01 / Comprehensive homeowner guide
The Complete Guide to House Extensions
A clear route through extension types, design choices, planning, costs, Building Regulations and the complete project process.
Read the GuideResidential 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.
Featured Guides
02 / Essential reading
Planning Permission Explained
Understand the principal planning routes, permitted development and how residential proposals are assessed.
Read Planning Permission Explained
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
House Extension SolihullUse the complete guide for an editorial overview, then move into the practical resource or service that fits the stage your project has reached.
Complete Guide to House Extensions House Extension Costs in 2026 House Extension Timeline House Extension Design Ideas Downloadable House Extension Guide House extension architectural service Estimate architectural fees Browse extension projects
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
Residential
House Extension Solihull
Solihull
Apartment Block
New Build Apartments Cornwall
Cornwall
New Build Dwelling
Replacement Bungalow
Upton Upon Severn
Residential
Eight-Home Residential Masterplan
West Midlands
Residential
Traditional Barn conversion Northumberland
Northumberland
Residential
Ten-Home Residential Masterplan
Birmingham
Latest from the Studio
BOPP Discovery Day: Property Networking and Expert Insight in Knowle
We take a closer look at BOPP, a monthly property networking community bringing together investors, business owners and experienced industry professionals, ahead of its Discovery Day in Knowle on 5 August.
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Why a Planning Approval Does Not Mean Your Extension Is Ready to Build
Summary Receiving planning is an important milestone, but it does not mean an extension is ready for construction. This guide explains the additional drawings, technical information needed before building work begins.
Read article
Future Homes Standard 2026: A Homeowner’s Guide
The Government has now published the Future Homes and Buildings Standards, introducing updated requirements for energy efficiency, heating systems, ventilation and renewable electricity generation.
Read articlePopular Questions
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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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