We use a variety of sustainably sourced timbers, here are some of our favourites.


All our external doors are manufactured in accoya to reduce the risk of seasonal movement. It can also be used for our casement and sliding sash windows. Accoya can be painted or stained.

Accoya brings unprecedented reliability for timber; trusted not to visibly swell, shrink or distort, with minimal movement. Highly durable, it withstands the test of any climate.

Accoya is a sustainable choice that helps meet global challenges like climate change.  Accredited by the FSC®and Cradle to Cradle Gold certified™

For more benefits of using Accoya, download the brochure here.

Red Grandis

Red Grandis is GK’s preferred hardwood for casements, windows, and door frames.

*Engineered for strength and stability
*Sustainable Ethically sourced 100% FSC® certified

Red Grandis is a wood that varies in colour from pink to white, cream to light rose; however, its claim to fame likely belongs to the fact that it is certifiably green. It is the trademarked name for hardwood from a plantation-grown Eucalyptus tree (Eucalyptus grandis) that boasts FSC certification.



Sapele is a timber originating from tropical Africa. A tight interlocking grain with a dark red colour that resembles mahogany. Recommended use for cills and thresholds.



lroko has a medium to coarse texture, with open pores and an interlocked grain. The wood is tough, dense, and very durable. It is often used as a substitute for teakfor it’s resemblance in both colour (light brown to deep golden-brown) and grain. Commonly used for gates.


European Oak

Aside from the obvious physical advantages, appearance is one of the major reasons oak is so desirable as a building material. It naturally possesses a pleasing golden colour that dries to a pleasant silvery tone when untreated. We use oak for doors, windows, staircases and other internal joinery. When used externally coatings will need regular maintenance intervals.

European Oak


In general ash is a light-coloured wood, with sapwood varying from white to yellow and heartwood light to dark brown, sometimes with lighter streaks. Ash wood is generally straight-grained with a coarse uniform texture. No two pieces are ever the same in appearance. Ash is not for exterior use.


Tulipwood (poplar)

Colour ranges from white to pale olive green or brownlt is straight-grained, of even texture and grain and relatively strong. It’s main uses are in furniture, doors, panelling, architectural interior joinery and mouldings, and kitchen cabinets.The timber is typically painted. Julipwood is not for exterior use.


Redwood (softwood)

Redwood is a pine often referred to as Scots Pine. The sapwood is creamy-white to yellow in colour. We traditionally use redwood for skirtings, mouldings and stair componenis. We advise against using redwood externally.


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