Prices from:
£11,949
Our long-standing traditional Canadian design, The Rannoch is an A-frame apex roof design, square or rectangular in body, which sits proudly in any setting.
This was the very first design for our G&M Summerhouses which came to life in the 80s, which now lives on in our beloved Radiatas.
Ideal for year-round use, The Rannoch is your safe haven for work or play.
four-Layer Engineered Construction
Double-Glazed Aluminium Doors & Windows
Radiata heat-treated 50-year life cladding
Dreaming of a garden office, creative studio, or peaceful retreat – without the planning permission headaches?
Every Radiata Garden Room is designed to meet permitted development guidelines, so in most cases, you can skip the red tape and get straight to enjoying your new space.
(Just double-check location-specific rules like conservation areas or listed buildings)
Naturally beautiful and incredibly durable, Radiata ThermoWood is heat-treated to resist moisture, rot and decay – and comes with a 50-year lifepsan.
Its smooth, knot-free finish gives your Garden Room a sleek, modern look, while drastically reducing the need for timber maintenance. A premium external cladding choice that’s built to look fabulous for decades.
Superior Slimline Aluminium
Double Glazing
Strong, stylish, and built to last – our aluminium double-glazed windows and doors outperform standard uPVC in both durability and design.
The slimline frames let more natural light flood into your Garden Room, while still delivering top-tier thermal insulation. A perfect blend of modern aesthetics and year-round comfort.
Your Garden Room should feel just right, no matter the season.
With high-performance insulation in the walls, roof and floor, premium double glazing, and careful construction, our Radiata Garden Rooms are designed for year-round use – keeping you warm in winter and cool in summer.
Whether it’s your workspace, retreat, or creative studio, it’s a space you’ll love every day of the year.
The Rannoch is topped with steel box profile roofing – a durable, low-maintenance choice built to handle Scottish weather year after year.
Once properly installed, a steel roof needs little upkeep and holds its performance for decades, backed by our guarantee. It sheds rain and snow efficiently thanks to its ribbed profile, and resists the wear that timber or felt roofing can suffer over time. For buyers who want a classic, no-fuss finish without compromising on longevity, steel box profile is a proven, dependable option.
Every Radiata Garden Room comes fully delivered and installed as standard – no separate contractor to arrange, no added complexity.
Our team handles delivery within 40 miles of Errol as part of the price, with only a small charge for anything further afield. Once on-site, your building is assembled and finished, by our experienced team.
It's one less thing to organise during what can otherwise feel like a complicated project, and it means your Garden Room is put up properly, by people who build them every day.
The Radiata Garden Rooms do not come with Guttering as standard. We advise that all basework be constructed with a soakaway in mind to allow the water to run off the roof and be drawn away from the building.
It would be advisable for 10' x 10' & 12' x 10' sizes to opt for guttering given the amount of water they shed.
Radiata Garden Rooms are constructed with a 19mm thick tongue and groove subfloor. The subfloor is not advised to be used as the finished floor.
We offer laminate flooring as an optional extra, in three colours specially chosen to compliment the beautiful Radiata ThermoWood. If you'd prefer a different floor covering, you will need to arrange this yourself.
Find Out What Your Garden Room Really Costs – Start to Finish
We provide your chosen contractor with the specifications for your garden room's base. Once the base is completed and signed off, you’re ready for installation.
We purchased our bespoke garden room in June 2024. The quality and finish is just superb. Communication and service from start to finish from the G&M team was second to none.
We are so happy with our garden room, we bought in April this year, it is our little sanctuary where we can relax and chill out in peace. Gillies&Mackay have been brilliant the build work is professionally done, the electrical people they put you in touch with where also great. I would encourage everyone who were thinking of having a summerhouse to have a chat with Gillies & Mackay you won’t regret it, also the garden room is very versatile it can also be an office or spare room whatever you need it for, money well spent we feel. Thank you Gillies & Mackay!
Had a garden room built from G&M Aug 22. A really good experience and they made a fantastic job. Had 17 months enjoying the garden room. A couple of weeks ago I noticed the door had moved ever so slightly…..couple of cms. I phoned G&M looking for a wee bit of advice but got way better than that. Callum has been out and fixed the door. I can’t speak highly enough of this company, from the instillation to the wee fix 17 months later. And also Nicola who went above and beyond as well. Highly recommended.
Great Service, looking forward to enjoying the Scottish Summer in our Garden room 😁
Really good to see a local business doing such a good job.
Read our prep guide
Sheddies! You've probably got some questions about the prep work required to get ready for your new Radiata Garden Room.
We've got you covered – here's everything you need to get started.
Helpful Articles Visit Our Learning Centre
Not sure what you need to do to prepare the perfect foundation for your garden room? We’re here to help.
Why trawl through your local authority’s website when everything you need to know about how to navigate planning permission is right here?
