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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 97 reviews
Posted on Google![]()
Owen O BTrustindex verifies that the original source of the review is Google.
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.Posted on Google![]()
deborah CarrTrustindex verifies that the original source of the review is Google.
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.Posted on Google![]()
Toni HollowellTrustindex verifies that the original source of the review is Google.
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.Posted on Google![]()
HollieTrustindex verifies that the original source of the review is Google.
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.Posted on Google![]()
Valbona MTrustindex verifies that the original source of the review is Google.
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.Posted on Google![]()
Ben GilmoreTrustindex verifies that the original source of the review is Google.
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!Posted on Google![]()
Sharon OwensTrustindex verifies that the original source of the review is Google.
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.Posted on Google![]()
Keith RichardsonTrustindex verifies that the original source of the review is Google.
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.Posted on Google![]()
Jonathan D'ArcyTrustindex verifies that the original source of the review is Google.
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!
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!