Wooden windows

B0C4145E-9A1C-4E80-9855-33EB3FC9E35C Created with sketchtool.
7BDF7E99-FF40-4125-9E4D-AD2D20F06698 Created with sketchtool.
7BDF7E99-FF40-4125-9E4D-AD2D20F06698 Created with sketchtool.


Quality where it counts

Accoya wooden window frames deliver all the beauty of natural wood with none of the downsides. That means minimal upkeep and maximum beauty.

From its superior insulation to its lasting good looks, Accoya timber window frames outperform other woods and uPVC in every way. Not to mention being better for the environment and healthier for you. Whether you’re looking for traditional wooden sash windows, stylish bay windows, practical casement windows or impressive architectural glazing – Accoya delivers on all fronts.


Our outstanding 50-year above ground warranty is here to give you complete confidence that your Accoya wooden windows will stand the test of time.

Low Maintenance

Low Maintenance

Accoya wooden window frames deliver all the beauty of natural wood with none of the downsides. That means minimal upkeep and maximum beauty.

Ideal for Coating


Accoya wooden windows have shown improved coating lifetime performance with many types of coatings, resulting in extended maintenance intervals.


Naturally insulating, you can lock in the warmth and lock down the price of your energy bills with Accoya windows. All while saving time, money and hassle on maintenance.

Accoya window performance

Accoya high performance windows out-perform traditional hardwoods and in many cases, uPVC and aluminum.

Key Benefit Accoya Sapele Oak Meranti Iroko Redwood
Lifespan ✓✓✓ ✓(✓) ✓(✓) ✓(✓) ✓✓
Warranty ✓✓✓ N/A N/A N/A N/A N/A
Coatings performance ✓✓✓ ✓✓
Thermally insulating ✓✓ ✓✓
Maintenance intervals ✓✓✓ ✓✓
Table shows comparison between properties of Accoya wood and other wood species. For more information, see the Accoya Performance Testing Summary on the downloads page.

Wood window styles

Accoya wood is very versatile - ideal for many different types of windows to suit any home.

Tested to the limit

Tested to the limit

60 year service life

After running tests and reviewing external and independent data, the BRE concluded that Accoya wood, provided best design practice is followed, has a service life expectancy of 60 years when used in exterior applications such as timber windows, wooden window frames and balconies.

Part Q compliancy

To enable building regulation Part Q compliancy, Accsys in collaboration with UKAS approved test houses of timber window and wooden door manufacturers, ancillary suppliers to our industry and the BWF Federation has developed a security global assessment. This document allows for the successful security testing of Accoya windows and doors to be cascaded down to window and door manufacturers, thus limiting the need for further testing.

Thermal Performance

Accoya thermal conductivity has been assessed by IFT Rossenheim, Germany in accordance with EN 12664 and then developed into the required declared value format, under the most rigorous European assessment methods by the EN ISO 10456: 2008 procedure for determination of declared and design thermal values.

In comparison to other standard wood types for joinery, Accoya thermal conductivity is:
› Superior to softwood by up to 8%
› Superior to hardwood by 30%

Please see more information in our download section.

Minnesota State Capitol

Case Study

Minnesota State Capitol

The majestic State Capitol building in St. Paul, Minnesota was in a state of deterioration: on the outside, the regal marble exterior design, completed in 1905, was crumbling.

The state embarked on a $272 million, four-phase restoration plan in 2013, with tasks including replacing plumbing and electrical systems, boosting energy efficiency, improving access, replacing the roof and repairing all of the crumbling stone.

Another major part of the project was restoring the building’s original wood windows, which had been covered over with aluminum windows 30 years ago with Accoya wooden windows.

Coatings & Finishes

A fully factory coating is strongly recommended for Accoya windows. A variety of colors and finishes have been tested by leading coating manufacturers with outstanding results. Some examples can be seen below but the possibilities are endless.

Accoya replaces rotten softwood

Case Study

Accoya replaces rotten softwood

The owners of the Chagford Old Rectory decided it was time to replace their windows and french doors. Over the years they have been repaired and maintained but the original windows, now over 130 years old, were unsalvageable. The original wooden windows were so severely weathered they had rotted beyond repair.

To retain the original aesthetic of the property but far improve the durability of the windows, the homeowners chose Accoya wood as the replacement material. Opting for wood allowed for a more authentic style which could be handcrafted. Some of the windows were unusual sizes, so custom windows were a necessity. Accoya wood was chosen for its durability, stability and sustainability, alongside its low maintenance properties.

Accoya window FAQs

Accoya is ideal for your windows

Read more in our blogs

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