Dennis Hellyar Architects

02/10/2026

Sustainable house design in Swansea combining recycled materials, solar PV, air source heating and high-performance contemporary residential architecture

04/06/2026

We had a knock-out 5⭐️ review from our Clients at 3 Cold Knap Way, Barry, yesterday:

'We’ve had a brilliant experience working with Dennis and the team at Dennis Hellyar Architects. The visuals they created were incredibly impressive and really brought our ideas to life. Dennis has been supportive, approachable and generous with his advice throughout the process, and it’s clear he genuinely cares about achieving the best outcome for his clients.

A special mention as well to Jesus and Callum — both were fantastic to deal with, professional, friendly and clearly very talented. Their input made the whole experience even smoother.

We’re very grateful for all the work so far and would happily recommend the whole team to anyone looking for a reliable, creative and client‑focused architectural practice.' 😍

27/05/2026

We just received a 5⭐️ Review on Google:

We are delighted to be able to leave a 5 star review with regard to the design work Dennis Hellyar and his team recently completed for us. Dennis with his knowledge and expertise was able to creatively provide us with a variety of options to re-configure and maximise space within our planned extension. We could never have imagined the possibilities without his input. In particular he listened intently and was sensitive to our preliminary and emerging ideas. His advice was clear and always with our interests in mind.
We thoroughly recommend him without reservation.

Alan and Jane Salisbury

27/05/2026

★★★★★ · Architect

27/05/2026

Best Architect Cardiff For Modern Sustainable Home Design Solutions Tailored To Your Budget And Vision

Searching for the best architect Cardiff homeowners trust for stylish, sustainable and budget-friendly design? Dennis Hellyar Architects provides architectural services Barry, Cardiff and South Wales clients rely on for house extensions, planning applications Cardiff support, refurbishments and modern residential architecture.

From homes near Romilly Park and Whitmore Bay to projects around Cardiff University and Barry Waterfront Retail Park, our experienced team delivers tailored solutions with strong local planning knowledge, quality professionalism and clear communication throughout every stage of work.

As a RIBA Chartered Practice with ARB registered architect expertise, we create sustainable architecture and modern house design architect Cardiff solutions that add value to your property while matching your vision and price expectations.

Need a trusted residential architect Cardiff or planning consultant Cardiff homeowners recommend? Speak with our responsive team today and start designing your future with confidence.

Business Hours:
Monday-Friday 9am-7pm
Saturday 9am-1pm
Sunday Closed

Visit Our Website: https://www.dennishellyar-architects.com/

Visit Us On Google Maps: https://maps.app.goo.gl/5dxbC7i2HfrvHxGq9

Explore More About Us: https://www.google.com/search?kgmid=/g/12lld3gmx

5.0 ⭐ · Architect in Barry, Wales

27/05/2026

Affordable Architect Cardiff Extension Packages

Planning a home renovation or need more space? Dennis Hellyar Architects offers affordable architect Cardiff extension packages tailored to homeowners across Barry, Cardiff and South Wales. From homes near Romilly Park, The Knap Lake and Gardens and Whitmore Bay to properties close to Cardiff University and Victoria Park, we deliver trusted architectural services designed around your budget and vision.

Whether you need a house extension architect Cardiff, architect for small house extension Cardiff, refurbishment plans or support with planning applications Cardiff, our experienced team provides senior-level guidance, strong local planning knowledge and clear communication throughout every stage of work.

As a RIBA Chartered Practice with ARB registered architect expertise and Certified Passive House Designer credentials, we create sustainable architecture and modern building design solutions that add value to your property with reasonable pricing and trusted professionalism.

Need a residential architect Cardiff for your extension or renovation project? Contact us today and start planning smarter with expert support tailored to your home.

Business Hours:
Monday-Friday 9am-7pm
Saturday 9am-1pm
Sunday Closed

Visit Our Website: https://www.dennishellyar-architects.com/

Visit Us On Google Maps: https://maps.app.goo.gl/5dxbC7i2HfrvHxGq9

Explore More About Us: https://www.google.com/search?kgmid=/g/12lld3gmx

5.0 ⭐ · Architect in Barry, Wales

12/05/2026

Really pleased with this 5⭐️ review for one of our domestic extension projects in Rhoose, Vale of Glamorgan

★★★★★ · Architect

31/03/2026

Thinking about extending your home or converting your loft?

Before you call a builder, it's worth speaking to an architect — and here's why.

The most expensive mistakes on home improvement projects almost always happen early. A poorly positioned extension, a loft conversion with insufficient headroom, or a planning application submitted without proper drawings — these are problems that cost far more to fix than they would have cost to avoid.

At Dennis Hellyar Architects, we work with homeowners across South Wales at every stage — from an initial chat about ideas right through to inspecting the finished work on site. We're not here to make things complicated. We're here to help you get the result you're hoping for, without the headaches.

We've written a new guide for homeowners and landlords that walks through what to expect from working with an architect, what questions to ask, and what the process looks like from start to finish.

Have a read and let us know if you have any questions

Thinking of extending your home, converting your loft, or improving a rental property? Discover why working with an experienced architect saves time, money and stress — and adds lasting value to your property.