About Us

Alexander Design Build is a family run business in the heart of Penarth, South Wales. We're a skillful, multidiscipline company offering our customers the very best in planning and construction services.

We have a wealth of experience and have been at the centre of many wonderful projects to date. Whether you're looking at re-development, new build or are looking for that little something extra, get in touch today and let our team grow your ideas into a finished project to be proud of.

Architectural Design

We offer design services for any project, including kitchen and bathrooms. Also we offer full drawing packages for planning permission and building regulations.

Home Improvement

We have extensive experience in replacing tired kitchens and bathrooms. Also offer services to redesign and streamline ineffective house layouts.

New Build

Along with full design services we have extensive experience in constructing new build property. We can offer all aspects of project management and a comprehensive construction team.

Planning Consultation

Our team can guide you through the planning process and offer services to take problematic sites through all stages of cleanup and redevelopment.


We have facilities to provide bespoke metalwork and full carpentry services. We also undertake conservatory and glass balustrading projects.


We cover all property maintenance issues including guttering, roofing, damp and chimneys. We currently work with a large estate agent and install Drimaster systems.

Our Team


New Roof, Canton

Home Improvement

Custom Metalwork, Penarth

Home Improvement

Bathroom Tiling, Penarth

Home Improvement

Kitchen Tiling, Penarth

Home Improvement

Flat, Penarth


Eco Houses, Sully

New Build

Garden Room, Oxfordshire

Home Improvement

New Decking, Penarth


Loft Strengthening, Cardiff


Oak Truss, Cardiff


Sink & Toilet Unit, Cardiff


Jewellery Box


New Plumbing Merchants


2 New 4-Bed Houses, Llantwit Major


Extension, Fairwater



We have many happy clients and still growing. Here's what a few said about our work:

  • "Reliable and professional. James instilled a confidence in me that he would take care of everything."

    Pip Hill - John, Rolfe's the Florist

  • "Thank you for the great job done on our apartment and we will be happy to recommend you to others in the future. "

    Christopher Price, Financial Consultancy Ltd

  • "Very forthcoming and accommodating. I'm very grateful for the opportunity to work with such an established builder."

    Adam Belby, AWB Electrical Services

  • "I would like to thank James and his team for a truly exceptional service at very cost effective rates. I will not hesitate to recommend his company on."

    Andy Rogers, Xpedient Print

4 The Glades, Penarth, Vale of Glamorgan, CF64 3AY

T. 07974 295565 / 07973 914235 / 02920 708232
E. info@alexanderwelsh.co.uk

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Want to say hello? Want to know more about us? Give us a call or drop us an email and we will get back to you as soon as we can.