The Modular Designs

79 Hartfield Avenue, Elstree, Borehamwood, Hertfordshire, WD6 3JJ Directions

   Closed today Open Monday 09:00 - 17:30

Why Choose Us?

Affordable Prices
High Quality

Business overview

we make luxury, bespoke, eco-friendly structures are quick to build. We offer a wide range of options: garden rooms (all our garden rooms are made to order), extensions and more.

Do you need more space in your garden or home?

We operate all over London and Hertfordshire and we offer a wide range of options.

Including garden rooms, garden office, gymnasiums, pool plant rooms, treatment rooms and new homes, home extensions and roof extensions.

Our luxury bespoke eco-friendly structures are created by experienced designers and master craftsmen.

Quick to build, they're secure and fire-safe; cool in summer and warm in winter.

All our garden rooms are made to order, so we maintain flexibility in terms of creating a design that suits your needs and budget.

They start from as little as £10,000 all inclusive. And our sizes start from 2. 5m x 2. 5m, up to whatever your garden will allow.

In every project we use modern methods of construction.

Concrete cladding on the outside, in a range of no fade colours, directions, and it's maintenance free.

Ground screws: these don't need any digging so it leaves your gardens clean, can over come challenges like trees. They are economical, green and quick and easy to install.

SIP panels: These have high thermal properties so your structure will stay warm regardless of the weather. They are also waterproof, fire - retardant, economical and quick and easy to install.

EDPM: This used recycled tyres to give you a strong rubber roof.

Imagine walking into your new luxury garden room or extension for the first time.

A beautifully designed, eco-friendly and comfortable space where you can work - or work out - in peace; space for house visitors so they're not under your feet, care for an elderly or ill loved one in calm, convenient place, or somewhere to send your teenagers when they want to binge-watch terrible TV. - call us for a consultation.


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Office interior
Plant, pool, shower room, relaxing space
Ground screw foundation

Products & Services



house extensions

roof extensions

Garden Furniture

Garden Sheds


Log Cabins

Garden Dome


Garden Room



Roof Extension

Garden office

Home office


Treatment room

Therapy room

Pool Plant room


Very pleased with our Modular Designs Extension - Highly Recommend

Modular Designs recently completed a ground floor extension for us and we couldn't be happier with the end result! We always knew that we wanted to extend our house but we lacked the creative thinking of how to make the best use of our space. From day 1 Howard was great and gave us loads of ideas, his enthusiasm and creative foresight convinced us that he and Modular Designs were the right people to help us achieve our dream extension. Howard and his team were brilliant and organised everything for us from architect, buildings control, builders, electricians, plumbers, decorators and all supplies. They took all the stress out of our hands of having to manage our build. Not only that, everyone involved throughout the build was friendly, hard-working and very professional. I highly recommend Modular Designs and know that if we were to ever undertake another building project in the future then Howard would be out first point of call. Thank you Modular Designs for everything!
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