House Extension Vale of Glamorgan Services from Local Architects
Making the Most of Your Home
Dennis Hellyar Architects are RIBA chartered architects based in Barry, Vale of Glamorgan, delivering house extensions across the Vale and the surrounding area. We are not an outside practice covering the Vale from a distance. We are local, we know Vale of Glamorgan Council's planning policies in detail, and we have an award-winning track record of delivering well-designed extensions and residential projects across the area. From a rear extension in Penarth to a period property renovation in Cowbridge, house extensions in the Vale of Glamorgan are where we do our best work.
The Vale of Glamorgan is one of the most varied areas in South Wales for residential architecture. Victorian and Edwardian terraces in Penarth, interwar and postwar housing across Barry's residential neighbourhoods, Georgian market town properties in Cowbridge, stone cottages and farmhouses throughout the rural Vale, and coastal homes overlooking the Bristol Channel from Llantwit Major to Ogmore-by-Sea. Every property type brings its own design opportunities and its own planning considerations.
Our studio has been based in Barry since Dennis founded the practice in 2013. Over a decade of working across the Vale means we know the area in a way that no practice working from Cardiff or further afield can match. We know Vale of Glamorgan Council's planning officers, its design policies, its conservation areas and its Heritage Coast requirements. That local knowledge is not just a marketing claim. It translates directly into better-prepared planning applications and better outcomes for our clients.
If you are a Vale of Glamorgan homeowner thinking about a house extension, you are talking to the right people.
House Extension Projects in the Vale of Glamorgan We Have Delivered
Here is a selection of residential extension projects we have delivered for Vale of Glamorgan homeowners. Each one started with a conversation about what was possible.
Types of House Extension We Design in the Vale of Glamorgan
The range of property types across the Vale means we design a wide variety of extension types for our clients. Here are the most common:
Rear Extensions in the Vale of Glamorgan
Rear extensions are the most common house extension we deliver across the Vale. Whether it is a single-storey kitchen extension to a Barry terrace, a contemporary glazed addition to a Penarth Edwardian villa, or a more substantial rear extension to a Cowbridge townhouse, we design rear extensions that respond to the character of the existing property and satisfy Vale of Glamorgan Council's planning requirements. We have completed rear extensions across every part of the Vale and know the specific considerations that apply in each area.
Side Return and Wrap-Around Extensions
Many of the Vale's Victorian and Edwardian terraces, particularly in Penarth and parts of Barry, have a side return alongside the rear of the house that can be incorporated into an extension. Filling in a side return, or combining it with a rear extension in a wrap-around design, is one of the most effective ways to transform the ground floor of a terrace. We design side return and wrap-around extensions across the Vale and are experienced in satisfying Vale of Glamorgan Council's requirements for these types of addition.
Two-Storey Extensions in the Vale of Glamorgan
Two-storey extensions are a popular way to maximise space across both floors of a Vale of Glamorgan property. They typically require full planning permission and careful design to ensure they are proportionate to the existing house and meet Vale of Glamorgan Council's policies on scale and design quality. We design two-storey extensions across the Vale, with experience in properties ranging from suburban semis in Dinas Powys to larger detached houses in the rural Vale.
Loft Conversions in the Vale of Glamorgan
Loft conversions are a cost-effective way to add a bedroom, home office or bathroom to a Vale of Glamorgan house without extending outward. We design loft conversions across the Vale, including dormer extensions and hip-to-gable conversions for both terraced and semi-detached properties. In the Vale's conservation areas, roof alterations require planning permission and sensitive design, and we are experienced in preparing applications that satisfy Vale of Glamorgan Council's requirements in these locations.
Extensions to Period Properties and Listed Buildings
The Vale of Glamorgan has a rich stock of historic properties, from listed farmhouses in the rural Vale to Georgian townhouses in Cowbridge and Victorian seaside villas in Penarth. Extending a listed building or a property in a conservation area requires specialist knowledge of Vale of Glamorgan Council's heritage policies and, for listed buildings, a listed building consent application alongside any planning permission. We have significant experience with historic property extensions across the Vale and approach each one with the care and sensitivity it demands.
