Business Details
Your Trusted Architects in London for Residential Extensions
Extension Plans UK is a dedicated team of architects, technicians, and surveyors committed to delivering high-quality residential architectural services tailored to individual client visions. With a focus on cost-effective solutions, we specialise in residential extensions, loft conversions, and outbuildings, ensuring every project aligns with both client aspirations and regulatory standards. Our team combines technical expertise with creative design to transform spaces while maintaining compliance with building regulations and planning permissions.We pride ourselves on a streamlined process that minimises delays, offering fixed pricing and a 100% money-back guarantee if planning applications are refused. Backed by over 600 five-star reviews, our approach includes end-to-end support, from initial consultation to builder recommendations, ensuring a stress-free experience for homeowners across London.
Services
Architectural Design
Building Regulations
Planning Permission
Structural Engineering
Party Wall Notices
Highlights and features
- We are ARB-registered architects with over 2000 successful projects completed.
- Our 100% money-back guarantee ensures confidence in planning approval success.
- All-inclusive service eliminates the need for outsourcing any project components.
- Fixed pricing and 12-day turnaround for architectural drawings provide budget certainty.
- Dedicated team with local expertise in London council planning requirements.
Associations and certifications
- ARB
What people say
Competitive pricing
Swift response
Great service
Professional and available
Top notch
Services
Architectural Drawings
Our ARB-registered architects create detailed residential designs using industry-leading software. We specialise in bespoke solutions for extensions, conversions, and new builds, ensuring compliance with planning and building regulations. Each project receives tailored attention to maximise space and property value.
Planning Permission
We manage full submission processes to London councils, leveraging 7+ years of local authority experience. Our team provides strategic design guidance to maximise approval chances, with a 100% refund guarantee if applications fail. This includes all necessary documentation and council liaison.
Structural Engineering
Partnering with qualified engineers, we deliver precise structural calculations for beams, foundations, and load-bearing elements. This service ensures safety compliance and construction feasibility, integrated seamlessly with architectural plans to prevent delays during building phases.
Party Wall Notices
We prepare and serve party wall notices in accordance with the Party Wall etc. Act 1996. Our surveyors handle boundary-related legal requirements for shared walls, ensuring compliance and minimising disputes with adjacent property owners during extension projects.
Site Surveys
Our RICS-qualified surveyors conduct detailed property assessments to capture accurate measurements and site conditions. This foundational service informs all subsequent design work, ensuring plans reflect existing structures' exact specifications and limitations.
People
Philip Jennings
Managing Director
Philip founded Extension Plans UK with a focus on simplifying architectural services. With five years of leadership experience and property development expertise, he oversees operations while maintaining client-centric service standards. His approach prioritises clear communication and cost-effective solutions.
Cameron Spencer
Business Development Lead
Cameron manages operational strategy and service quality, overseeing 2000+ completed projects. With eight years in the business, he focuses on process optimisation and client satisfaction, balancing professional responsibilities with training his rescue dog Woody.
Rafael Ramirez
ARB Architect
As a registered architect, Rafael leads drawing production with meticulous attention to detail. He ensures all designs meet regulatory standards while maintaining creative integrity. With seven years of experience, his work forms the technical foundation for client projects across London.
Thant Kyaw
Surveyor
Thant conducts precise property measurements and site assessments, providing critical data for architectural plans. His surveying expertise ensures designs align with existing structures' physical constraints, forming an essential part of the pre-construction process.
Mackenzie Petcher
Studio Administrator
Mackenzie manages council applications and client communications, ensuring smooth administrative processes. She coordinates planning submissions and maintains regular updates for clients, combining organisational expertise with a focus on customer satisfaction throughout project lifecycles.
Questions
What architectural services do you specialise in?
We specialise in residential extensions, loft conversions, garage conversions, and outbuildings. Our services include architectural design, planning permission applications, building regulation drawings, and structural engineering calculations.
Do you handle planning applications with local councils?
Yes, we manage full planning applications for London properties. With 7+ years of experience working with all London boroughs, we prepare and submit documentation, act as your agent during the process, and offer a 100% refund guarantee if applications fail.
Are your architects fully qualified?
All our architects are ARB-registered professionals with proven experience in residential design. Our team includes architectural technicians and technologists holding relevant industry qualifications, ensuring technical compliance and design excellence.
What is your typical project timeline?
Initial site surveys occur within days of instruction. First draft plans are typically ready within 14 days, with revisions completed promptly. Project durations vary from 2 weeks to 4 months depending on complexity and council processing times.
Do you provide structural calculations?
Yes, we partner with qualified structural engineers to provide necessary calculations and beam specifications. This service is included in our building regulation package to ensure technical compliance and construction safety.
Can you recommend builders for construction work?
We connect clients with vetted builders through our network, providing multiple quotes for construction phases. Our builder recommendations consider project requirements, budget, and quality standards to ensure successful build outcomes.
Reviews (7)
Phong Luu
Aug 31, 2021
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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
Timothy Charles
Jun 20, 2021
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Positive:Professionalism
A very professional company. Very efficient from start to finish. Do not hesitate to use if you're looking for any architectural drawing work.
very impressed !!
A very professional company. Very efficient from start to finish. Do not hesitate to use if you're looking for any architectural drawing work.
very impressed !!
Gerry Saint
May 25, 2021
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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!
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
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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
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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
Phil Morris
Feb 25, 2021
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I found Extension Plans UK on-line, read the reviews but was wondering how they could do what they do at at such a cheaper price than others. I'm so glad I made the decision to use them, I dealt with both Phil and Cameron and found their customer service very helpful and the quality of work as been great. You don't need to look any further than Extension Plans UK to help you with your building design needs. Highly recommended.
Andy McDaid
Nov 16, 2020
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Highly recommended - great plans and excellent value
Philip was very helpful and provided a truly professional set of plans for our new build property from our own design. He dealt with all our queries and ensure that our design worked out properly and dealt with a couple of amendments we wanted to make once he had finalised the plans without any extra charge.
Philip was very helpful and provided a truly professional set of plans for our new build property from our own design. He dealt with all our queries and ensure that our design worked out properly and dealt with a couple of amendments we wanted to make once he had finalised the plans without any extra charge.
