Architecture
Simplified
Plans, drawings and planning permission for any building project in London.
80+ projects and growing • From £1,295 • Fixed price
Resources • Updated October 2025
Everything you need to get started
Free tools and expert guides for your London extension
Do I Need Planning Permission?
See if your project qualifies and could save thousands in design and planning fees.
How Much Will My Extension Cost?
Get estimates for our design fees plus realistic construction costs from builders.
Popular guides
Learn from real London projects
Build Without Planning Permission
Complete guide to Permitted Development rights. Find out what you can build without planning permission in London.
What Does an Extension Cost?
Real costs from 5,000+ London extensions. Ground floor, loft, and side return prices by area.
Side Return Extensions
Everything about side returns. Typical costs £55k-85k, planning rules, and kitchen integration.
Loft Conversions
Complete loft conversion guide. Dormer, hip-to-gable, and mansard costs. Building regs and planning explained.
Rear Extensions
Single and two-storey rear extensions. Costs, size limits, design options, and planning requirements.
Extending a Terraced House
Extension options for terraced houses. Size limits, party walls, side returns, and wrap-around designs.
Building in Conservation Areas
What you need to know about conservation areas. Restricted rights, planning requirements, and costs.
Building Regulations Explained
Understanding building regs for extensions. Structural, fire safety, insulation, and ventilation requirements.
Party Wall Agreements
Everything about the Party Wall Act. When required, the process, costs (£700-1,500), and neighbour disputes.
Two Storey Extensions
Building up. Costs £130k-150k, planning permission, design considerations, and structural requirements.
Extending a Semi-Detached House
Extension options for semi-detached houses. Size limits, rear and side extensions, and loft conversions.
Kitchen Extensions
Creating open-plan kitchens. Bi-fold doors, lighting, costs £75k-120k, and layout options.
How Long Does an Extension Take?
Complete timeline from design to completion. 6-12 months typical. Planning, building regs, and construction stages.
Architect or Online Service?
Honest comparison of traditional architects vs online services. Costs, design quality, and when to use each.
Project examples
Real projects with real costs.
FAQ
Questions
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