Flat Conversion Services in London
Converting a single dwelling into multiple flats is a strategic way to maximize property value, but it requires navigating a complex layer of planning regulations. Whether you are looking to divide a large Victorian house into apartments or repurpose a commercial building into residential units, our professional architectural services provide the legal certainty you need. We move beyond simple paperwork to provide a robust legal shield, ensuring that future buyers, mortgage lenders, and local authorities have absolute confidence in the lawfulness of your development. By combining deep planning law expertise with high-precision architectural drawings, we streamline the application process to protect your investment and eliminate the risk of costly enforcement actions.
What is Flat Conversion Planning?
A flat conversion application is a formal request for Full Planning Permission to change the legal status and internal layout of a building from a single unit to multiple self-contained residences.
- Grants Legal Authority: It provides the formal approval from the council to modify the building’s usage and structure.
- Policy Assessment: Your project is assessed against strict design standards, including minimum space requirements, soundproofing, and amenity space.
- Community Consultation: As part of the process, neighbours are formally asked for their opinions on the impact on local parking and services.
- Final Decision: The council can approve the plans, refuse them, or approve them with specific conditions to ensure the quality of the new housing.
Types Of Certificate of lawfulness
Certificate of Lawfulness – Proposed Development
(CLOPUD)
Get legal peace of mind before you build. This certificate confirms that your planned extension, loft conversion, or outbuilding falls under “permitted development.” It’s a vital step for ensuring your investment is legally protected before work begins.
Certificate of Lawfulness: Existing Development
(CLEUD)
Formalize what’s already there. A CLEUD confirms that an existing structure or use of land is lawful. This is essential for works completed without prior planning permission that have been in place for more than four years (or ten years for changes of use).
When You Need Planning for Flat Conversions
Because converting a house into flats significantly changes the intensity of use, it almost always requires a formal application. Common scenarios include:
- Subdividing a House: Splitting a single-family home into two or more separate flats.
- Commercial to Residential: Converting offices, shops, or warehouses into multiple residential units.
- Retroactive Regularisation: Seeking legal approval for a conversion that was completed without prior consent.
Our Conversion Process
We manage the technical complexities to ensure your project meets all legal requirements.
Feasibility & Policy Review
We assess your property against local planning rules and minimum internal space standards.
Architectural Drawings
You will receive professionally prepared drawings showing existing and proposed floor plans, including layouts for kitchens and bathrooms
Supporting Statements
We prepare comprehensive reports addressing matters like refuse storage, cycle parking, and transport impact
Council Liaison
We submit your application and handle all correspondence with the local planning authority throughout the 8-week process
Why Choose Online Architectural Services
Navigate London’s planning regulations with confidence. Our experienced team handles all aspects of planning applications.
London Borough Expertise
Deep knowledge of all 32 London boroughs and their specific planning requirements
High Approval Success Rate
Proven track record of successful LDC applications across London
Council-Compliant Drawings
Professional architectural drawings that meet all local authority standards
Fixed Pricing
Transparent, competitive pricing with no hidden fees or surprises
Fast Turnaround
Quick preparation and submission to meet your project timelines
Related Services
Building Regulation Drawings
Compliant technical drawings for building control approval.
Frequently Asked Questions
Can I use Permitted Development for flat conversions?
Generally, no; converting a single house into flats falls outside standard permitted development and requires a full application.
What are the minimum space standards?
Councils have strict rules on the internal square footage required for each flat to ensure high living standards.
Will my neighbours be consulted?
Yes, neighbours are notified and invited to provide their opinions, particularly regarding potential noise or parking issues.
How long does the process take?
Local authorities typically take 8 weeks to determine a conversion application.