Extension Plans UK

Business Details

Trusted Architects for Residential Extensions in London

We are a dedicated team of architects, technicians, and surveyors committed to delivering high-quality residential design solutions tailored to individual client needs. Our expertise spans architectural design, planning permission, building regulations, and structural engineering, with a focus on cost-effective, end-to-end project management. With over seven years of experience collaborating with London councils, we ensure compliance and efficiency in every project.

Our ARB-registered architects and qualified engineers provide detailed drawings, 3D visuals, and structural calculations, supported by a 100% money-back guarantee if planning is refused. We pride ourselves on transparency, fixed pricing, and a streamlined process that eliminates outsourcing, ensuring a seamless journey from concept to completion.

Services

Architectural Design Planning Permission Building Regulations Structural Engineering Party Wall Notices Loft Conversions Rear Extensions 3D Visuals Permitted Development Notice of Prior Approval

Highlights and features

We are ARB-registered architects with a 100% money-back guarantee if planning is refused
Our all-inclusive service eliminates the need for outsourcing
Fixed prices and 12-working-day turnaround for architectural drawings
Over 7 years of experience with London councils and 2000+ successful projects
Dedicated team of qualified architects and engineers with 3D visualisation expertise

Associations and certifications

ARB

What people say

Competitive pricing Swift response Professionalism Great service Successful planning approvals

Website

Update Listing

Services

Architectural Drawings

Our ARB-registered architects create detailed residential designs tailored to client needs. Using industry-leading software, we produce precise drawings for extensions, conversions, and new builds. Our 12-working-day turnaround ensures swift progression to construction while maintaining compliance with local council requirements.

Planning Permission

We manage full planning applications for London properties, leveraging 7+ years of council collaboration. Our team submits documentation, acts as agent during review, and guarantees 100% refund if applications are refused. This includes permitted development and prior approval notices where applicable.

Building Regulations

Our technical team produces detailed drawings meeting safety, thermal, and structural standards. We handle submissions to building control authorities and coordinate structural calculations by partnered engineers, ensuring construction compliance without outsourcing requirements.

Structural Engineering

Partnered engineers provide precise calculations for beams, foundations, and load-bearing elements. This service ensures structural integrity while maintaining alignment with architectural designs, delivered as part of our comprehensive project management approach.

Party Wall Notices

We prepare and serve party wall notices in accordance with legal requirements. Our surveyors manage shared wall modifications, ensuring neighbour compliance and documentation through the entire process from notification to completion.

People

Philip Jennings

Managing Director

Philip founded Extension Plans UK with a focus on simplifying architectural services. With property development expertise, he oversees operations and client strategy while maintaining hands-on involvement in complex projects.

Cameron Spencer

Business Development Lead

Cameron has managed over 2000 successful projects in his 8 years with the company. He focuses on service improvement and operational efficiency while overseeing project delivery timelines.

Rafael Ramirez

ARB Architect

As a qualified ARB architect, Rafael oversees drawing quality and technical standards. With experience across diverse residential projects, he ensures compliance with council regulations and client specifications.

Mackenzie Petcher

Studio Administrator

Mackenzie manages council applications and client communications. Her role ensures smooth administrative processes and timely updates throughout the planning and building regulation stages.

Rebecca Parnell

Studio Administrator

Rebecca coordinates council interactions and application tracking. Her administrative oversight maintains high approval rates and ensures compliance with evolving planning requirements.

Questions

What services do you offer?

We provide architectural drawings, planning permission, building regulations, structural engineering, and party wall notices for residential properties across London.

Do you handle planning applications?

Yes, we manage full planning submissions including permitted development and prior approval notices, acting as your agent throughout the council approval process.

How long does a project take?

Initial site surveys occur within days, with draft plans delivered in 14 days. Project timelines vary from weeks to 4 months depending on complexity and council requirements.

Are you qualified architects?

Yes, we employ ARB-registered architects and qualified engineers to ensure compliance with all technical and regulatory standards.

Do you offer 3D visualisations?

Yes, we create 3D renders using industry-leading software to help visualise your completed project before construction begins.

What happens if planning is refused?

We offer a 100% money-back guarantee on drawings if your planning application is refused, subject to specific terms and conditions.

Reviews (5)

Write a Review

Phong Luu

Aug 31, 2021 Report

Extension plans UK helped me out of a really tough spot that my previous Architecture firm left me in such as incomplete or inaccurate designs which did not pass Building Regulations. I approached Extension plans UK to salvage the project and they have been absolutely amazing. They were responsive and professional to ensuring the project(2 storey side + rear extension project) was approved by building regulations(BR). They professionally listed all the steps and executed on them without any delays. They clearly demonstrated experience and expertise when it comes to property extension projects

Gerry Saint

May 25, 2021 Report

Positive:Professionalism,Quality,Responsiveness,Value
Recommended! We found Extension plans uk via an on line advert. After researching their company and communicating with them we decided to go with them. They were competitively priced and we found their service to be simple, hassle free and reliable. If you are looking for this kind of service then look no further!

Carolyn Corbett

Apr 20, 2021 Report

We can't rate Extension Plans UK highly enough. The service we have received has been excellent and everything has been done in a timely manner. They are very professional operation, extremely responsive to any queries and nothing is too much trouble. From our first enquiry on the 18/01/21 we had our plans passed by the local council on 12/04/21, truly amazing!!

Victoria Behun

Mar 17, 2021 Report

So so happy! Found Extension Plans UK online while looking for affordable architects who don't compromise on quality. We were after something very particular, and from the first time we spoke on the phone following the online quote, I could tell they'd do a great job. They are professional, polite, quick to respond, extremely helpful and very considerate of the client's requests. We got the loft conversion & ground floor extension drawings done, as well as the building regulation drawings, party wall agreement and Thames Water manhole relocation plans. Everything was handled perfectly and saved

Irfan Dabhad

Sep 09, 2020 Report

Thank you Extension Plans. Excellent service with always a constructive, thorough, positive approach and good effective communications. I would not hesitate to recommend to others.