We’ve installed thousands of windows over the last 34 years, take a look at what we have installed more recently.
Fitting Scotland Perfectly
New Windows Castleton
Quality Energy Efficient Double Glazed Windows & Doors




A drop in temperature throughout the house. Rising bills. Condensation sitting on or inside the windows come morning. Sound familiar?
If that feels familiar, your windows are trying to tell you something.
As windows wear, they gradually lose their seal.
The gas between the panes gradually leaks, the rubber gaskets harden and shrink, and what used to held the cold out now barely holds it back.
In a city like Castleton, where rain and wind are frequently more regular than sunshine, tired windows have a noticeable impact on how warm and cosy your house feels.
Not to worry. The Advanced Group has over 38 years of trusted service. Single room or full house, replacement windows or doors, we’ll find the right solution and install everything correctly.

Certain issues are hard to miss. Cracked glass, rotten timber frames, handles that don’t close properly.
But other signs are harder to notice, and by the time you notice them, they’ve probably already been costing you money for months, perhaps even years.

Noticing moisture or fogging between your two panes of glass tells you the sealed unit has given up.
Once the seal goes, the argon gas that gives insulation leaks out, and the window loses a considerable chunk of its thermal performance.
Quit wasting money away on climbing heating costs. Restore your home’s thermal performance with well sealed new windows.

Place your hand near the edges of the window on a windy day. If you can feel cold air sneaking in, the seals have deteriorated.
Draught proofing strips might help temporarily, but they’re just a sticking plaster on a issue that’ll only deteriorate as the rubber keeps degrading.

A window that jams, won’t fasten right, or struggles to budge is more than an irritation. It’s a security risk and an insulation problem. Warped frames, worn hinges, and failed mechanisms are the window’s way of telling you it’s past its best.
Multi-point locking systems on newer windows offer much greater security than the single-point catches used in older windows, and toughened glass choices give an extra layer of security.

A considerable share of heat loss in any house comes from the windows. They represent the boundary between your indoor space and the outside weather.
Old double glazing doesn’t compete. The energy ratings are significantly below what’s on offer today, even if the original specification was good when first fitted.
New double glazed windows and doors will shield your property from high energy costs.

No two Castleton homes are the same, and the ideal window type depends on the house, the room, and how you use it.
The Advanced Group has a full selection of double glazed and triple glazed windows and doors on offer, including uPVC casement, sash, tilt and turn, and top hung types, all supplied and installed by our installers.

The casement window takes the crown of the UK’s most popular type. Side-hinged and opening outwards, they’re ideal for ventilation and a breeze to clean from inside.
Casement windows complement just about any property style, whether it’s a modern build or a traditional villa! They are offered in a big selection of colours and finishes, and the woodgrain effects mimic real timber without the maintenance or warping worries.

The sliding sash windows we install recreate the look of original wooden sash frames, while offering modern thermal performance and safety.
The proportions, sight lines, and opening mechanism all mirror the traditional style, which matters if your property is in a conservation area or you simply want to maintain its charm.

Tilt and turn windows tilt inward at the top for safe ventilation, and turn fully inward on a side hinge for simple cleaning.
They’re a well-liked choice for upper-floor flats where cleaning the outside of the glass from a ladder isn’t an option.
The tilt function is a proper plus! You get airflow without the security risks of a fully open window, which is especially handy if you’ve got young kids at home.
Top hung windows are hinged at the top and open outward from the bottom, offering a practical solution for ventilation that also helps to keep rain out.
You’ll often spot them in bathrooms, kitchens, stairwells, and bay window arrangements, rooms where both privacy and airflow are important.

French windows are full-length units that open outward in the same way as French doors.
Pair them up and match them with sidelights, and you can open up a wide opening with glass and natural light. The effect is stunning.

There are sound reasons why The Advanced Group specialises in uPVC frame materials.
uPVC frame materials are particularly well suited to the unforgiving Scottish weather, delivering durability and resistance to harsh, windy, and wet weather. Unlike timber frames, uPVC won’t have the same warping or rot concerns.
On top of that, uPVC is really low maintenance.
Wipe it down with soapy water. That’s it. Looks good as new.
Energy performance is where our uPVC windows really shine. Multi-chambered uPVC engineering, U-values as low as 0.8 W/m2K on some frames, and a proper boost to the energy performance of your home.
And best of all? uPVC double glazing is also the most cost-effective option.
This means you can often fit premium-grade glazing without blowing the budget. We also supply glazed uPVC doors, including uPVC doors, composite doors, and patio doors to match.
For a significant portion of the year, Scotland’s weather is cold, wet, and windy.
With that environment, your windows’ energy efficiency really affects your heating spend and how warm your house feels every day.
U-value. That’s the figure that reveals you how thermally efficient a window truly is.
The lower the figure, the less heat escapes through the glass and frame. Scottish building regulations currently demand a maximum U-value of 1.6 W/m2K for replacement windows.
Our standard double glazed windows achieve 1.2 W/m2K, and our premium models can hit 0.8 W/m2K! That’s performance at twice the regulatory minimum!
The result? It lands on your energy bills.
A-rated energy-efficient windows and doors, supplied with argon gas filled sealed units and low-E glass coatings, perform by bouncing heat back into the room while still allowing to let light through.
Switching from old single-glazed sash windows or 1990s double glazing? You could see a significant drop in heating bills within the first winter.
While many double glazing companies in Castleton offer entry-level products, few can compare with the calibre of the windows and doors we install.

Our trusted installers are often asked about the triple glazing options we carry.
With an extra pane of glass, triple glazing offers improved insulation and improved noise reduction.
Exposed area? Up a hill? Facing north? Near a busy road or flight path? The Advanced Group will guide you through the advantages of triple glazing.

We understand that new windows are a notable investment, and paying for them in full all at once isn’t always practical.
So we provide 0% APR and up to 4 years of interest free credit. Simple.
Get the windows you deserve. Spread the cost in a way that suits for you.
Over 38 Years in the Industry
Since 1988, we have been installing double glazing throughout Scotland.
Over the course of 38 years, we have discovered what lasts best, built lasting relationships with partners, and trained window fitters who take genuine pride in their work. That experience is reflected in every job we complete.
15-Year Guarantee as Standard
15-year guarantee on every installation. Product and workmanship covered.
Our guarantee lands above the competition. Why? Full assurance in the standard of our windows and the expertise of our installers.
If anything happens, just contact us and we’ll fix it right.

As Scotland’s premier supplier of energy-efficient double glazing products, we have an unrivalled selection of designs, frames, colours, and finishes.
Pop into our showroom and we’ll be more than pleased to personally talk you through our range.

Planning new windows or doors in your Castleton house? The Advanced Group is here to help.
Whatever your window and door plans are, we’ll arrange a home survey at a time that works for you, get the measurements, talk through your choices, and give a written quote with no obligation and no pressure.
Prefer to see our selection in person before committing? Our showroom door is open, come in any time.
To book your free quote or home survey, please contact a member of our friendly team today.
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