The technical detail, in one place.
Pineapple Windows sells and surveys premium uPVC sash windows made by Victorian Sliders in Carmarthenshire, for period homes across south-west London. Here's the full specification, and how to fit for us.
Sash windows made in Wales
We fit vertical sliding sash windows made by Victorian Sliders, a specialist PVC-U sash window manufacturer. Every window is made to measure for your opening at their factory in Carmarthenshire.
They're designed for period homes, from Victorian and Edwardian terraces to 1930s semis, as a lower-maintenance alternative to replacing timber like-for-like.
The things that make it look like timber
Cheap uPVC sashes give themselves away at the joints and the rails. These are the details that don't.
Timber-look joints
Joint lines that mirror a joiner's work: vertical on the sash, horizontal on the frame, hand-assembled with an aluminium cleat system.
Run-through sash horns
The little projections below the upper sash that every original Victorian window has. Included as standard.
Deep bottom rail
A taller bottom rail with a mortise-and-tenon look, closer to traditional timber proportions.
90 mm deep vs 60 mm standardSlim midrail
A slimmer meeting rail where the two sashes meet, so more glass and less plastic.
Georgian & astragal bars
Glazing bars to match your house, from two-over-two to six-over-six and anything in between.
Your proportions
Standard 50/50 sashes or custom splits to match originals, plus splay and square bays, arched and shaped frames.
50/50 · 60/40 · 70/30Specification
What comes as standard and what we can upgrade to.
| Item | Specification |
|---|---|
| Thermal | 1.3 W/m²K U-value, A+ energy rating Standard |
| Glass | Toughened glass, sealed units tested to BS EN 1279-6 Standard |
| Security | Tested to PAS 24:2022 enhanced security and BS 6375-3 |
| Secured by Design | Police-preferred security specification Upgrade |
| Approved Document Q | Security for new dwellings and extensions Upgrade |
| Weather & durability | BS 6375-1 performance and BS 6375-2 durability |
| Warranty | 10-year manufacturer warranty, plus a written guarantee on our installation work |
- Tilt-in sashes for cleaning
- Security locks
- Sash lifts
- Pole eyes
- Travel restrictors
- Trickle vents
- Hardware in a choice of finishes
See the product and the factory
Videos published by Victorian Sliders on YouTube.
Closed-loop by design
The factory runs its own recycling plant, reprocessing offcuts and old PVC-U frames from partners.
Recycled PVC-U is used for the thermal reinforcing inside the sashes.
PVC-U can be recycled up to 10 times, so the material outlasts the window.
Fit for Pineapple
We win and survey the work; you fit it. We're looking for FENSA or CERTASS registered installers who already know sash windows, to take pre-sold jobs across Balham, Clapham, Battersea, Wandsworth, Tooting and Streatham.