House Extension Plans
If you’re planning a house extension, the first step is developing clear, well-considered plans.
These form the foundation of your project — helping you explore design options, understand what’s possible, and prepare for planning permission or permitted development.
At Dennis Hellyar Architects, we work with homeowners to design extensions and prepare professional drawings that move projects forward with clarity and confidence.
What are extension plans?
What do house extension plans include?
Existing and proposed floor plans
Elevations
Site and location plans
Design development drawings
These drawings allow you to visualise your extension and form the basis of planning submissions and construction information.
Our Approach
How we help you design your extension
Initial consultation
Understanding your requirements
Concept design options
Developed design and drawings
Preparation for planning
We guide you through each stage, helping you make informed decisions.
Planning & Next Steps
Once your design is developed, the next step is preparing planning drawings and submitting your application if required.
Cost
How much do house extension plans cost?
The cost of extension drawings depends on the size and complexity of your project.
We provide clear guidance following an initial consultation so you understand exactly what’s involved before proceeding.
Do you need an Architect?
While it’s possible to obtain basic drawings elsewhere, working with an architect ensures your extension is well-designed, compliant, and adds real value to your home.
Locations
Areas we cover
We work with homeowners across:
South Wales
& The South West
If you’re planning a house extension, we can help you take the first step with clear, professional plans.