Olsen Doors and Windows Logo



Phone Olsen

Visit marker Visit

Phone 0844 826 7766

  • Timber doors and windows

    Welcome to Olsen Doors & Windows

  • Bespoke timber doors and windows

    Welcome to Olsen Doors & Windows

  • Aluminium clad timber sliding doors

    Welcome to Olsen Doors & Windows

  • Bifolding doors from a trusted suplier

    Welcome to Olsen Doors & Windows

Thermo 80

Thermo 80
Thermo 80 timber window


Engineered (laminated) timber profiles

Pine or Oak timber frames

Factory applied paint or stain finish

Tilt & turn, tilt only or turn only - all inward opening

Siegenia Titan AF opening mechanisms

Circumferential fittings with micro-ventilation and anti-burgular catch

Factory fitted double or triple glazing

Internally beaded by secret nailing

Overall U-value of approx. 1.2W/m2K (double glazed) or from 0.9W/m2K (triple)

Shaped opening windows possible

Aluminium clad version available (Thermo 80 Alu)

Competitive price

10 year guarantee*

Thermo 80 is a range of timber, inward opening tilt & turn windows designed with a classic, 80mm deep, frame profile. With multiple functions available, the Thermo 80 range is a very popular choice on many projects for domestic, commercial and residential use. Enhanced security options make this range able to comply with Secured By Design specifications and also has many optional accessories for safety, security and comfort at a very competitive price.



Send enquiry



Thermo 80 windows are inward opening casements with a tilt & turn function. Several key types and functions are available:

• Fixed window

• Tilt & turn - sash tilts with the first 90o turn of the handle, a full 180o turn allows the sash to turn inwards

• Turn & tilt- first 90o turn of handle allows the window to turn inwards, a full 180o turn gives a tilt function

• Tilt only- bottom hung inward tilting window for ventilation • Tilt & turn balcony door - same function as tilt & turn window but with a deeper bottom rail. Available with handle inside only.

• Turn only balcony door - inward or outward opening door with deeper bottom rail than that of a window. Available with handles inside & out.


Opening lights and fixed lights can be built in one frame with endless design possibilities.

More info...


Thermo 80 products can be supplied double or triple glazed. As standard the units are double glazed 4-16-4mm (4mm pane of glass, 16mm gas cavity and a second 4mm pane of glass). The glass unit is filled with Argon as standard and has a soft, low-e coating giving a centre pane U-value of 1.1W/m2K (overall window U-value of 1.2W/m2K).

Triple glazed units are 4-14-4-14-4mm (4mm pane of glass, 14mm gas cavity, 4mm pane of glass, 14mm gas cavity, 4mm pane of glass) with a center pane U-value of 0.6W/m2K (overall window U-value of 0.9W/m2K).


SAA key locking Hoppe handles

Trickle vents to the outer frame = trimvent

Trickle vents to head of sash = spilvent

Opening restrictors (child safety catch)

Protective foil to glazed units for protection

Hau-Tau lever fittings for high level windows.


All timber is finished with a choice of stains or paints. Paint choices are from the RAL Classic range (approx. 250 colours). All paints and stains that are used are water based, micro-porous products from Akzo-Nobel. Actual timber samples are sent out upon receipt of order to help assist in the correct colour choice for your project.

Commercial Projects

Olsen doors and windows