Most garages around here hold a lawnmower, some paint tins and a car that never goes in. We turn them into warm, dry rooms that feel like part of the house.
A garage already has walls, a roof and foundations. That makes it one of the quickest ways to add a room, without building out into the garden.
We're a local team based in Pontrug, just outside Caernarfon. We convert garages across Gwynedd and Anglesey, and we do the building, insulation and plastering ourselves. Gwynedd Construction Ltd has been building in North Wales as a limited company since 2016.
A quiet, warm room away from the kitchen table. For anyone working from home a few days a week, it's often the change that makes the biggest difference.
We put the sockets, lighting and window where your desk will go, so the room works from the day you move in.
One garage can become two rooms: a home office at the front and a utility room or garden room at the back, for example.
A new stud wall splits the space, and each room gets its own door, light and heat. We can also keep a smaller store at the front if you still need one.
Have room in the garden as well? A house extension can add even more space.
What the work involves
More than a stud wall where the door was
A garage was built to keep a car dry, not people warm. These are the jobs that turn it into a proper room.
The floor
Most garage floors sit lower than the house. We lay a damp-proof membrane, insulate and raise the floor to meet the rest of the house.
The door opening
We build a new wall on proper footings, with a window or French doors if you want the light.
Walls and ceiling
Insulated to today's standards, then boarded and plastered.
Heat, light and power
Radiators or electric heating, sockets and lighting where you need them.
Air and fire safety
Ventilation, and a safe way out in a fire if the room is a bedroom.
The finish
Plastering, skirting, doors and decoration, ready to move in.
Planning in Wales
Do you need planning permission?
Usually not, if the garage is attached to the house and most of the work is inside. But check these two things first:
Has your house lost its permitted development rights? Newer estates often have a planning condition that keeps the garage as a garage. If so, you need a planning application.
Is your house in a conservation area or Eryri National Park? Changes to the front of the house may need permission.
Rules change, so treat this as a guide. We check your house before you commit.
Building Regulations
You will almost always need Building Regulations approval, because the garage becomes a room people live in. That covers insulation, ventilation, fire safety and the new wall's foundations. We build to those inspections as standard.
A quick building job
A garage conversion is one of the quicker building jobs, and most of the work happens without disturbing the rest of the house.
Turning it into a holiday let?
Since 1 September 2024, Gwynedd Council needs planning permission before a main home becomes a second home or short-term holiday let. Eryri National Park brought in the same rule on 1 June 2025. The same applies if a converted garage becomes a separate holiday let.
Reviews
Don't take our word for it
Real words from real customers in Gwynedd, Bangor and Anglesey.
“Once the decision to FINALLY get a new kitchen was made the nerves set in. There was no need, Gavin and his team made everything right. Communication was excellent … And best of all done within timescale agreed. Very Happy.”
★★★★★
Office repairs · Google
“I’ve used Gwynedd Construction on several occasions for general repairs in my office, and every time the service has been exceptional. Gavin, the owner, is professional, reliable, and clearly takes pride in the work his team delivers. … Highly recommended if you’re looking for quality workmanship in North Wales.”
★★★★★
Garage conversion
“Can't speak highly enough of Gwynedd Construction Ltd. They completed the work on time and to an extremely high standard. Nothing was too much trouble … Will definitely use them again.”
★★★★★
Building project · Google
“I must commend the excellent high-quality construction work that was delivered. … The planning phase was executed to perfection … the team's ability to effectively manage unexpected changes truly stood out. … 100% recommend.”
★★★★★
Bedroom work · Google
“Gwynedd Construction did an excellent job on the work i had done on my bedroom. They were very professional and polite. They cleaned up afterwards and you wouldn't have known they had done work on my bedroom.”
★★★★★
Walls removed, 3 RSJs fitted
“Gavin and Geraint were extremely professional from our very first meeting. They are two hard working, trustworthy, reliable and extremely tidy workmen. … Can't recommend them highly enough.”
★★★★★
Renovation project · Google
“Can't speak highly enough of Gwynedd Construction and the incredible work they did on our one-year renovation project. … What impressed us most was their ability to handle unexpected challenges with ease, offering creative solutions while staying on schedule and within budget.”
★★★★★
Extension, garage & patio · Google
“The team built a large extension at the back of my property and a detached garage … I then had the team back to do a patio and a retaining wall. Also very clean and tidy workers … Good job Gavin and gang.”
★★★★★
New kitchen & wall removal
“We are extremely pleased with the work that has been completed. … Everything was kept safely and out of the way at the end of the day. They all worked very efficiently to a very high standard.”
★★★★★
Builder · Google
“A true craftsman, a master of his trade. A man of integrity and reliability always prompt and courteous. … I’d highly recommend this exceptional builder and his skilled team.”
★★★★★
Extension · Google
“Gwynedd Construction provides excellent, quality professional service, project managed my extension, very impressive, on time and within budget, as well as offering innovative design advice along the way, highly recommended.”
