South Wales Architects
specialising in house extensions and planning drawings
Based in Barry, we help homeowners across Cardiff and South Wales design, plan and secure approval for extensions - with a clear, straightforward process from start to finish.
Reimagining Home
If you’re planning a house extension, the first step is getting the right drawings and advice in place.
At Dennis Hellyar Architects, we are a Barry-based architectural practice working with homeowners across Cardiff, the Vale of Glamorgan and South Wales. We specialise in designing house extensions and preparing planning drawings that give your project the best chance of approval.
Whether you’re exploring ideas or ready to submit a planning application, we guide you through the process from initial design through to planning and beyond.
Residential & Commercial
Residential Architecture
We work closely with homeowners to design extensions, renovations and new homes that improve how you live, while adding long-term value to your property.
Commercial Architecture
Alongside residential work, we also deliver commercial projects for private clients, organisations and community sectors across South Wales and the South West.
Sustainability
We believe good design should also be responsible.
Our work incorporates sustainable design principles where appropriate, helping to improve energy performance, reduce environmental impact and create comfortable, efficient spaces.
Services
House Extension Design
We design high-quality home extensions tailored to your property, budget and lifestyle - from single-storey extensions to larger, more complex transformations.
Planning Drawings & Applications
We prepare and submit planning drawings for house extensions across Cardiff and South Wales, ensuring your proposal is clear, compliant and professionally presented.
Feasibility & Early Advice
Not sure what’s possible? We assess your property and provide clear, practical guidance on what you can realistically achieve before you commit.
Full Architectural Services
For clients looking for a complete service, we can take your project through technical design, Building Regulations and construction stages.
Process
How we help you get your extension approved
Initial consultation
Measured survey & design options
Planning drawings prepared
Submission & support through planning
Technical design & construction support (if required)
Location
Although based in Barry, we regularly work with homeowners across:
South Wales and the South West
This local experience gives us a strong understanding of planning requirements across different authorities.
Why choose us
Choosing the right architect isn’t just about design - it’s about making the process simple and getting results.
Experienced in residential extensions across Cardiff and South Wales
Clear, straightforward advice without unnecessary jargon
Strong understanding of local planning policies and constraints
Focused on practical, buildable design solutions
Friendly, collaborative approach from start to finish
FAQ
Do I need an architect for a house extension?
While not always required, working with an architect ensures your extension is well-designed, compliant and more likely to gain planning approval.
Do I need planning permission for an extension?
Some extensions fall under permitted development, but many require planning approval. We can advise based on your property and location.
How much do extension drawings cost?
Costs vary depending on the size and complexity of your project. We provide clear, upfront guidance following an initial consultation.
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