Double Storey Extension Guide: Planning Permission, Design Ideas and Costs
A double-storey extension is one of the most effective ways to transform an existing house without the financial strain of moving house. For many homeowners,
|
Criteria
|
RIBA Chartered Architect (ARB Registered)
|
Unregistered Architectural Designer
|
|---|---|---|
|
Professional Qualification
|
Must have completed RIBA Part 1, 2, and 3, plus ARB registration
|
No formal qualifications required (varies by individual)
|
|
Regulatory Body
|
Regulated by the Architects Registration Board (ARB) and Royal Institute of British Architects (RIBA)
|
No regulatory oversight
|
|
Code of Conduct & Ethics
|
Must adhere to strict professional standards
|
No mandatory code of conduct
|
|
Insurance
|
Must have Professional Indemnity Insurance (PII)
|
May not have insurance or lower coverage
|
|
Design Expertise
|
Trained in advanced design principles, sustainability, and complex structures
|
May have practical experience but not necessarily formal training
|
|
Legal Protection
|
Protected title: Only RIBA and ARB-registered professionals can legally call themselves “Chartered Architects”
|
Cannot use the title “Architect” legally
|
|
Planning & Building Regulations
|
Extensive knowledge of UK Building Regulations & Planning Policies
|
May have knowledge but lacks formal accountability
|
|
Project Management
|
Trained in contract administration, risk management, and budget control
|
May lack experience in contract law
|
|
Construction Knowledge
|
In-depth technical understanding of materials, structures, and sustainability
|
May have practical knowledge but lacks formal education in complex structures
|
|
Client Protection
|
Clients can report misconduct to RIBA or ARB
|
No official body to report malpractice
|
|
Cost
|
May have higher fees due to expertise, experience, qualifications insurance, and regulation
|
May be cheaper but with potential risks
|
|
Best for…
|
Complex projects, listed buildings, high-quality bespoke design
|
Small and basic extensions, interior layouts
|
A double-storey extension is one of the most effective ways to transform an existing house without the financial strain of moving house. For many homeowners,
For many homeowners, the moment they start planning an extension, renovation, loft conversion, or new build, one question quickly follows: how much does an architect
Many homeowners reach a point where their current space no longer works. Moving to a larger house is one option, but it often comes with