★★★★★
New patio · Facebook
“Hogia clên ac taclus iawn ei gwaith. Glanhau bob nos cyn gadael ac yn hollol ddi-drafferth. Awgrymu’r cwmni’n gryf!”“Friendly lads, very tidy work. They cleaned up every night before they left, and it was completely hassle-free. Highly recommend the company!”
★★★★★
Building work · Google
“It was a pleasure to welcome this friendly professional and trustworthy crew every morning. Never let me down, in fact went out of their way to find solutions to unforeseen issues.”
★★★★★
New kitchen · Google
“Once the decision to FINALLY get a new kitchen was made the nerves set in. There was no need, Gavin and his team made everything right. Communication was excellent … And best of all done within timescale agreed. Very Happy.”
★★★★★
Office repairs · Google
“I’ve used Gwynedd Construction on several occasions for general repairs in my office, and every time the service has been exceptional. Gavin, the owner, is professional, reliable, and clearly takes pride in the work his team delivers. … Highly recommended if you’re looking for quality workmanship in North Wales.”
★★★★★
Garage conversion
“Can't speak highly enough of Gwynedd Construction Ltd. They completed the work on time and to an extremely high standard. Nothing was too much trouble … Will definitely use them again.”
★★★★★
Building project · Google
“I must commend the excellent high-quality construction work that was delivered. … The planning phase was executed to perfection … the team's ability to effectively manage unexpected changes truly stood out. … 100% recommend.”
★★★★★
Bedroom work · Google
“Gwynedd Construction did an excellent job on the work i had done on my bedroom. They were very professional and polite. They cleaned up afterwards and you wouldn't have known they had done work on my bedroom.”
★★★★★
Walls removed, 3 RSJs fitted
“Gavin and Geraint were extremely professional from our very first meeting. They are two hard working, trustworthy, reliable and extremely tidy workmen. … Can't recommend them highly enough.”
★★★★★
Renovation project · Google
“Can't speak highly enough of Gwynedd Construction and the incredible work they did on our one-year renovation project. … What impressed us most was their ability to handle unexpected challenges with ease, offering creative solutions while staying on schedule and within budget.”
★★★★★
Extension, garage & patio · Google
“The team built a large extension at the back of my property and a detached garage … I then had the team back to do a patio and a retaining wall. Also very clean and tidy workers … Good job Gavin and gang.”
★★★★★
New kitchen & wall removal
“We are extremely pleased with the work that has been completed. … Everything was kept safely and out of the way at the end of the day. They all worked very efficiently to a very high standard.”
★★★★★
Builder · Google
“A true craftsman, a master of his trade. A man of integrity and reliability always prompt and courteous. … I’d highly recommend this exceptional builder and his skilled team.”
★★★★★
Extension · Google
“Gwynedd Construction provides excellent, quality professional service, project managed my extension, very impressive, on time and within budget, as well as offering innovative design advice along the way, highly recommended.”
★★★★★
New patio · Facebook
“Hogia clên ac taclus iawn ei gwaith. Glanhau bob nos cyn gadael ac yn hollol ddi-drafferth. Awgrymu’r cwmni’n gryf!”“Friendly lads, very tidy work. They cleaned up every night before they left, and it was completely hassle-free. Highly recommend the company!”
★★★★★
Building work · Google
“It was a pleasure to welcome this friendly professional and trustworthy crew every morning. Never let me down, in fact went out of their way to find solutions to unforeseen issues.”
Why us
Why people pick Gwynedd Construction
A local builder you can reach on the phone, who turns up when they say and leaves the job tidy.
5.0★★★★★on Google
01
Local to Gwynedd
Based in Pontrug, just outside Caernarfon, with more than 15 years in construction.
02
An established company
Gwynedd Construction has been a limited company since 2016.
03
5.0 stars on Google
And 100% of people who reviewed us on Facebook recommend us.
04
One team, start to finish
From the groundwork to the plastering, so you're not passed between firms.
05
On time and tidy
The site is kept clean as we go, and you're kept up to date the whole way.
Based in PontrugJust outside Caernarfon, Gwynedd
Areas covered
Where we convert garages
We convert garages across Gwynedd and Anglesey. Not on the list? Give us a ring and ask.
Do I need planning permission for a garage conversion?
Usually not, if the garage is attached and the work is mostly inside. See the planning section above, or ask us when we visit.
Will the room be warm enough to sleep in?
Yes. Insulating the floor, walls and ceiling properly is the whole point. Done right, it is as warm as any other room in the house.
Do I need a new window?
If the room will be a bedroom or office, you'll want daylight. Most people replace the garage door with a window or French doors.
Do you give free quotes?
Yes. Call 07825 205657 or send the form below, and we'll arrange a free estimate.
Does a garage conversion need sprinklers?
Not if the garage becomes part of your house. In Wales, sprinklers are needed when building work creates a new, separate home, so a self-contained annexe may need them. We check this with building control.
Other work we do
More from the same team
The same local crew can take on the rest of the house and garden too.
