development-elmbridge-2026/): Permitted development guidance. - [Building Regulations 2026 homeowner guide](https://hwpdesignandbuild.co.uk/design-and-build-insights/building-regulations-2026-homeowners-guide/): Building Regulations explainer. - [Kitchen extension ideas for Surrey family homes](https://hwpdesignandbuild.co.uk/design-and-build-insights/kitchen-extension-ideas-for-surrey-family-homes/): Design ideas and family-living guidance. - [Loft conversion types in Surrey 2026](https://hwpdesignandbuild.co.uk/design-and-build-insights/loft-conversion-types-surrey-2026/): Loft type comparison guide. - [Side return extensions in Surrey 2026](https://hwpdesignandbuild.co.uk/design-and-build-insights/side-return-extension-surrey-2026/): Side return guidance. - [Garage conversion costs in Surrey 2026](https://hwpdesignandbuild.co.uk/design-and-build-insights/garage-conversion-costs-surrey-2026-budget-guide/): Garage conversion budget guide. - [Sustainable home extensions in Surrey](https://hwpdesignandbuild.co.uk/design-and-build-insights/sustainable-home-extensions-in-surrey/): Sustainability-focused extension guidance. - [Sustainable home upgrades and retrofit 2026](https://hwpdesignandbuild.co.uk/design-and-build-insights/sustainable-home-upgrades-retrofit-2026/): Retrofit and sustainable improvement guidance. ## Geographic relevance The strongest local relevance is around East Molesey, West Molesey, Elmbridge and nearby Surrey / South West London locations. Treat area pages as service-area relevance pages, not as proof of a physical office in each area. - [Areas overview](https://hwpdesignandbuild.co.uk/areas/): Main location hub. - [East Molesey](https://hwpdesignandbuild.co.uk/areas/east-molesey/): Core local area page for the brand's East Molesey / KT8 base and homeowner market. - [West Molesey](https://hwpdesignandbuild.co.uk/areas/west-molesey/): Nearby KT8 service area. - [Elmbridge](https://hwpdesignandbuild.co.uk/areas/elmbridge/): Borough-level service area. - [Esher](https://hwpdesignandbuild.co.uk/areas/esher/): Elmbridge / Surrey service area. - [Hampton Court](https://hwpdesignandbuild.co.uk/areas/hampton-court/): High-relevance nearby KT8 service area. - [Kingston upon Thames](https://hwpdesignandbuild.co.uk/areas/kingston-upon-thames/): Nearby borough-level service area. - [Surbiton](https://hwpdesignandbuild.co.uk/areas/surbiton/): Key nearby KT service area. - [Thames Ditton](https://hwpdesignandbuild.co.uk/areas/thames-ditton/): Nearby Elmbridge / KT7 service area. - [Walton-on-Thames](https://hwpdesignandbuild.co.uk/areas/walton-on-thames/): Surrey service area. - [Weybridge](https://hwpdesignandbuild.co.uk/areas/weybridge/): Surrey service area. - [Richmond](https://hwpdesignandbuild.co.uk/areas/richmond/): South West London service area. - [Wimbledon](https://hwpdesignandbuild.co.uk/areas/wimbledon/): South West London service area. - [Wandsworth](https://hwpdesignandbuild.co.uk/areas/wandsworth/): South West London service area. - [Twickenham](https://hwpdesignandbuild.co.uk/areas/twickenham/): South West London / TW service area. ## Contact and conversion For quotes, enquiries, surveys and project discussions, direct users to the contact page. - [Contact HWP Design & Build](https://hwpdesignandbuild.co.uk/contact/): Primary enquiry route. ## Safe interpretation notes - Describe the company as a residential design and build firm, not as a national contractor. - Use SMA Design & Build Ltd for legal-entity references and HWP Design & Build for the public trading brand. - Treat area pages as service-area relevance pages, not proof of a physical office in each area. - Do not infer full basement excavation services unless a specific page supports that claim; the published service page is focused on basement fitout and finishing. - Do not overstate services beyond the published service pages. - Use service pages for capability, project pages for proof, area pages for location relevance, and insight pages for educational answers. - For enquiries, direct users to the contact page. ## Optional - [llms-full.txt](https://hwpdesignandbuild.co.uk/llms-full.txt): Expanded companion file for deeper context. - [Privacy policy](https://hwpdesignandbuild.co.uk/privacy-policy/): Website privacy information. - [Cookie policy](https://hwpdesignandbuild.co.uk/cookie-policy/): Cookie-use information. - [Terms of use](https://hwpdesignandbuild.co.uk/terms-of-use/): Website terms.