Woodfellas are the timber window specialists working out of Bonhill. We manufacture, refurbish, and install wooden windows from our Bonhill workshop, serving both residential properties and commercial properties right across Central Scotland.
Each window is custom-built using ethically sourced treated pine or hardwood timber. Double glazing and upgraded security are fitted as standard on every unit.
Sash and case for a tenement? Casements for a contemporary extension? A complete new set for any property? We produce them all in-house and install ourselves.
What timber windows we offer
We manufacture two main types of timber window, each designed for different properties and needs. Both are offered in treated pine or hardwood, and both feature double-glazed sealed units as standard.
Sash and case windows
The traditional Scottish window, and it hasn’t changed.
Sash windows slide vertically within a timber box frame, via a system of weighted cords and pulleys. They represent the standard window type on most of Bonhill’s period tenements, and they’re the only accepted replacement for listed buildings and conservation area properties where sash and case was the original design.
We restore, fix, and make custom sash windows built to match period profiles and proportions. The outcome is modern thermal and acoustic performance in a window that looks exactly as it should.
Restoration often covers draught-proofing and double glazing upgrades. Best call where existing frames are in good condition. We assess everything before recommending any replacement.

Casement window types
Casement windows are the hinged type: they open out to open, which gives you a bigger opening for fresh air and means you can clean them from inside from inside. They’re standard on Bonhill properties built from the 1920s on, and they’re the usual choice for extensions, dormers, and newer builds.
We produce custom timber casement windows in side hung, top hung, and fixed styles. Just like our sash windows, every casement is custom-built and fitted with double glazing as standard, no exceptions.
Our timber casement windows page covers all listed options and configurations in complete detail.
Wood windows, why they’re the right choice
Timber windows have been around for centuries, and there’s a good reason they’ve stayed the first choice. It’s not just tradition, timber truly outperforms UPVC and aluminium in a number of areas that count to homeowners.
Natural insulation
Here’s something that surprises people: timber actually conducts heat far less easily than aluminium, and it outperforms UPVC at the comparable frame width. That means the frame itself is already doing stronger thermal work before you even factor in the double glazing.
Scotland’s not exactly warm, and heating bills are no joke, so the fact that timber frames keep heat in better makes a real difference to what you pay.
Timber windows, repair before replace
Timber window gets damaged? You can sort it.
Rot in a sill or bottom rail? Take it out, splice in new timber. Damaged frame part? Rebuild it. UPVC isn’t repairable: it breaks, it ends up in landfill, you start again.
Over a property’s lifetime: repair and maintain, not replace. Cuts money. Reduces waste.
Sustainability
We source all our timber from ethically managed woodland, so you can be sure it’s responsibly produced.
Timber: renewable. Stores carbon. Decomposes cleanly. UPVC: plastic from oil. Aluminium production: highly carbon-heavy.
Your property’s environmental footprint is important? Then timber is the clear option. It always has been.
Beauty and value
The heft, character, and grain of timber windows is something no synthetic alternative can copy.
On a traditional sandstone tenement, a pale stone villa, or a period Scottish cottage, timber windows fit right in a way UPVC never quite manages. Worth considering if aesthetics count to you.
Timber windows also contribute tangible value to a property, particularly older properties where period features are part of the appeal.
Double glazed wooden windows
Sash or casement, it doesn’t matter. Every window that leaves our workshop has double-glazed sealed units fitted as standard. Always has.
The sealed unit is housed within the timber frame, using two panes of glass separated by a sealed cavity to reduce heat transfer and improve sound insulation.
The timber frame’s natural thermal properties combined with the double-glazed sealed unit deliver excellent thermal and acoustic performance across both window styles. That’s what you get as standard.
We can also fit glazing bars if your property calls for a traditional divided-light look.
Older frames. Single glazing only. Still in good shape? We can often upgrade to double glazing as part of a restoration programme. Original frames are preserved. Performance improves. No full replacement.
This is a regular project on Bonhill’s older properties, where solidly built original sash windows perform structurally well but single glazing admits cold air and road noise.
Building regulations for thermal standards? Every unit we fit complies with them. No exceptions.

Conservation area timber windows
Over 600 conservation areas throughout Scotland. The odds are yours is one of them.
Property in a conservation area? UPVC: not acceptable. Council will likely require replacements mirroring the original. Material, design, profile.
Having manufactured timber windows for conservation area and listed building properties across Scotland for over 20 years, we have a strong understanding of council requirements.
We can advise on consent conditions and produce windows that satisfy every planning condition while still giving you modern performance. Our sash and case windows page covers the regulations in more depth if you want to read up.
Timber types
We stock two timber types across all window range, here’s what you need to know about each.
Treated pine represents the most frequently chosen option. It is pressure-treated to resist rot and decay, holds a paint finish readily, and performs reliably in Bonhill’s damp climate.
If you prefer a natural timber look, or if you need something more durable, hardwood is the answer, it’s inherently more immune to deterioration and it accepts stains and oils really well.
We recommend the right timber for each project, based on the property, its exposure level, and the finish you need. Just let us know and we’ll guide you.
Timber windows FAQ
What types of timber windows do you make?
We make sash and case windows and casement windows, both offered in treated pine or hardwood. Sash and case are the traditional Bonhill design, moving vertically within a timber box frame. Casement windows hinge and swing out. We also build fixed window panels for any window opening setup.
Is timber better than UPVC?
Yes, for results, longevity, and looks, timber is better. It insulates more effectively at the same frame thickness, lasts significantly longer when looked after, and can be repaired rather than replaced. It’s also the sole material accepted for listed buildings and is highly preferred in conservation areas.
Can existing timber windows be upgraded to double glazing?
In most cases, yes. If your current timber frames are in solid condition, we can upgrade the glazing to double-glazed sealed units as part of a restoration. That retains the existing frames and character while lifting thermal and acoustic performance.
Get a free quote for timber windows in Bonhill
Whether your requirement is a single window repair or a complete property of custom timber windows, please contact us on 07920 057592 or complete the form on our contact page and we will get back to you within 24 hours.
Custom timber doors. Bi-fold doors. Timber shop fronts. Throughout Bonhill and Central Scotland.