Coastal and Rural Extensions in the Vale
Some of the most interesting extension projects we deliver in the Vale are on coastal and rural sites, where the planning context is shaped by the Heritage Coast designation, AONB policies or rural location constraints. Extensions on the Heritage Coast, in the rural Vale villages or on agricultural properties require careful design and a good understanding of the policies Vale of Glamorgan Council applies in these sensitive locations. As local architects with over a decade of Vale experience, we are well-placed to advise on what is achievable in these 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 possible for your Vale of Glamorgan property, including any planning considerations we can identify from the outset. Being local means we can often give useful early guidance very quickly.
Step 2: Site visit and feasibility
We visit your property, assess the site and review Vale of Glamorgan Council's planning policies, any conservation area designations, Heritage Coast constraints, listed building status or other specific factors that apply. 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 models and visualisations so you can see and understand the proposal. For extensions in the Vale's conservation areas, historic towns or on the Heritage Coast, we take particular care to develop designs that respond to the local setting.
Step 4: Planning drawings and submission
We prepare a professional set of planning drawings and supporting documents and submit the application to Vale of Glamorgan Council on your behalf. Our familiarity with the council's planning team and policies means applications are prepared to a standard that gives your project the best possible start.
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 throughout.
Being based in Barry means we are easy to reach throughout the process, easy to meet in person for site visits and design reviews, and closely connected to the local contractors and consultants who can help bring your project to life.
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 Bristol
We deliver house extensions across the entire Vale of Glamorgan council area. Here are the main towns and areas where we work most regularly:
Barry
Barry is where our studio is based and where we have the deepest local knowledge. We work across all of Barry's residential neighbourhoods, from the Victorian terraces of Barry town to the interwar and postwar housing of Cadoxton and Holton Road. We have completed numerous residential extension and renovation projects across Barry and know the area's planning context in exceptional detail. Barry homeowners benefit from particularly accessible, responsive service given our studio location.
Penarth
Penarth is one of our busiest areas for house extension work and one of the Vale's most architecturally distinctive towns. The town's Victorian and Edwardian seafront terraces and villas offer excellent scope for rear and side return extensions, but several areas of Penarth sit within conservation areas where Vale of Glamorgan Council applies detailed design guidance. We work extensively in Penarth and have a strong track record of securing planning approval for extensions in the town's historic streets.
Cowbridge
Cowbridge is the Vale's principal market town and has a high proportion of listed buildings and a conservation area covering much of the town centre. Extensions in Cowbridge require particular care and experience, both in the design itself and in how applications are presented to Vale of Glamorgan Council's heritage and planning officers. We work regularly in Cowbridge and the surrounding villages and are well-versed in what the council expects from proposals in this sensitive historic town.
Llantwit Major and the Heritage Coast
Llantwit Major is a popular location for house extension projects, with a mix of older and newer properties in and around the town. The Heritage Coast designation affects planning applications for properties in and around the coastal strip, and we are experienced in designing extensions that respond to the Heritage Coast context and satisfy Vale of Glamorgan Council's policies. We also work with homeowners in St Athan, Ogmore-by-Sea and the other coastal communities along this stretch of the Vale.
Dinas Powys, Sully and the Eastern Vale
Dinas Powys, Sully, Wenvoe and the eastern Vale communities are popular family areas within easy reach of Cardiff. Demand for house 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 Vale's conservation towns and coastal areas, and we deliver extensions across the eastern Vale postcodes regularly.
Rural Vale Villages
We work with homeowners in the Vale's rural villages, including Llancarfan, St Hilary, Wick, Llanblethian, St Nicholas and the many other settlements scattered across the Vale's countryside. Rural extensions require careful consideration of the policies Vale of Glamorgan Council applies to development in the open countryside, and we are experienced in developing proposals that are sympathetic to their rural setting and achievable within the planning framework.
Why Vale of Glamorgan Homeowners Choose Dennis Hellyar Architects
Based in Barry: genuinely local, not covering the Vale from a distance: our studio has been in Barry since 2013. We are embedded in the Vale in a way that no Cardiff or Bristol-based practice can replicate.
Award-winning: Best Social Housing Award, Building Excellence Awards 2020, Vale of Glamorgan Council: recognition from the local authority itself that reflects the standard of design and delivery we bring to every project in the Vale.
RIBA Chartered Practice and ARB registered: professional accreditations that are your assurance of quality and accountability.
Unmatched knowledge of Vale of Glamorgan Council planning policies: we know the planning officers, the policies and the design expectations that apply across the Vale, including conservation areas, the Heritage Coast and listed buildings.
