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CG Garden Rooms

Insulated Garden Rooms

Garden Rooms Built for Every Season

Insulation is the single thing that decides whether a garden room is a usable room or an expensive shed. Ours are insulated in the walls, floor and roof, with glazing and heating specified to match, so the space holds temperature through an Irish winter rather than only working in summer.

Reliable & Qualified Experts

A team of qualified tradesmen specialising in insulated garden rooms, working across Northern Ireland and the Republic.

Quick Turnaround

We aim to have our insulated garden buildings completed within 3-5 days to minimise disruption for you.

Competitive & Flexible Prices

Confirm your booking with a deposit, make a part-payment on day one of installation, then settle the balance on completion day.
*Finance options now available

Where Insulation Actually Matters

Heat escapes through the floor and roof as readily as the walls, and a building insulated in the walls alone will still be cold underfoot and slow to warm. Cold bridging at junctions and around openings undoes good intentions, which is why the detailing matters as much as the depth of insulation.

Glazing and Heat Loss

Large glazing transforms a room and is also where most heat is lost, so the two have to be balanced. We specify glazing appropriate to the amount of glass and the orientation, and discuss it openly at survey rather than fitting the cheapest unit and leaving you with the running costs.

How It Works

01

Discover

Explore our range of bespoke garden rooms and get in touch via phone, email, or social media to discuss your ideas. You’re also welcome to visit our Garden Room Showroom just outside Newry to experience the quality of our work first-hand.

02

Design & Book

We provide a free, no-obligation quote and help you choose the ideal size, layout, and finish to suit your space and lifestyle. Once agreed, your booking is secured with a 10% deposit, followed by 50% on day one of installation and 40% on completion. Finance options available.

03

Build & Install

Your fully insulated garden room is built on site from start to finish, with most installations completed within 3–5 days, depending on your specifications.

04

Enjoy

Sit back and enjoy your new low-maintenance, year-round space, backed by our 10-Year aftercare warranty for complete peace of mind.

Heating Options

A well-insulated room needs very little heating. Electric panel heaters, infrared and air conditioning units that also heat are all practical. What matters is that the room warms quickly in the morning instead of needing to run continuously — which only happens if the insulation is right first.

EXCELLENT
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Based on 97 reviews
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Owen O B profile picture
Owen O B
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We had a garden room built by CG Garden Room in May. Very happy with how it turned out. Arrived exactly when they said they would and built it to our exact requirements. The whole job was finished in 4 days. Very professional and nice people to deal with.
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deborah Carr profile picture
deborah Carr
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We recently had a garden room built, and I can honestly say the whole experience was a pleasure from start to finish. The team were friendly and easy to have around from day one - polite , respectful, they turned up when they said they would each day, got straight on with the job, and worked efficiently until completed. The finish was precise, tidy and solid, it was clear they do things properly and don't cut corners. We are absolutely delighted with the result and wouldn't hesitate to recommend Conaill and his team to anyone looking for a room built by reliable, hardworking guys who know their trade and take pride in their work.
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Toni Hollowell profile picture
Toni Hollowell
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From start to finish the lads at CG Joinery were excellent to deal with! They were really helpful in discussing options, sizes, plans and models of the garden room over the phone and via Teams calls. They responded quickly to queries and made it an easy decision to travel from Galway to Newry to visit the showroom before the final design was agreed. The garden room was installed last week, after a long but very worthwhile wait - no delays, we were told when ordering it would be December, just in time for Christmas. The install team were amazing. Professional, tidy, courteous and trojan workers! Our 35m2 room was up and finished within 28hrs - built, floored, plastered with lights and heat working! They arrived at 7.30am one day and had completed the build and cleaned up by 10.30am the following day. We are more than happy with the result and feel the quality, workmanship and speed in completing the build was worth every penny. We would highly recommend CG Joinery if you're considering them.
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Hollie profile picture
Hollie
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I was lucky enough to win a competition on Instagram for a garden room with CG Joinery. It was honestly the most emotional experience I’ve ever had as this was something I have dreamt of putting in my back garden since we bought and renovated our house in March ‘23. We put a lot of money towards the win to extend our garden room and I worried this would cause hassle. Instead, it was the smoothest process ever! Conaill was always a phone call away over the months or back and fourth planning. Sarah was always at the end of every email and responded instantly. The men that came to built our dream garden room were so lovely, so easy to host and so lovely to chat about to. Every single person on the team takes their roll very seriously and you could see and hear that while they worked. They were at our door at 7:15 am and did not finish up until 7pm that night. The following day they had a 7:30 start time and the job was complete by 9:30am. I could not get over how quick they had it complete. It went to show that experience from highly skilled workers pays off. I will continue to recommend CG Joinery as in today’s world, it is very easy to get people who are looking for the money but don’t want to do the job. It makes it very hard to trust anyone anymore. But CG Joinery are whole heartedly involved and encouraging to do every job right and to the best standard! HIGHLY HIGHLY RECOMMEND! Hollie Dunlea.
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Valbona M profile picture
Valbona M
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Absolutely delighted with our garden room from Garden Rooms by CG Joinery. The quality of workmanship is excellent, the team were professional and reliable, and the whole process was smooth from start to finish. The garden room looks fantastic and has exceeded our expectations. Highly recommended. We wouldn’t hesitate to recommend Garden Rooms by CG Joinery to anyone considering a garden room — outstanding quality and a fantastic service from start to finish.
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Ben Gilmore profile picture
Ben Gilmore
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Just had my garden room and shed finished and we are over the moon, brilliant having it up and ready for Christmas 😅🎄 top class service, thank you very much!
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Sharon Owens profile picture
Sharon Owens
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Fantastic from start to finish great group of lads especially ethan.Hard workers v polite.would highly recommend great workmanship high quality finish inside and outside. Delighted with my garden room.
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Keith Richardson profile picture
Keith Richardson
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Great service. There's a wait time but the room was built very quickly and to high quality. Way more economical when compared to an extension. The design your own room tool is also fab.
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Jonathan D'Arcy profile picture
Jonathan D'Arcy
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CJ joinery is one of the most professional companies I’ve ever dealt with, the team are super professional, have great work ethic and deliver the best standards. We got a garden room and shed combo and from start to finish the experience was amazing. Would recommend to anyone in Ireland!

