Sliding sash windows for a home in Winchester.

Heritage Windows, Doors & Garden Rooms in Marlborough

Marlborough is famous for having one of the widest high streets in the UK, but living in such a historic market town comes with a responsibility to preserve its character. At KJM Group, we provide high-performance triple glazing and secure composite doors designed to respect the unique architecture of the town and surrounding villages.

Whether you need to replace draughty windows in a Ramsbury cottage with heritage flush sash, or you want a modern tiled garden room to enjoy views of the Savernake Forest, we offer the perfect balance of style and substance. Plus, with our No Pressure Promise, you get honest advice and a fair price without the hard sell.

LEARN MORE GET A QUOTE

Why Marlborough Chooses KJM Group

KJM Group has proudly served Marlborough and the beautiful surrounding Wiltshire villages since 1983. Marlborough is genuinely a unique market town where historic aesthetics truly matter. Furthermore, the strict Conservation Area securely located along the High Street, seamlessly combined with the eclectic mix of timber-framed and brick properties, explicitly means your windows need to be both visually perfect and incredibly durable.

Consequently, we heavily specialise in Timber Alternative systems that perfectly satisfy strict Wiltshire Council planners. Our premium products successfully offer the highly authentic look of traditional joinery—which is absolutely essential for actively maintaining property values in Marlborough—while simultaneously providing the formidable modern security and supreme thermal efficiency of 21st-century engineering.

★★★★★

Rated 4.9/5 by over 700 local customers

Which? Trusted Trader | Checkatrade Approved

Key Takeaways for Marlborough

Double & Triple Glazing: A-rated architectural glass for maximum thermal efficiency.
Composite Doors: Solid core, PAS 24 approved security for absolute peace of mind.
Planning Handled: We expertly manage all complex "material change" permissions for you.
Local Integrity: Honest advice and a strict No Pressure Promise.

Heritage Double Glazing: Timber Looks, Modern Tech

For the charming period cottages of Ramsbury or the grand Georgian facades lining Marlborough High Street, strictly maintaining the traditional "flush" sightline is absolutely non-negotiable. Therefore, we frequently install the market-leading Residence Collection (R9) and Deceuninck Flush Sash windows. These advanced systems flawlessly replicate 19th-century timber designs right down to the authentic mechanical joints, but they wonderfully never need painting.

Ultimately, this allows you to completely upgrade to modern double glazing without ruining the deeply loved character of your historic home. Unlike original timber which can inevitably warp and rot near the River Kennet, our timber-alternative ranges offer decades of flawless, low-maintenance performance. We proudly offer a choice of mechanical joints for that authentic handcrafted look, alongside a vast palette of period colours and stunning monkey-tail handles to perfectly complete the historic effect.

Timber-effect flush sash bay window suitable for Marlborough — Traditional styling for Wiltshire homes

Residence 7 Flush Casement conservation window — Residence 7 Flush Sash Design

See It In Person: The Roseview 'Ultimate Rose'

Seeing is genuinely believing. Many of our local Marlborough clients are initially highly sceptical about installing "plastic windows" in an older property. However, that changes the moment they visit our showroom and physically see the Roseview 'Ultimate Rose' sash window.

This remarkable, award-winning window is virtually indistinguishable from real timber. It exclusively features a remarkably slim mid-rail, highly authentic mechanical joinery, and a deep bottom rail that perfectly mimics original Victorian craftsmanship. Critically, it features "run-through" sash horns—which are integral to the frame structure rather than just stuck-on plastic caps—providing the seamless, high-quality finish strictly required for premium properties.

Beyond its striking appearance, the Ultimate Rose can be easily specified with thick acoustic glass to significantly reduce heavy traffic noise directly from the High Street (A4). This explicitly ensures your home is just as peacefully quiet as it is undeniably beautiful.

Roseview Ultimate Rose Sash Window in Showroom — The 'Ultimate Rose' Sash - Indistinguishable from timber.

