Guide to Garage Conversions
- Glenn Thompson

- 9 hours ago
- 4 min read
Converting your garage into usable accommodation is one of the smartest home improvements you can make. Whether you want an additional bedroom, gym, home office, or a peaceful garden room retreat, a garage conversion will add value and functionality to your home.
But how do you get started?
What should you expect?
And how do you avoid the common pitfalls?
Let me walk you through the garage conversion process, step by step.
Why Consider a Garage Conversion?
A Guide to Garage Conversions.
To begin with, why consider converting your garage? Garages frequently become cluttered and dusty, preventing the parking of a car. Rather than allowing that space to be wasted, why not turn it into something far more beneficial for you?
Here are some benefits:
Cost-effective: More affordable than constructing a new extension.
Adds value: A well-executed conversion enhances your property's market value.
Saves garden space: No need to encroach on your garden for additional space.
Flexible use: Whether it's a gym, studio, or extra bedroom, the possibilities are endless.
Of course, it’s not just about slapping on some paint and calling it a day. You need to plan carefully, when our weather, planning and building regulations play a major role.

Planning Your Garage Conversion
Before picking up the hammer and nails, it's crucial to plan. Keep in mind that a garage often resembles a simple walled shed, suitable for parking a car. Transforming it into a cozy and inviting living area requires considering natural light, as well as adding insulation and heating.
Check Your Garage’s Suitability
Not every garage is a good candidate for conversion. Ask yourself:
What’s the best way to insulate the floor, walls and roof?
Is there enough natural light or will you need to add windows?
What will you do with the existing garage door?
Understand Planning and Building Regulations
In this guide to garage conversions you will require planning permission and building control approval.
It’s always wise to consult with a professional or your local council to avoid surprises. GT Building Design offers expert professional advice and will help you navigate the legal maze efficiently and smoothly.
Budgeting and Timeline
Allow for the following:
Architectural Fee: A written fee proposal will be provided.
Structural Engineers Fee: Should structural alterations / calculations be required.
Planning and Building Control Application Fees: Payable to your local council.
Builders Fees: Including insulation / heating, electrical and plumbing work
Decorating and Furnishings: To make the new space your own.
GT Building Design will guide you through the process, step-by-step. From preparing the existing drawings, design proposals based on your wish-list and obtaining approvals. GT Building Design will provide you with a stress free garage conversion!
Expect the design / approval process to take around 4 months and then you can appoint a builder and commence work on site.
Designing Your Dream Space
Now comes the fun part! Deciding what your new room(s) will look like. Here are some tips to get the design right:
Maximise Natural Light
Garages often have small or no windows. Adding windows or roof lights will make a huge difference. Natural light will make the space feel bigger and much more welcoming.
Insulation and Heating
Northern Ireland’s weather can be chilly, so proper insulation is a must to reduce heating costs. Walls, floors, and ceilings should be well insulated to keep the room(s) warm and energy-efficient. Consider new underfloor heating or extend your existing central heating system.
Flooring Choices
Concrete floors are common in garages but not ideal for living spaces.
Optional floor finishes may include:
Laminate or Solid Wood
Carpet
Tiles
Choose a floor finish that meets your lifestyle and suitable for your new space.
Storage Solutions
Don’t forget storage! Built-in shelves or cupboards can keep the space tidy and functional.
Electrical and Plumbing Needs
Will your new room need extra sockets, lighting, or plumbing? For example, a home office might need multiple power points, while a guest bedroom would benefit from having an ensuite.

Finding the Right Professionals
Reach out to GT Building Design! I will guide you through the process with expert designs, also obtaining your approvals from both Planning and Building Control.
Unless you’re a DIY wizard, you’ll want to engage with a reputable builder and perhaps an interior designer if you want flair with the finishing touches.
Choosing local professionals is a smart move as we know the ins and outs of the process and will help you avoid costly mistakes.
If you want a hassle-free experience, contact GT Building Design for your garage conversion. With 40 years experience in Architecture I specialise in helping homeowners transform their spaces!

What to Expect During Construction
Once the design process and approvals are secured, construction can begin and here’s a summary of what will be next:
Clear out the garage: Remove everything stored inside.
Structural work: If floor is being renewed and new windows or roof lights installed.
Installing insulation: To make the space warm and comfortable.
Electrical and plumbing: Wiring and pipes go in.
Plastering: Walls and ceilings finished.
Painting and Decorating: Time to add your flair and make the space your own.
Furnishings: Bring in your furniture and introduce your own personal style.
During this period, anticipate some noise and dust. It's advisable to arrange for alternative parking if you typically use the garage for your car. You might also consider a new garden shed for storing the lawn mower and other items.
Making the Most of Your New Space
After all the hard work, it’s time to enjoy!
Here are some ideas to make it truly yours:
Keep the space organised with clever storage.
Add cosy rugs and cushions for comfort.
Use smart lighting to create different moods.
Incorporate plants for a fresh feel.
Remember, a garage conversion is not just about adding space - it’s about enhancing your home and lifestyle!
If you're considering converting your garage, it's crucial to seek professional guidance early in the process. With proper planning and design, you can transform your garage into something remarkable. ❤️
Your dream space is just a conversion away!
Ready to start your project?
Reach out to GT Building Design today.




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