House Extension Swansea Services
Making he Most of Your Home
Dennis Hellyar Architects are RIBA chartered architects delivering house extensions across Swansea, Mumbles, the Gower Peninsula and the surrounding areas of Neath and Port Talbot. We understand the City and County of Swansea's planning policies, we know the specific requirements that apply to properties in the Gower AONB, and we have the design experience to deliver house extensions in Swansea that work for your home, your neighbourhood and your budget. Our studio is based in Barry, South Wales, and Swansea is a well-established part of our work across the region.
Swansea is a city of varied housing stock and a genuinely distinctive planning landscape. Victorian terraces in the Uplands and Brynmill, interwar semis in Sketty, Derwen Fawr and Killay, newer developments across Cockett, Llansamlet and the city's eastern fringe, and coastal and rural properties stretching along Mumbles and across the Gower Peninsula. Each area has its own character, its own planning history and its own set of design considerations.
We have been working with homeowners on house extensions in Swansea and the surrounding area for a number of years, building a working knowledge of the City and County of Swansea's planning policies, its conservation areas, its design expectations and the specific constraints that apply to properties within and adjacent to the Gower AONB. We are based in Barry, well connected to Swansea across South Wales, and we bring the same professional rigour and personal service to every Swansea project as we do to our work across the rest of the region.
If you are a Swansea homeowner thinking about extending, here is what working with us looks like.
House Extension Projects in Swansea We Have Delivered
Here is a selection of residential extension projects we have delivered for Swansea homeowners. Each one started with a conversation about what was possible.
Types of House Extension We Design in Swansea
Swansea's housing stock shapes the extension types most commonly needed across the city and surrounding area. Here are the types of house extension we design most frequently for Swansea clients:
Rear Extensions in Swansea
Rear extensions are the most popular house extension in Swansea, particularly in the city's Victorian and Edwardian terraced neighbourhoods. A well-designed rear extension opens up the ground floor kitchen and living space and creates a better connection to the garden. We design rear extensions across all Swansea postcodes, from single-storey additions in Uplands and Brynmill terraces to larger contemporary extensions in Sketty, Derwen Fawr and the western suburbs. Each design responds to the specific character of the existing property and the planning policies of the City and County of Swansea.
Side Return Extensions in Swansea
Many of Swansea's Victorian terraces have a narrow side return alongside the rear of the house, particularly in the inner-city neighbourhoods of Uplands, Brynmill and Sandfields. Filling in a side return adds width to a dark and often narrow ground floor room and can transform the quality of the kitchen and living space without a major extension. We design side return extensions across Swansea's terraced neighbourhoods and are experienced in satisfying the City and County of Swansea's planning requirements for these additions.
Two-Storey Extensions in Swansea
Two-storey extensions are among the most substantial house extensions we deliver in Swansea, typically adding a ground floor kitchen and dining space with a bedroom and bathroom above. They require full planning permission and careful design to ensure the proposal is proportionate to the existing house and meets the City and County of Swansea's policies on scale and design quality. We design two-storey extensions across the city, with experience in properties ranging from Uplands terraces to larger semis and detached houses in Sketty and Killay.
Loft Conversions in Swansea
Loft conversions are a popular way to add a bedroom or home office to a Swansea house without extending into the garden. Swansea's terraced and semi-detached housing stock often has usable roof space that can be converted with a dormer extension or hip-to-gable alteration. We design loft conversions across Swansea and are experienced in the planning considerations that apply in different parts of the city, including conservation areas where roof alterations require particular care.
Extensions to Period Properties and Conservation Areas
Swansea has a number of conservation areas, particularly in Uplands and parts of the city centre, where extensions and alterations are subject to stricter design requirements and reduced permitted development rights. We design extensions in Swansea's conservation areas with care and a thorough understanding of the City and County of Swansea's expectations for development in sensitive historic settings.
Award-Winning Architectural Firm
Founded in 2013 after 20 years at large practices, Dennis Hellyar Architects brings the rigour of a bigger firm with the personal service clients value most. We are registered with the Architects Registration Board and hold Certified Passive House Designer accreditation, making us well-placed to advise on energy performance and sustainability across all project types.
