Timber specialists for over 170 years
Structural timber, decking, flooring, cladding, joinery and building materials — milled to your specification and delivered on time, all the time.
Everything from foundation to finish
A one-stop shop for trade and home builders. If it's timber, we stock it, mill it or can source it.
Construction & Building Timber
A major stockist of structural timber and engineered wood products.
Timber Decking & Handrails
Framing, fixings, decking, stair treads, handrails, posts, oils and stains.
Timber Flooring
Timeless, durable floors that add value to your investment.
Cladding & Panelling
Weatherboards and panelling milled to your spec, plus Weathertex and Hardies ranges.
Joinery & Mouldings
Custom skirtings, architraves, treads, sills and door frames in any species.
Treated Timber & Landscaping
A massive range of treated timber to protect against termites and decay.
Accoya® Approved Manufacturer
Ultra-durable, stable and sustainable. We supply Accoya and mill it into cladding, decking, joinery, windows and doors to your specification.
Architectural timber, screening & pre-oiled ranges
Premium ASTUTE architectural timbers such as Accoya, Yakisugi and Burmese Teak. Hardwood screening battens and ready-made screen panels. Decking, cladding and screening supplied pre-oiled with CUTEK® or Intergrain® and ready to install.
Helping you get the job done
From a single length of moulding to a complete house kit, our team handles estimating, milling, priming and delivery — so you can focus on the build.
What we offer
- Full estimates incl. frame & truss fabrication and bill of quantities
- Kits & package deals — frames, trusses, roofing, gyprock, cladding, flooring
- Specialised sawing & milling to any detail
- On-site priming
- Our own delivery fleet, plus delivery Australia-wide
- Export & import for off-shore projects
- Credit accounts for approved customers
Six generations of building
Harper Timber began in 1854 as Coates & Harper, sawmillers and timber merchants in Granville. From the banks of the Parramatta River to Pendle Hill and now our yard at Thornton, we've supplied the timber behind generations of homes.
Visit us
Thornton (Mill)
23 Glenwood Drive, Thornton NSW 2322
| Monday – Thursday | 7:00am – 4:00pm |
| Friday | 7:00am – 11:00am |
Mona Vale (Timber & Hardware Sales)
75 Bassett Street, Mona Vale NSW 2103
| Monday – Friday | 7:00am – 5:30pm |
Got a plan or a cutting list?
Send it through and we'll come back with a price.