double-glazedinsulatedpremium-hardwarescandinaviantilt-and-turnweatherproofyear-round

Premium Window GW-4

Premium 878×1981mm tilt-and-turn timber window with 68mm laminated pine profile and 4+16+4 LowE glazing. U-value 1.1, MACO hardware, for garden buildings.

Key specifications

Overall size: 878 × 1981 mm
68mm finger-jointed laminated pine profile
4+16+4 LowE ESG+Argon double glazing
U-value 1.1 thermal performance
MACO tilt-and-turn hardware

Precision-Engineered Tilt-and-Turn Timber Window

The GW-4 is a premium timber window engineered for professional-grade garden buildings, log cabins, and timber structures. Constructed from a 68mm finger-jointed and laminated pine profile, it delivers outstanding dimensional stability and long-term weather resistance in demanding outdoor environments.

High-Performance Glazing and Thermal Efficiency

The GW-4 features double-glazing with a 4+16+4mm LowE ESG+Argon configuration, achieving a U-value of 1.1. This thermal performance makes it suitable for well-insulated seasonal and year-round structures alike. The thermal rain protection rail GTR 22.44 K provides additional protection against wind-driven rain ingress.

Quality Hardware and Sealing

The tilt-and-turn mechanism is sourced from MACO — a trusted European hardware brand — offering both inward tilt ventilation and full inward turn for easy cleaning and emergency egress. Rubber draught excluders on all sides ensure effective wind and water resistance, while the spruce casing with rubber sealants and a black metal sill protect the timber frame from moisture and long-term wear.

Delivered ready for installation as a complete unit, the GW-4 is compatible with Dadsons’ full range of log cabin wall thicknesses and timber building systems. A tolerance of ±3mm applies to all stated dimensions.

Specifications

Width

87.8 cm

Height

198.1 cm

Applications

Garden Retreat & Outdoor Living

Enhance your lifestyle by extending your living area into nature. Create a serene sanctuary for relaxation, reading, or yoga with our garden structures. Our durable timber decking, pergolas, and summer houses transform your garden into a functional outdoor living room. Experience the tranquility of natural wood and create a dedicated space for leisure and family enjoyment.

Guest Accommodation & Hospitality

Expand your living space and welcome visitors in style with high-quality guest accommodation. From cozy backyard cabins for family visits to premium holiday rental units for Airbnb, we provide the essential foundation. Our complete wooden houses offer turnkey convenience, while our structural timber ensures robust frameworks for custom hospitality projects and extensions.

Home Office & Creative Studio

Create the perfect productive environment just steps from your home. Whether you need a distraction-free home office, an inspiring art studio, or a craft workshop, our solutions offer the ideal space. Choose from our range of ready-made garden buildings or utilize our premium timber materials to construct a bespoke workspace designed for year-round comfort and professional focus.

Wellness & Sauna

Embrace the health benefits of authentic Nordic wellness right in your own backyard. Our timber products are at the heart of the traditional sauna experience. We offer complete barrel sauna kits for immediate relaxation, as well as specialized thermo-treated wood and cladding for building custom spa facilities. Create a personal wellness retreat that rejuvenates both body and mind.

Windows, Doors & Architectural Joinery

Upgrade your property with high-performance operational elements. Our range of premium and standard windows and doors offers excellent thermal efficiency and aesthetic appeal for both new builds and renovations. Beyond the units themselves, we supply the specialized timber components needed for architectural joinery, allowing for custom fitting, frame construction, and the creation of unique entrances that make a lasting first impression.

Why choose Premium Window GW-4?

Premium 68mm Laminated Pine Profile

The finger-jointed and laminated pine construction ensures superior dimensional stability compared to solid timber, minimising warping and shrinkage over time. The 68mm profile depth provides excellent structural rigidity and thermal mass for high-performance timber buildings.

High-Efficiency Double Glazing

The 4+16+4mm LowE ESG+Argon glazing unit achieves a U-value of 1.1, significantly reducing heat loss through the window. Low-emissivity glass combined with an argon gas fill makes this unit suitable for both seasonal garden buildings and year-round insulated structures.

