Add an extra room to your home with a custombuilt Garden Room from

The perfect option for a Home Office, Garden Room, Studio, Home Cinema or Summerhouse and planning permission is rarely required. Multi-purpose use and as insulated as your home, our garden rooms are built to meet our customers needs.

Would you like to see our range of brochures?

The Garden Room

Built from Pod foundations with bespoke suspended steel insulation floors, tanalised pressure treated tumber, 80mm celotex insulation, breathable membrane, external cladding built with treated cedar and epdm one-piece roofs.

All windows and doors are pvc or aluminium energy A rated and high-security and all internals are plastered. LED lighting, sockets, armoured cable from your house and Part P certificate.

Also available is underfloor heating, laminate wood, floor tiles, decking, integral blinds etc.

Garden Rooms
Garden Rooms

Experienced Team

Our experienced building team will ensure that your garden room is designed, supplied and installed to your requirements.

We listen to our customers and pride ourselves on our commitment to excellence in service and quality.

We also offer end-to-end service including final décor and external landscaping if required.

Why Choose Us?

Price Match Guarantee

Ask us about our Price Match Guarantee, we will match any like for like quotation.

Purpose Built

For use as Studios, Offices, Summerhouses, Games Rooms or anything else you can think of.

Customer Requirements

Our Garden Room's are designed, supplied and installed to our customer’s requirements.

Experienced Team

We have a highly experienced building team for groundwork and brickwork.

Service and Quality

We stand by our commitment to excellence in service and quality.

End to end service

We take care of everything from start to finish, even final décor and external landscaping if required.

The Gardenroom policy

Our policy is not to employ salesmen, only tradesmen who will give free and accurate advice.

Site visits

We listen to your requirements, take measurements and explain our product.


Our detailed quotations are sent within 5 days, and include specifications and drawings.

See our soundproof room in action

Best Price Promise GUARANTEE*

*Provide us with a Like for Like quotation with the same features, specifications and warranties from a comparable company,and we will match the PRICE.
Call us on Now 01403 711 936

Do you need a quote?

Contact us now for a comprehensive FREE no obligation quotation.


Established in 1998, Window Mart have gone from strength to strength culminating in the opening of our new show complex at Old Barn Garden Centre near Horsham. All Window Mart staff are employed by the company and drive fully equipped company vehicles. We have our own building team for groundwork and brickwork. In our showroom an extensive range of conservatories, doors and windows can be viewed. Excellence is our commitment and we are here to make sure you get the very best in service and quality.

Contact Us

01403 711 936

Show Complex

Old Barn Garden Centre,
Worthing Road, Dial Post,
Horsham, West Sussex,
RH13 8NR

Opening times:
Mon -Sat: 10am – 4pm
Sunday: 11.30am – 3.30pm

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