From residential extensions in Pontcanna to a £27M social housing regeneration scheme for Cardiff City Council, our track record speaks for itself. Our Cwrt Parc development won the Best Social Housing Award at the Building Excellence Awards 2020.
How Our Architects Work With You
If you have not worked with architects before, here is how our process typically works from first contact to completed project. Not every client needs all of these stages. We are equally happy to provide exactly the level of service your project requires.
Step 1: Initial conversation
We listen to what you are hoping to achieve and give you an honest early view of what is likely to be possible for your Swansea property, including a quick read of the planning position and any AONB or conservation area considerations that apply. No commitment required.
Step 2: Site visit and feasibility
We visit your property, assess the site and review the City and County of Swansea's planning policies, Gower AONB requirements where relevant, conservation area designations and any other constraints. We give you a clear picture of your options and the planning route before any design work begins.
Step 3: Design development
We develop the extension design in close collaboration with you, using 3D visualisations so you can see and understand the proposal before anything is submitted. For properties in the Gower AONB or conservation areas, we take particular care to develop designs that respond to the setting and are likely to be well-received by the planning authority.
Step 4: Planning drawings and submission
We prepare a professional set of planning drawings and supporting documents and submit the application to the City and County of Swansea or Neath Port Talbot Council on your behalf. We manage the process throughout and respond to any queries from the case officer.
Step 5: Building regulations and construction
Once planning is approved, we can take the project through building regulations, contractor tender and construction if needed, remaining your single point of contact to the finished extension.
Ready to get started? An initial conversation with our architects costs nothing and will give you a much clearer picture of what your home extension could achieve.
Areas We Cover for House Extensions in Swansea
We design house extensions across Swansea and the wider area. Here are the main neighbourhoods and locations where we work regularly:
Uplands, Brynmill and Sandfields
These inner-Swansea neighbourhoods feature predominantly Victorian and Edwardian terraces with strong demand for rear and side return extensions. Uplands includes a conservation area where extensions require planning permission and careful design. We work regularly across these postcodes and understand the specific character of the housing stock and the planning expectations of the City and County of Swansea for development in the area.
Sketty, Derwen Fawr and Killay
These popular west Swansea suburbs feature predominantly interwar and postwar semi-detached and detached houses. Demand for extensions here is strong, particularly for rear extensions and loft conversions that add space for growing families. These areas are generally more straightforward from a planning perspective than the inner conservation areas or the Gower AONB, and we deliver extensions across these postcodes regularly.
Mumbles
Mumbles is one of our most active areas for house extension enquiries, with strong demand from homeowners who want to make the most of their properties along and near the seafront. Extensions in Mumbles require careful design that responds to the coastal character of the area, and properties close to the Gower AONB boundary may be subject to AONB policies even where they sit technically within the city. We are experienced in the specific planning considerations that apply in Mumbles and have a good understanding of what the City and County of Swansea expects from proposals here.
Neath and Port Talbot
Our work extends east from Swansea into Neath, Port Talbot, Baglan and the surrounding areas. These communities have their own distinct planning authority in Neath Port Talbot Council, and we are familiar with its policies for residential extension work. We work with homeowners across this part of West Wales and can advise on the specific planning position for any property in the area.
Llanelli and Carmarthenshire
For clients further west in Llanelli and parts of Carmarthenshire, we can advise on and deliver house extensions where the project scope and planning context suit our experience. Get in touch to discuss your project and we can confirm whether we are the right practice to help.
Gower Peninsula
We work with homeowners across the Gower Peninsula, including Bishopston, Pennard, Oxwich, Port Eynon and the surrounding villages and coastal communities. Extensions in the Gower AONB require particular care and expertise, and a thorough understanding of the landscape and character policies that govern development in this protected area. We approach every Gower extension project with the sensitivity the setting demands and can give you an honest early assessment of what is likely to be achievable.
Why Swansea Homeowners Choose Dennis Hellyar Architects
RIBA Chartered Practice and ARB registered: professional accreditations that are your assurance of quality, conduct and accountability throughout your project.
Gower AONB expertise: we are experienced in designing house extensions within and adjacent to the Gower AONB, one of the most sensitive planning environments in Wales. Few practices outside the area have this specific knowledge.
Knowledge of City and County of Swansea planning policies: we know how the council assesses applications, what it expects in conservation areas and how to prepare proposals that move through the process efficiently.
