House Extension Plans in Cardiff

Planning a house extension in Cardiff requires a balance between good design and a clear understanding of local planning requirements.

Properties across the city vary from traditional terraced houses to suburban homes, often with constraints such as conservation areas or neighbouring context to consider.

At Dennis Hellyar Architects, we design house extensions and prepare professional plans for homeowners across Cardiff, helping you move from initial idea through to planning with clarity and confidence.

We also work with homeowners in Swansea, across the Vale of Glamorgan, wider South Wales, Bristol and the South West.

What you need

What drawings are needed for a house extension?

Most extension projects require:

  • Existing and proposed floor plans

  • Elevations

  • Site and location plans

  • Design development drawings

We prepare all required drawings and guide you through the process.

Local Context

Planning and design in Cardiff

Many Cardiff projects involve working within established residential areas, where careful design is needed to respond to neighbouring properties and local planning policies.

We provide clear, practical advice tailored to your property and location.

Service

  • Consultation

  • Survey

  • Concept design

  • Developed design

  • Preparation for planning

For a general overview of our service, see House Extension Plans

If you already have a clear idea and need drawings prepared, see Planning Drawings Cardiff

If you’re planning a house extension in Cardiff, we can help you take the next step with clear, professional plans.

Contact us to discuss your project.