...
Request a Callback

Residential Architecture Experts

Unlock the full potential of your property and simplify the journey

With out fast leo.

We are with you all the way

Welcome to Extension Plans, your premier Barnet architects, specialising in residential architecture, home extensions, and loft conversions. Our team of expert residential architects is committed to turning your home dreams into reality, offering affordable and efficient solutions.

At Extension Plans, we revolutionise residential architecture by delivering cost-effective home extension and loft conversion services without compromising on quality.  

Discover a new era of architectural efficiency and let us enhance your living space with our expertise in home extensions and loft conversions.

Why We're Your Ideal Partner

ARB Architects

Talented architects with proven track records drive our projects.

Cost-Effective

Save money with our Budget friendly services, delivering exceptional results

All Inclusive

Don't worry about outsourcing any aspect of your project with our comprehensive service

Quick Turnaround

Progress to the construction stage with minimum delay with our streamlined service.

Extending your property

Our Services

We pride ourselves on delivering an all-inclusive architectural service to our clients, with a vast amount of experience, with rear extensions, loft conversions, and outbuildings. By working with us, you eliminate the need to outsource various components of your project, streamlining the entire architectural process under one roof.
Site Survey

Our dedicated surveyor will visit your property to gather all of the necessary measurements and essential site information.

Architectural Design Drawings
Upon appointing our services, you’ll be paired with the most suitable member of our design team, ensuring a tailored approach to your project.
Planning Submission
We take the hassle out of the approval process by handling the submission of all planning applications to the local council.
Building Regulation drawings
Our designers create detailed building regulation drawings with precision, ensuring full compliance with standards and reducing potential construction issues.
Building Control Submission

Our team is committed to providing a hassle-free experience, and that includes submitting the building control application on your behalf. Trust us to handle the paperwork and navigate through the process.

Structural engineering service
We partner with expert engineers to provide precise structural calculations, ensuring the safety and stability of your construction.
Finding a builder
Once the paperwork is complete, we arrange build quotes from vetted, quality-checked builders, ensuring your project is in skilled hands for a smooth construction process.
3D Visuals
Enhance your design experience with realistic 3D drawings from our dedicated team, offering a detailed preview of your finished space.
Party wall notices
We collaborate with a party wall surveyor who handles the serving of party wall notices on your behalf, ensuring the process is managed as efficiently as possible.

How Do We Differ From Other Architects?

  • Features

  • Traditional Architects 

  • Online Competitors 

  • Fixed Price

  • Immediate Start

  • Planning Design Drawings 

  • Flexible project timeline

  • Qualified Architects 

  • Submission of all relevant applications

  • Building Regulation Drawings 

  • Advance Drawing Technology

  • Flexible Remote Meetings 

  • Book A Free Consultation With One Of Our Experts

    0

    Completed projects

    We have experience with every property type

    0 Day

    Plan Turnaround

    Get your project started without delay

    0 +

    5 Star Reviews

    We put our customers first

    0 +

    Years experience

    We have a vast amount of experience in this area

    What makes us stand out from the crowd

    Unlimited Support

    Call our office at any time to discuss your project. We are also on hand for questions from your builders until construction has been completed.

    We handle everything

    We have an experienced administration team to submit and handle your applications so you don't have to.

    Immediate Start

    We are available to start work on your project within a couple of days!

    Rear extension with planning permission approved, created by architects

    Dedicated Designers

    You will be working directly with the member of our team that is best suited to your project.

    Detailed Drawings

    Our drawings are created with the best architectural software available ensuring your plans are created to the highest standard.

    Fixed Prices

    We offer fixed, competitive prices so you can budget accurately for your build.

    Check out a couple of our recent projects

    Style your team members section exclusively with a full image and details in hover effects. Change the color of the overlay content to make it stand out.

    double storey extension with building regulations

    Part double part single storey rear extension in HA5

    crittall doors extension, kitchen extension design by architects

    Single storey rear extension with a dual-pitched roof and crittall doors in W5

    rear extension interior design, kitchen extension

    Single storey rear extension with open plan living space in TW7

    Spacious single storey rear extension with open plan kitchen/diner in DA5

    Rear extension design, created by architects with planning permission

    Single storey rear extension with open plan living space in TW7

    Kitchen design in extension space architects

    Wraparound Extension with new kitchen and living space in BR5

    What Our Customers Say

    We have over 600, five star reviews across our online platforms. Check out our Trustpilot reviews here 

    Unlock the potential of your property

    Schedule a free consultation! We would love to offer free advice, discuss your design ideas or get things moving with your project

    FAQs

    Our design process begins with an initial consultation with your dedicated designer. We will discuss your vision, requirements and we will provide ideas for your design based on previously completed projects. From there, we move through conceptual design providing a first draft plan for your consideration. Following this we can revise the plans in any way you like to ensure you a completely happy with the design. 

    The timescale of a project differs, depending on the proposal. We can visit your property within a couple of days and have the first draft plans with you in roughly 14 days. 

    In some cases, building work can begin within a couple of weeks. In others, the timescale can be up to 4 months, depending on your project’s requirements. 

    Yes, we work with a dedicated team of experienced engineers who take care of all structural calculations and beam specifications. This allows us to manage every technical detail, so you won’t need to outsource this essential service.

    Yes, we employ fully qualified architects within our design team to ensure our plans are created to the highest possible standard. 

    With over 7 years of collaboration with Barnet Council, we’ve built a trusted relationship with their planning officers and are well-versed in their guidelines. This expertise ensures a smooth and efficient planning process for your project.

    Yes, we organise all necessary applications on our customer’s behalf. We will submit the required application and act as the agent throughout the process to ensure approval is received as swiftly as possible

    Yes, we create our plans with industry-leading software and are able to create 3D images to allow you to accurately visualise your design. 

    In most cases, we have trusted building contractors that we have worked with in your area, in the past and we would be happy to organise build quotations for you to consider 

    Web Design SkiptonWeb Developer Skipton

    Copyright 2025. All Rights Reserved

    Seraphinite AcceleratorOptimized by Seraphinite Accelerator
    Turns on site high speed to be attractive for people and search engines.