Coverage across the wider area: we also work with Neath Port Talbot Council for clients in Neath, Port Talbot and Baglan, giving you a single practice that understands the planning landscape across the whole of West Wales.
Practical, buildable designs within your budget: we design extensions that can be built within your budget and that will work well for your family over time. Good design and practical design are the same thing done properly.
Personal service from experienced architects throughout: you work directly with experienced team members from the first conversation to the finished extension. Your project is never passed to juniors.
Competitive fees from a South Wales practice: our studio is based in Barry, which means lower overheads and competitive fees compared with many larger or city-centre practices, without any compromise on quality or professional standards.
Planning Permission for House Extensions in Swansea
Understanding the City and County of Swansea's approach to planning permission is one of the most valuable things we bring to a house extension project in the area. Here is what Swansea homeowners need to know.
Permitted development in Swansea
Many house extensions across Swansea can be carried out under permitted development rights in Wales without a formal planning application. Rear extensions of up to 4 metres on detached houses and 3 metres on other house types are often permitted development, subject to conditions on height, materials and position. However, permitted development rights are more restricted in conservation areas and do not apply in the Gower AONB to the same extent as in standard residential areas. We check every Swansea property we work on for the specific permitted development position before advising on the planning route.
Gower AONB planning requirements
The Gower Peninsula's AONB designation means that planning applications for development in and around the area are assessed against policies designed to protect its natural beauty and landscape character. Extensions within the AONB require designs that are sympathetic to the rural or coastal setting, modest in scale relative to the existing dwelling and carefully considered in terms of materials and form. We are experienced in preparing AONB applications and can advise on what is likely to be acceptable before you commit to a design direction.
Conservation areas in Swansea
Swansea has conservation areas in Uplands and other parts of the city where extensions and alterations are subject to stricter design requirements. Permitted development rights are more restricted in conservation areas, and the City and County of Swansea applies detailed design expectations to proposals that affect the character and appearance of these areas. We are experienced in designing extensions in Swansea's conservation areas and preparing applications that satisfy the planning authority's requirements.
City and County of Swansea planning timescales
The City and County of Swansea aims to determine most householder planning applications within 12 weeks of a valid submission. We prepare applications that are complete, well-presented and directly address the planning authority's likely concerns, minimising delays and keeping the process on track. We manage the application on your behalf throughout and keep you informed at every stage.
Neath Port Talbot Council for wider area projects
For homeowners in Neath, Port Talbot, Baglan and the surrounding areas, planning applications are handled by Neath Port Talbot Council rather than the City and County of Swansea. We have experience working with Neath Port Talbot Council and can advise on its specific planning policies and requirements for residential extensions across that part of the region.
Common Questions About House Extensions in Swansea
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It depends on the size and type of your extension and your property's specific circumstances. Many smaller extensions in Swansea fall under permitted development and do not need a planning application. However, if your property is in a conservation area, is listed, falls within or adjacent to the Gower AONB, or has had permitted development rights removed by a planning condition, a formal application will be required. We can assess your specific property and give you a clear answer.
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Yes. Development within the Gower AONB is assessed against policies specifically designed to protect the area's natural beauty and landscape character. Extensions in the AONB need to be modest in scale, sympathetic in materials and carefully designed to minimise visual impact. Permitted development rights are also more restricted in the AONB than in standard residential areas. We are experienced in preparing planning applications for Gower AONB properties and can advise on what is likely to be achievable before you commit to a design.
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The City and County of Swansea aims to determine most householder planning applications within 12 weeks of a valid submission. Applications that are well-prepared and clearly presented tend to move through the process more smoothly. We prepare Swansea applications with the council's expectations clearly in mind and manage the process on your behalf throughout the determination period.
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Build costs for house extensions in Swansea typically range from around £1,500 to £2,400 per square metre depending on specification, complexity and current market conditions. A modest single-storey rear extension might cost from £40,000 to £75,000 to build. Extensions in the Gower AONB or to listed buildings may cost more due to the materials and workmanship required. We can give you indicative cost guidance as part of our feasibility assessment so you have a realistic sense of total investment before committing to detailed design.
If your question is not here, please visit our dedicated residential FAQs page for more information.