Step-by-Step Guide to Designing a House Extension

A Guide by Forma Architecture

Extending your home is an exciting opportunity to create more space, improve functionality, and add value to your property. At forma architecture, we follow the RIBA Plan of Work, a trusted framework in the UK, to ensure a structured and efficient design process. Whether you're in London, Manchester, or anywhere nationwide, our approach helps you navigate planning, design, and construction with confidence.

Step 1: Preparation & Brief (RIBA Stage 1)

The process begins with understanding your requirements, budget, and aspirations. At this stage, we:

  • Discuss your goals and priorities

  • Advise on planning feasibility and any constraints

  • Recommend a measured survey of your home

  • Explore initial ideas for your extension

Step 2: Concept Design (RIBA Stage 2)

With a clear brief, we develop creative design concepts tailored to your needs. This includes:

  • Producing sketch designs and 3D visualisations

  • Exploring different layout options to optimise space and natural light

  • Reviewing planning policies to ensure compliance

  • Refining the design based on your feedback

Step 3: Developed Design & Planning Application (RIBA Stage 3)

Once a preferred concept is agreed, we refine it further and prepare for planning submission:

  • Develop more detailed architectural drawings

  • Incorporate structural and sustainability considerations

  • Liaise with planning consultants if necessary

  • Submit the planning application and manage council communications

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Bring your home vision to life

Ready to create a home that reflects your lifestyle, values, and needs? Let's make it happen together. Whether you want to build, renovate, or extend, we’ll guide you from initial concept to planning approval and construction. Schedule a free 30-minute consultation to get started.

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Step 4: Technical Design & Building Regulations (RIBA Stage 4)

After planning approval, the design is developed into a technical package:

  • Create detailed construction drawings and specifications

  • Coordinate with structural engineers and other consultants

  • Submit applications for building regulations approval

  • Prepare tender documentation if you are seeking contractor quotes

Step 5: Construction & Project Oversight (RIBA Stages 5-6)

With approvals in place, construction can begin. FORMA Architecture can:

  • Assist in selecting a contractor

  • Provide site visits and project oversight

  • Ensure quality control and adherence to the design

  • Help resolve any issues during construction

Step 6: Completion & Handover (RIBA Stage 7)

The final stage ensures everything is completed to a high standard:

  • Conduct a final inspection

  • Address any snags or minor adjustments

  • Provide documentation and maintenance guidance

Thinking About a House Extension?

At forma architecture, we specialise in designing bespoke, high-quality home extensions across the UK. If you're considering extending your home and want expert guidance, book a free 30-minute consultation today. Alternatively, you can get in touch via our contact page, or email us at directly hello@formaarchitecture.co.uk

Why Choose Forma Architecture?

✅ Experienced in residential extensions nationwide
✅ Bespoke, client-focused design solutions
✅ Expertise in planning applications and building regulations
✅ Clear and structured process following the RIBA Plan of Work

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