Premium Windows
& Doors for
Rathgar Homes
Your neighbourhood window and door company — with a showroom right here on Rathgar Avenue. We fit across Rathgar, Rathmines, Ranelagh, Terenure, and all of South Dublin. Straight-talking advice, honest pricing, and work we stand behind.
10,000+ Customers
Trusted across Dublin
10-Year Warranty
On every installation
ISO 9001:2015
Certified quality standards
SEAI Grants Available
We'll guide you through it
35% Off
Limited time offer
Why Rathgar Homeowners Choose Thermoglaze?
If you need new windows and doors in Rathgar, you don’t have to look far. Our showroom is right here on Rathgar Avenue, in the middle of the neighbourhood we serve every day.
Rathgar, Rathmines, Ranelagh, Terenure, Harold’s Cross — these streets are full of period homes built between the 1880s and 1930s. The architecture is stunning, but the original windows rarely are by the time they’re 100 years old. Timber rots, putty cracks, sash cords snap, and single glazing does almost nothing to keep the cold out.
That’s where we come in. We’ve spent years working on homes exactly like these, and we know how to replace old windows without ruining the character that makes your house special.
OUR PRODUCTS
Windows & doors for every Rathgar property
From the red-brick Victorians along Rathgar Road and Highfield Road to the Edwardian terraces off Orwell Road — we’ve been fitting windows and doors in homes just like yours for years. Period homes need care and experience, and that’s what we bring to every job.
uPVC Windows
Low-maintenance, high-performance frames that keep heat in and noise out. A straight swap for old timber or early uPVC windows.
View rangeAluminium Windows
Slim frames, big glass areas, and a clean modern look. Ideal for extensions, new builds, and contemporary renovations.
View rangeAlu-Clad Windows
Timber on the inside for warmth, aluminium on the outside for weather protection. No painting, no sanding - just years of trouble-free performance.
View rangeComposite Front Doors
Good-looking, tough, and secure. Dozens of colours and panel styles to choose from. They don’t warp, fade, or rot.
View rangeBi-Fold & Patio Doors
Open up the back of your house to the garden. Wide openings, floor-to-ceiling glass, and proper weather seals when they’re closed.
View rangeFrench & Lift-Slide Doors
Classic double doors or smooth-sliding glass panels. Both options give you full-height views and solid insulation.
View rangeHow New Windows and Doors Save You Money in Rathgar
Old single-glazed windows can account for up to 30% of heat loss in a period home. That means nearly a third of the energy you’re paying for is going straight out through the glass and frames
Our A-rated replacement windows fix that problem completely. With triple glazing, warm-edge spacer bars, and argon gas fills, they keep warmth in during winter and stop rooms overheating in summer. You’ll notice your home feels more comfortable straight away — and your energy bills will reflect the change too.
For homes on busy roads like Rathgar Road or Rathmines Road, the noise reduction is another major benefit. Triple glazing cuts outside noise significantly, which makes a real difference when you’re trying to sleep or work from home.
Front Doors, Patio Doors and More for Rathgar Homes
Your front door is the first thing visitors see, and in a neighbourhood like Rathgar, it matters. We supply composite front doors in traditional and contemporary styles — from solid panel designs that suit a Victorian terrace to glazed options that bring light into a dark hallway.
For the back of the house, French doors and patio doors are the most popular choices in this area. If you’re extending into the garden or adding a sunroom, our bi-fold and lift-and-slide doors give you floor-to-ceiling glass and a wide opening that makes the space feel twice as big.
Why Thermoglaze Rathgar
Local Knowledge.
European Quality.
Rathgar is full of beautiful old houses — but beautiful doesn’t always mean warm. Many of the Victorian and Edwardian homes here still have their original single-glazed timber sash windows. They look the part, but they let in draughts, rattle in the wind, and push up your heating costs.
We get it — you don’t want to rip out a period feature and stick in something that looks like it belongs on a housing estate. That’s exactly why we carry vertical slider windows and timber-effect alu-clad frames that keep the look of your home intact while giving you modern insulation, security, and silence.
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✓
Windows and doors built for coastal living
Our aluminium and alu-clad frames are designed to resist salt corrosion, moisture, and strong coastal winds, making them the ideal choice for homes throughout Clontarf and along Dublin Bay.
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A-rated energy efficiency and outstanding noise reduction
Triple-glazed, A-rated windows keep your home warmer, reduce heating costs, and significantly minimise wind and traffic noise, creating a quieter and more comfortable living space.
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Pay monthly with humm finance
Investing in premium coastal-grade windows and doors is more affordable with humm finance. Spread the cost into convenient monthly payments and protect your home without delaying your project.
across Dublin
every installation
on all products
stocks last
How It Works
From First Call to Finished Fit
Three steps. One local team. No hidden costs — and we're a phone call away whenever you need us.
Get a Free Quote
Ring us on 01 912 0600, fill in our online form, or walk into our Swords showroom.
Home Survey
We come out, measure everything properly, and go through the options with you face to face. No guesswork, no pressure.
Professional Fitting
Our own fitters do the work — no subcontractors. We leave the place clean and hand you a 10-year warranty.
You Could Qualify for Government Funding
You Could Qualify for Government Funding The SEAI Better Energy Homes scheme pays a portion of the cost when you upgrade to A-rated windows and doors. We’ll tell you straight away whether your home is likely to qualify and help you pick the right products.
Our brands
European manufacturers.
Thermoglaze expertise.
Every brand we carry has been chosen because it performs well in Irish weather conditions and meets the quality standards our customers expect.
Service Area
Serving Rathgar and Surrounding Areas
Our Rathgar Avenue showroom sits right in the heart of South Dublin. We fit windows and doors in all of these areas and can usually schedule a home visit within a few days of your call.
Common Questions
Before you visit
Most answers are below - or call 01 912 0600 and we'll answer in minutes.