Click here to submit your enquiry and one of our team will reach out!
Adding a WC or shower room turns a garden room into something far more useful — a genuine guest space, a treatment room, or a gym you can shower in. It also introduces drainage and water supply, which is what decides whether it is straightforward or complicated on your particular site.














A team of qualified tradesmen specialising in insulated garden rooms, working across Northern Ireland and the Republic.
We aim to have our insulated garden buildings completed within 3-5 days to minimise disruption for you.
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
Everything hinges on how far the room sits from an existing foul drain and whether it can fall to it. Where gravity drainage is possible the work is relatively simple. Where it is not, a pumped solution is required, which adds cost and needs power. We establish this at survey before quoting, not after.
A cold feed is run from the house in an insulated, protected duct at the correct depth to avoid freezing. Hot water is normally provided locally with an electric water heater rather than running a hot feed the length of the garden, which loses heat and costs more to install.
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.
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.
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.
Sit back and enjoy your new low-maintenance, year-round space, backed by our 10-Year aftercare warranty for complete peace of mind.
Once you introduce drainage and sanitary fittings, building control becomes relevant and requirements differ between Northern Ireland and the Republic. Planning may also be affected depending on floor area and position. We tell you what your local authority is likely to expect before you commit.
EXCELLENT
Based on 137 reviews
Posted on Google![]()
Stephen LovettTrustindex verifies that the original source of the review is Google.
Great service from start to finish. Highly recommendPosted on Google![]()
Gordon ElliottTrustindex verifies that the original source of the review is Google.
CG Joinery were an absolute pleasure to deal with. They were extremely professional with superb office and onsite teams. The CG Joinery product is excellent and as a company they are agile in meeting the clients needs and wants. 5 star rating without a shadow of a doubt.Posted on Google![]()
Eamon DynesTrustindex verifies that the original source of the review is Google.
Just want to say thanks to one of your lorry drivers. I didn't manage to get his name. I got stuck in a hedge this morning (just outside of Banbridge) and your driver along with a few other lads, got me hooked up and towed me out of the hedge. I am extremely grateful to him. I just want to say thanks again, if you could pass this on to your drivers. Thanks.Posted on Google![]()
Mary McCabeTrustindex verifies that the original source of the review is Google.
We are very happy with our garden room supplied by CG Joinery, All workmen arrived on the date that they had said they would. We got everything we asked for. Would recommend CG Joinery to anybody looking for a nice outdoor room,Posted on Google![]()
Tara MchughTrustindex verifies that the original source of the review is Google.
We recently had a garden room built by CG Garden Rooms and I honestly couldn't recommend them highly enough. From the first conversation right through to completion, the communication was excellent. Every question was answered quickly, timelines were clear, and the whole team was an absolute pleasure to deal with. Nothing was ever a problem. One thing that really stood out was that all materials had to be brought through our house to access the garden. I was quite concerned about this beforehand, but the team took such care and made the entire process completely seamless. They were respectful, tidy, organised and treated our home as if it were their own. The quality of workmanship is outstanding. The attention to detail, finish and overall build quality exceeded our expectations. It's clear that pride is taken in every aspect of the work. What can sometimes be a stressful project was made easy from start to finish thanks to a professional, hardworking and genuinely friendly team. We're absolutely delighted with the finished garden room and have already had so many compliments on it. If you're considering a garden room, I would have no hesitation in recommending CG Garden Rooms. Thanks again to all the team for such a fantastic job. Tara McHughPosted on Google![]()
Ryan OneillTrustindex verifies that the original source of the review is Google.
Absolutely fantastic experience from start to finish! We recently had a garden room, shed, and hot tub room built by CG Joinery and couldn’t be happier with the results. The whole process was incredibly smooth — the team completed everything quickly without any fuss or delays, which was a huge relief. What really stood out was the service. Conaill, Michael and Sarah we dealt with was friendly, professional, and genuinely helpful at every stage. They kept us informed, answered all our questions patiently, and clearly took pride in their work. You could tell they cared about getting every detail right. The finished garden room looks brilliant and has already become one of our favourite spaces. The shed is solid, practical, and exactly what we needed for storage, while the hot tub room is a real standout — beautifully finished and the perfect place to relax. Highly recommended if you’re looking for quality workmanship delivered with real care and efficiency. We wouldn’t hesitate to use them again!Posted on Google![]()
Johanne SmithTrustindex verifies that the original source of the review is Google.
We couldn’t be happier with our new garden room from CG Joinery. From the very first meeting right through to completion, the entire team has been fantastic to deal with. Their workmanship, attention to detail and professionalism have been outstanding. Nothing was ever too much trouble. The quality of the finish has exceeded our expectations, and it’s clear they take enormous pride in their work. The team were punctual, friendly, hardworking and left everything clean and tidy. It’s rare to find a company that delivers exactly what they promise, but CG Joinery certainly did. If you’re thinking of adding a garden room to your home, I wouldn’t hesitate to recommend CG Joinery. A first-class company delivering a first-class product. Thank you to everyone involved—we absolutely love our new space!Posted on Google![]()
Tadgh McCauleyTrustindex verifies that the original source of the review is Google.
Top class work by the CG Joinery. No problem in building the garden room to my specific requirements. Highly recommendPosted on Google![]()
Jane MullaneTrustindex verifies that the original source of the review is Google.
I cannot speak highly enough about the CG Joinery team. Everyone from the office to the guys who come and build are a pleasure to deal with and go above and beyond to advise and support. You won’t go wrong with them and you’ll have a gorgeous room at the end!
A WC and basin take less space than most people assume, but they have to be planned from the start rather than squeezed in later. In a compact room we usually place the cloakroom against the wall nearest the drain run, which keeps pipework short and the main space usable.
Wet areas are tanked and tiled properly, using the porcelain tiles we supply. Ventilation is essential — extraction plus adequate airflow, otherwise moisture will find its way into the structure. This is the detail cheap builds skip and it is the one that causes damage.
With a shower room, a garden room works as genuine guest accommodation rather than a spare sofa. Insulation and heating matter more here because guests will be there overnight, and storage needs planning so the room does not feel temporary.
A shower makes a garden gym far more practical. For therapists and beauticians a basin is often a professional requirement rather than a convenience. Both are achievable — the question is always drainage, which we assess first.
Walls, floor and roof are insulated as standard, with glazing to match. In a room containing water services this matters twice over: for comfort, and because a cold, poorly ventilated room with plumbing is where condensation problems begin.
Drainage, water supply, the sanitary fittings, tanking and extraction all add to the figure, and a pumped drainage solution adds more than a gravity run. We itemise it in the quotation so you can see exactly what the bathroom element costs and decide accordingly.
Tell us where the room would sit relative to your house and existing drains, and we will assess feasibility at survey and quote in writing. We are at 7 Ryan Rd, Mayobridge, Newry BT34 2HZ, covering Northern Ireland and Ireland. Call (NI) 07702 909637 or (ROI) 089 277 2494.
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.
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.
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.
Not if it is built correctly. Wet areas are tanked and tiled, with mechanical extraction and adequate ventilation. Skipping ventilation is what causes moisture problems in garden buildings with plumbing.
€1500 off all garden rooms if you book in July. Don't miss out!