Upvc Boat Windows

Upvc Caravan Windows

Painted Upvc Windows

About Us

BuyWindowsOnline.co.uk have been supplying slimline windows and doors since 2011.

We offer a supply only and install service nationwide. Our products suit themselves to the DIY markets due to the ease of install and the support - advice that we give to assist 

Before & After

Upgrade your boat with our slimline double glazed boat windows.

Benefits - no condensation  no maintenance  thermal efficient  choice of any colour  easy to install  noise reduction 

Boat Windows

Our Slimline Marine Boat Windows have reduced sight lines and a back to front depth of 48mm, perfectly suited to accommodate narrower wall construction found in Canal Boats & Barges 

The slim-line odd leg section sits on the external face of the building, giving a coverage of 19mm on all sides. A non-drying beading sealant is used around the external overlap, which when compressed during installation stage, becomes watertight and fills in any gaps within the external cladding giving a clean finish.

The window comes factory glazed with externally toughened security glass on double sided security tape. This means that the glass can only be changed with access to the inside for added security.

Boat Window - Measuring & Installation


Always measure from inside. 

Remove any internal trim around the window to reveal the existing window. Simply measure the existing window. If the existing window is a very tight fit, reduce the overall size by 5mm to allow for easy installation. Do not worry if you have rounded corners, these can easily squared off using a hand held oscillating saw. The corners do not need to be 'professionally squared' as the external overlap of the upvc window frame will cover the corners and therefore will not be seen.


The windows can be two ways dependent on the finish you require.

1) Aluminium Fixing Kit: Installed by knocking an aluminium fixing bar into the specially designed window, giving a secure clamp fix finish. The fixing bar then doubles up as an internal trim which sits flush to the inner wall. This is suitable for wall construction of 38mm or 53mm. The fixing kit cost and additional £25 for this window. Please contact us with any questions.

2) Screw Fix: If your wall construction differs than the above wall thickness, or you'd prefer to trim the internal surround of the window with the existing timber or an new timber beading then you can fix them using screw fix through the depth of the window frame into the timber subframe of the window. Simply open the vent and screw through the frame

You will need to seal the odd leg frame (external lip) with non drying sealant silicone. As the boat is constantly moving, if you use standard silicone, it will crack and leak over time.

Boat Doors

Our boat doors come with the following benefits:

multi point locking system ✅ toughened security double glazed glass ✅ adjustable hinges ✅ no condensation ✅ no maintenance ✅ thermally efficient ✅ choice of any colour with our painted service ✅