01 / House extension architectural services
House Extension Design and Planning Services
A clear route from feasibility and concept design through planning, Building Regulations and the complete project process.
Explore House Extension ServicesResidential Architecture Guidance
Residential Architecture Knowledge Centre
Clear, practical guidance for homeowners, property investors and small developers navigating design, planning permission, Building Regulations, house extensions and residential development.
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02 / Essential reading
Planning Permission Explained
Understand the principal planning routes, permitted development and how residential proposals are assessed.
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03 / Essential reading
Building Regulations Explained
An introduction to technical approval, compliant design information and the responsibilities behind a safe build.
Read Building Regulations ExplainedPlanning and Technical Guidance
The guides explain the systems and questions likely to shape a project. The service pages explain how Hepburn Architects can prepare, coordinate and submit the professional work required for a specific property.
Improving and Extending Your Home
A Simple Pitched-Roof Extension in HarborneUse the complete guide for an editorial overview, then move into the practical resource or service that fits the stage your project has reached.
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Free homeowner resource
Download the House Extension Guide
A practical companion covering planning permission, budgeting, design decisions, the extension process and common mistakes to avoid.
Get the Free GuideArchitecture in Practice
Small pitched-roof rear extension
A Simple Pitched-Roof Extension in Harborne
Harborne, Birmingham
Apartment Block
New Build Apartments Cornwall
Cornwall
Detached replacement dwelling
Replacement Dwelling, Birmingham
Birmingham
Residential masterplan
From Land to Layout: Testing the Potential for New Homes in Birmingham
West Midlands
Full-width rear dormer loft conversion
Modern Dormer Loft Conversion in Solihull
Solihull, West Midlands
Full-width rear dormer loft conversion
Modern Dormer Loft Conversion in Sutton Coldfield
Sutton Coldfield, West Midlands
Latest from the Studio
Solar Panel Planning Rules August 2026
Solar panel permitted development rules change in England on 27 August 2026. Find out what the new rules mean for homeowners, wall-mounted solar, plug-in systems and planning permission.
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From Garden Land to Development Opportunity: Assessing the Potential for a Small Residential Scheme
An illustrative feasibility study showing how access, planning, neighbours, ecology, drainage and viability shape the realistic potential of garden land.
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Biodiversity Net Gain Rules Changed in August 2026 – What Small Developers Need to Know
Biodiversity Net Gain rules changed on 6 August 2026. Here is what the new 0.2-hectare exemption means for small developments, self-build homes and planning applications.
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New Build HomesComing soon
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Project-specific guidance
Need advice for a specific property?
General guidance is useful, but the correct design, planning and technical approach depends on the property, planning history, site constraints and proposed work.
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