Tiled Garden Rooms & Extensions

Many fantastic Marlborough properties currently benefit from beautiful garden views extending towards Savernake Forest or the scenic River Kennet. Unfortunately, older conservatories can simply be far too cold to enjoy them during the brutal winter months. Therefore, we heavily specialise in replacing freezing glass or noisy polycarbonate roofs with highly insulated Solid Tiled Conservatory Roofs.

A completely new tiled roof instantly creates a true "Garden Room" that genuinely feels like a permanent brick extension. It perfectly balances the ambient temperature year-round, completely removes the blinding glare of the summer sun, and drastically reduces heavy rain noise. Furthermore, we can seamlessly install stylish Velux windows to expertly maintain internal light levels.

Planning Permission Made Easy: Changing a translucent glass roof to solid tiles is officially classified as a "material change." Consequently, it usually requires formal Planning Permission and strict Building Regulations approval. While this administrative hurdle heavily deters many lazy installers, it does not deter us. KJM Group completely handles the entire complex application process for you.

Internal view of a tiled conservatory roof extension with vaulted ceiling — Inside: A beautiful vaulted ceiling creates a modern living space.

External view of a tiled conservatory roof extension matching the house tiles — Outside: We match the roof tiles to your home for a seamless finish.

Composite Doors: Matching Your Windows

A standard, cheap uPVC door can instantly ruin the delicate historic look of a period cottage. That is exactly why we proudly offer a vast, highly curated range of premium Composite Doors specifically designed to perfectly complement our bespoke heritage windows.

As you can clearly see from the architectural image, we can flawlessly match a flush Residence 9 window with a high-security composite door finished in the exact same heritage colour. Whether you choose a solid-core design in Chartwell Green, Painswick, or classic Black, you actively secure a cohesive look that massively enhances your home's kerb appeal. Crucially, all our doors come with complex multi-point locking systems as absolute standard.

Composite door installed next to a Residence 9 flush sash window — We can perfectly match your new door style to your heritage windows.

Aluminium: Slim, Strong & Modern

While Marlborough is obviously famous for its deep history, many younger homeowners are aggressively adding highly modern extensions to the rear of their properties to quickly create bright, open-plan kitchen diners. For these specific, contemporary spaces, Aluminium is undeniably the architectural material of choice.

We expertly install premium Aluminium Bi-Fold Doors and ultra-slimline windows that brilliantly maximise the natural light flooding directly into your home. The incredible, inherent strength of aluminium allows for vastly thinner frames and significantly larger panes of heavy glass. Ultimately, this gives you totally uninterrupted, sweeping views of your garden or the wider Wiltshire countryside. Available in highly contemporary Anthracite Grey or stark classic Black, they purposefully provide a stunning, bold contrast to traditional red brickwork.

Slimline aluminium bi-fold doors and windows on a modern extension — Maximise light and expansive garden views with slimline Aluminium.

Living in a Wiltshire Conservation Area?

Replacing exterior windows in historic towns inevitably involves highly specific planning rules. For detailed local guidance, we strongly recommend reviewing the official Wiltshire Council Conservation guidelines Wiltshire.gov.

Marlborough Home Improvement FAQs

In most cases, yes. Replacing a translucent glass roof with a highly insulated solid tiled one is officially considered a 'material change' to the property's appearance, which typically requires formal Planning Permission. It also requires Building Regulations approval regarding structural support and thermal insulation. KJM Group expertly manages this entire process for you, dealing directly with Wiltshire Council to ensure full, seamless compliance.

You can, but you must be incredibly careful with the architectural design. Standard, cheap uPVC is almost always instantly rejected. Consequently, we install highly specific heritage ranges (like the Residence Collection) that meticulously mimic traditional timber joinery so closely they are frequently approved by strict conservation officers. We can quickly advise you on what is highly likely to be accepted for your specific street.

Yes, absolutely. We comprehensively cover the entire SN8 postcode area and the wider beautiful Wiltshire countryside, including Ramsbury, Aldbourne, Pewsey, and Burbage. Ultimately, our surveyors are very familiar with the unique historic mix of thatch, brick, and flint architecture exclusively common in these villages.