Experience with every Vale property type: from Victorian Penarth terraces to rural Cowbridge farmhouses to coastal Heritage Coast properties, we have designed extensions across the full range of Vale property types and planning contexts.
Practical, buildable designs within your budget: we design extensions that can be built within your budget and that will work well for your family for years to come.
Personal, accessible service throughout: you work directly with experienced architects from the first conversation to the finished extension. Being local means we are easy to reach and quick to respond.
Planning Permission for House Extensions in the Vale of Glamorgan
Vale of Glamorgan Council is the local planning authority for the entire Vale, and understanding how it approaches planning applications is one of the most valuable things we bring to a house extension project in the area. Here is what Vale homeowners need to know.
Permitted development in the Vale of Glamorgan
Many house extensions across the Vale can be carried out under permitted development rights without a formal planning application. In Wales, 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 the Heritage Coast designation affects what is acceptable along the coastline. We assess every Vale property we work on and confirm the planning position before advising on the best route forward.
Conservation areas in the Vale of Glamorgan
The Vale has a significant number of conservation areas, including parts of Penarth town centre, Cowbridge, Llantwit Major and several of the Vale's historic villages. Extensions in conservation areas require planning permission for works that would be permitted development elsewhere, and Vale of Glamorgan Council applies detailed design guidance to proposals in these areas. We are experienced in all of the Vale's conservation areas and know what the council expects from extension designs in each one.
The Heritage Coast
The Vale of Glamorgan Heritage Coast stretches along the Bristol Channel coastline between Aberthaw and Ogmore-by-Sea. Development within and adjacent to the Heritage Coast is assessed against policies designed to protect the landscape and natural character of the area. For homeowners with coastal properties in Llantwit Major, St Donats, Ogmore-by-Sea and the surrounding area, this means planning applications require careful preparation and a design that responds sensitively to the coastal setting. We have experience with Heritage Coast applications and can advise on what is likely to be achievable.
Listed buildings in the Vale
The Vale of Glamorgan has a high density of listed buildings relative to its size, including farmhouses, cottages, former agricultural buildings and historic townhouses. Any works to a listed building, internally or externally, require listed building consent in addition to any planning permission. We prepare listed building consent applications and work with Vale of Glamorgan Council's heritage officers to develop proposals that are likely to be approved.
Vale of Glamorgan Council planning timescales
Vale of Glamorgan Council aims to determine most householder planning applications within 12 weeks of a valid submission. As a locally based practice with a longstanding working familiarity with the council's planning team, we know how to prepare applications that are well-received and move through the process efficiently. We keep you informed at every stage and manage any queries from the case officer on your behalf.
Common Questions About House Extensions in the Vale of Glamorgan
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It depends on the size and type of your extension and the specific circumstances of your property. Many extensions in the Vale fall under permitted development rights and do not require a planning application. However, properties in conservation areas, listed buildings, on the Heritage Coast or with planning conditions that remove permitted development rights will require a formal application regardless of size. We can assess your Vale of Glamorgan property quickly and give you a clear answer.
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Vale of Glamorgan Council aims to determine most householder planning applications within 12 weeks of a valid submission. As a locally based practice with a long working familiarity with the council, we prepare applications that are complete and well-presented from the outset, minimising delays. We manage the process throughout the determination period and keep you informed at every stage.
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Build costs for house extensions in the Vale of Glamorgan typically range from around £1,500 to £2,500 per square metre depending on specification, complexity and current market conditions. A modest single-storey rear extension might cost from £40,000 to £80,000 to build. Extensions to listed buildings or properties in sensitive planning contexts may cost more. We can give you indicative cost guidance as part of our feasibility assessment so you have a realistic sense of the total investment before committing to detailed design work.
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Yes, and this is one of our strongest areas of expertise. We work regularly in Penarth, Cowbridge, Llantwit Major and the Vale's rural conservation areas. We know what Vale of Glamorgan Council expects from extension designs in each of these locations and have a strong track record of securing planning approval for extensions in sensitive historic settings.
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Yes. Extensions on and near the Heritage Coast require careful consideration of Vale of Glamorgan Council's Heritage Coast policies, which are designed to protect the natural and landscape character of the coastline. We are experienced in working within these constraints and can advise on what is likely to be achievable before you commit to a design direction.
If your question is not here, please visit our dedicated residential FAQs page for more information.