You Dream It. We Plan It.

Home Extension Design Specialists

Google review badge with five stars and the logo of an architecture services company named Plan It UK, featuring a house drawing and Google colors.

Making spaces you can take pride in.

1,750 Extensions Designed

Plan It UK is an award-winning architectural planning business based in London specialising in home extensions, and loft conversions.

We take care of everything from planning your build to planning your application. Get in touch for a free consultation today.

BOOK YOUR FREE CONSULTATION

Why choose Plan It UK for your project?

  • Full design management handling the whole process, getting you build ready.

  • As a team, we have delivered over 1,750 projects.

  • Focused on home extensions with Fixed Prices

  • We work hard to to ensure your project has the best chance of approval.

  • We are recommended by over 50 Extension Building Companies across London, Kent and Essex.

Our Services

  • Photo of a completed modern extension

    Extension Plans

    Investing in an extension is an investment in your home, and your happiness within it. That’s why we provide modern, considered extension plans designed to maximise value in every way. Let’s have a chat and see what’s possible.

  • Photo of a bright loft conversion

    Loft Conversion

    Building up rather than out can be a really clever and lucrative way to add value to your home. We plan and design loft conversion extensions in London that focus on realising the full potential of an otherwise unused space. Whether it’s a scaffold-free renovation, the addition of a loft staircase or a full-on loft conversion – we can draw up a plan for you.

  • Photo of a new build property

    New Builds

    Take the stress out of your new build planning application, and leave it to us. We have an extensive network of specialist planning consultants who we work with to optimise your submission for approval. If you are even just considering a new build project, get in touch for a free consultation and we can explore possible routes. The earlier, the better.

  • People making changes to architectural drawings

    Structural Design

    Most design companies will ask you to find your own Structural Engineer. But at Plan It UK, we have our own dedicated team ready to work on the perfect framework for your build. We will prepare the design and structural calculations for all the steel beams, roof and floor joists, while satisfying building control and making life easy for your contractor.

A Picture is Worth a Thousand Words

Which is why when it comes to choosing the right solution for your home extension, seeing is very much believing. Browse some of our completed projects below, or click here to view more.

Backyard with a patio, lawn, and a two-story house with a tiled roof and large windows, under a clear blue sky.

Brownspring, SE9

Modern kitchen with white cabinets, black tile backsplash, marble countertops, and built-in appliances, with a window showing greenery outside.

Cobden House, ME17

Bright living room with a blue couch, wooden flooring, and sliding glass doors leading outdoors. A television is on the left wall panel, and there's a dining table with chairs near the doors.

Norwood Hill, SE25

Completed Projects

We've completed 1,750 projects across London, Kent, Essex and the surrounding areas. The majority of our projects are in the following areas:

Kent Councils: Sevenoaks, Tunbridge Wells, Tonbridge and Malling, Maidstone, Ashford, Canterbury, Dartford, Gravesham, Swale & Thanet.

South East London Councils: Bromley, Greenwich, Bexley, Lewisham, Southwark, Lambeth, Croydon, Sutton, Merton & Wandsworth

Essex Councils: Basildon, Braintree, Brentwood, Castle Point, Chelmsford, Colchester, Epping Forest, Harlow, Maldon, Rochford, Tendring, and Uttlesford

Two men standing in front of a detailed architectural blueprint of a building. Both are wearing black shirts with a house logo and 'Plan It Design & Build' embroidered on them.

Harry Dunn Managing Director and Co-Founder, Frazer Day Design Director and Co-Founder,

“At Plan It, we pride ourselves on giving our customers the service they truly deserve. From day one, we’re transparent - the price you see in your quote is the price you’ll see on your invoice.

We offer a complete turnkey service, handling everything from planning research and drawings to structural engineering packages, building regulations, and technical approvals such as party wall notices, building control applications, and build over agreements.

Don’t have a builder? No problem. We can introduce you to our trusted network of vetted contractors to help bring your project to life.

Thanks to our streamlined services and detailed processes, we’re often more affordable than like-for-like competitors - all while maintaining the highest standards of quality and care.

At Plan It, we don’t just design homes, we design dream homes for our dream customers, delivering every project with efficiency, integrity, and peace of mind.”

See what we’re up to!