MACO Tilt-and-Turn Mechanism

Fitted with hardware from MACO — a leading European window fittings brand — the GW-4 opens both inward on a tilt for ventilation and fully inward on a turn for cleaning and egress. This dual-mode functionality provides flexibility and ease of use for end customers.

Comprehensive Weather Sealing

Rubber draught excluders on all sides, combined with a thermal rain protection rail (GTR 22.44 K) and a black metal sill, provide robust protection against wind, rain, and moisture ingress. The spruce casing with rubber sealants further extends the service life of the frame and surrounding timber structure.

Frequently Asked Questions

The GW-4 has an overall frame size of 878mm wide by 1981mm tall. The glazed opening measures 618mm wide by 1631mm tall. A manufacturing tolerance of ±3mm applies to all dimensions.

The GW-4 achieves a U-value of 1.1 through its 4+16+4mm LowE ESG+Argon double-glazing unit. This makes it suitable for well-insulated garden buildings intended for regular or year-round use.

The MACO tilt-and-turn hardware allows the window to open in two ways: tilting inward from the top for controlled ventilation, or turning fully inward on a vertical axis for cleaning, maintenance, or emergency exit. Both functions are operated from a single handle.

The GW-4 is designed for use with Dadsons’ timber building systems. Please contact us to confirm compatibility with your specific wall profile and thickness, as the casing design accommodates various log wall configurations.

The GW-4 includes a thermal rain protection rail GTR 22.44 K, rubber draught excluders for wind and water resistance, a black metal sill to protect the timber casing from moisture, and a spruce casing with rubber sealants. Together these features ensure reliable long-term performance in exposed outdoor conditions.

Laminated pine windows should be inspected annually and re-treated with a suitable exterior wood stain or paint system as needed to protect against UV degradation and moisture. The rubber seals should be checked periodically and replaced if they show signs of cracking or compression set.

Quality Materials Inside

Sawn Timber: Pine and Spruce for Construction

Discover our high-quality sawn timber from pine and spruce, ideal for construction with natural moisture, eco-friendly properties, and versatile sizing options.

Glued (Laminated) Wooden Beams and Boards

Discover glued wooden beams and boards made from pine and spruce, offering high moisture resistance, load capacity, and splinter-free handling for furniture, stairs, and windows.

Solid Glued (Laminated) Spruce Panels

High-quality solid glued panels made from premium spruce, available in various thicknesses, lengths, and widths, with hand-planed and sorted finishes for superior quality.

BS 2482:2009 Certified Scaffold Boards

Compliant with BS 2482:2009, our scaffolding boards feature metal plate clamping and come in multiple sizes for versatile construction applications.

Sawn Timber: Pine and Spruce for Construction

Discover our high-quality sawn timber from pine and spruce, ideal for construction with natural moisture, eco-friendly properties, and versatile sizing options.

Glued (Laminated) Wooden Beams and Boards

Discover glued wooden beams and boards made from pine and spruce, offering high moisture resistance, load capacity, and splinter-free handling for furniture, stairs, and windows.

Solid Glued (Laminated) Spruce Panels

High-quality solid glued panels made from premium spruce, available in various thicknesses, lengths, and widths, with hand-planed and sorted finishes for superior quality.

BS 2482:2009 Certified Scaffold Boards

Compliant with BS 2482:2009, our scaffolding boards feature metal plate clamping and come in multiple sizes for versatile construction applications.

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Two-panel sliding door with aluminium frame, 4mm tempered glass, and spruce casing. Precision-engineered for timber garden buildings. Request a trade quote.

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Solid spruce double door with 45mm profile, double glazing, and adjustable hinges. 1416 x 1863mm overall frame. Outward opening with weather seals.

Standard Double Door SDD-2

Classic spruce double door (1416 x 2043 mm) designed for garden houses. Features solid timber frame, double-glazing compatibility, and durable hardware.

Single Window Model SW-1

Premium wooden single window (886 x 1271 mm) for 44mm garden buildings. Features double glazing, weather strips, and Nordic spruce frame. Hardware included.

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Double Window SDW-3

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Single Door SD-2

Solid spruce single door with 45mm profile, laminated anti-warp construction, rubber draught seals, and adjustable hinges. Engineered for timber garden buildings.