Insulated Rooms in Smaller Gardens

A smaller footprint does not mean lower specification. Compact rooms are actually easier to keep warm, and we insulate them to the same standard. Slimmer depths and corner placements keep a small garden feeling open.

Condensation and Ventilation

Insulation without ventilation causes condensation, and condensation is what ruins garden buildings. We detail for airflow as well as heat retention, which is the difference between a room that stays dry and one that develops damp in its second winter.

Made to Measure, Insulated Throughout

Every room is drawn around your garden, and the insulation specification is consistent regardless of size or shape. Complex plots need more careful detailing at junctions, not less insulation.

Insulated Garden Offices

For office use insulation does two jobs: it holds heat and it reduces noise. Rain on a poorly built roof makes calls impossible. We specify acoustic performance alongside thermal performance so the room is genuinely workable through a full day.

Cladding and the Building Envelope

Composite cladding is low maintenance and stable in wet, exposed conditions, which suits coastal and rural sites. Timber needs periodic treatment. Either way the cladding is the outer layer of a properly built envelope, not a decorative skin over a thin structure.

Comparing Quotes on Insulation

Two quotes that look similar can be very different buildings. Ask any supplier what insulation is used in the floor, walls and roof, what the glazing specification is, and whether electrics are included. Those four answers explain almost every price difference you will see.

Get an Insulated Garden Room Quotation

Tell us how you intend to use the room and we will survey the site and issue a written fixed quotation with the insulation and glazing specification stated. We are at 7 Ryan Rd, Mayobridge, Newry BT34 2HZ, covering Northern Ireland and Ireland. Call (NI) 07702 909637 or (ROI) 089 277 2494.

Finance Options Available​

We’re dedicated to making high-quality garden rooms accessible to everyone. With flexible financing options, you can explore ways to fund your garden room project without stretching your budget. Our team can guide you through the process with a simple, no-obligation soft credit check.

Visit Our Showroom​

To see the quality and variety of our garden rooms, we invite you to visit our showroom. Here, you can explore the range of finishes, layouts, and materials in person and get inspiration for your project. Our team will be on hand to answer any questions and provide guidance based on your preferences.

Transform Your Outdoor Space​

With CG Garden Rooms, you’re not just getting an extra room, you’re investing in a versatile, beautiful space that enhances your lifestyle. Whether it’s for work, relaxation, fitness, or creativity, our garden rooms are custom-built to enrich your home and create value for years to come.

Frequently Asked Questions

Yes. With insulation in the walls, floor and roof plus appropriate glazing, the room holds temperature and warms quickly. That is the whole purpose of building it this way rather than as a summerhouse.

Yes. A wall-only build stays cold underfoot and is slow to warm, so we insulate the floor and roof to the same standard and detail the junctions to avoid cold bridging.
Not if it is ventilated as well as insulated. We detail for airflow at the same time as heat retention, so the room stays dry through winter.

Very little. Electric panel heaters, infrared or a heating and cooling unit all work well. In a properly insulated room the heating warms the space quickly rather than running all day to keep up with heat loss.

Need more info?

Give us a call to discuss what you have in mind. We would be glad to help, and we can provide a competitive quote for the work.

€1500 off all garden rooms if you book in July. Don't miss out!