Heritage Window Units

Westcountry Heritage Units are super slim, sealed glass units, that offer a modern solution to an old problem, providing excellent performance without compromising a buildings appearance.

westcountry heritage logo

These super slim units provide excellent performance without
compromising on appearance and are the ideal solution for Heritage, Period and listed properties.

Produced to order with an authentic appearance, slim sightlines
and narrow unit cavities, Westcountry Heritage Insulated Glass Units will
compliment listed properties and historic buildings with restoration
and replication requirements.

Sympathetically providing the benefits of double glazing to older
properties without compromising a buildings aesthetics these units
are produced at our Plymouth location and to each clients
exact requirements for supply only or supply and installation.

Heat loss comparison

The diagram above shows how much heat is lost through windows and doors in a modern day property. The red areas show prior to standard double glazing being installed. The right hand image shows the drastically lower levels of heat loss. Heritage and Period building will experience similar heat loss and installation of our Heritage Units expertly fitted in traditional, crafted wooden frames can have similar impact on heat loss.

We can recommend a joiner near you who will be able to assist with the frames, while we can supply and install the made to measure Westcountry Heritage glass units.

All our Heritage units are available with Black or White Spacer bars.

Spacer bars are an integral part of our Heritage units. They separate the two panes of glass and because we use Warm Edge spacer bars, condensation is virtually eliminated. All our Heritage units are available with Black or White Spacer bars.

The table below shows the some of the variations available within our Heritage units.

Heat loss from buildings is measured by U value and is expressed in W/mk2k.

The lower the U value the  better the  insulation provided by the relevant material.

For comparison, the U value for a typical pane of single glazing is 5.8W(m2k)

Westcountry Heritage Options Air Filled 90% Argon Gas Filled 90% Krypton Gas Filled
4mm Clear/ 4mm Cavity/ 4mm Clear Ug 3.6W/(m2,k) Ug 3.3W/(m2,k) Ug 3.0W/(m2,k)
4mm Clear/ 4mm Cavity/ 4mm Pilkington K Ug 3.2W/(m2,k) Ug 2.7W/(m2,k) Ug 2.0W/(m2,k)
4mm Clear/ 4mm Cavity/ 4mm Planitherm Total Ug 3.0W/(m2,k) Ug 2.6W/(m2,k) Ug 1.9W/(m2,k)
4mm Clear/ 6mm Cavity/ 4mm Clear Ug 3.3W/(m2,k) Ug 3.1W/(m2,k) Ug 2.8W/(m2,k)
4mm Clear/ 6mm Cavity/ 4mm Pilkington K Ug 2.7W/(m2,k) Ug 2.3W/(m2,k) Ug 1.8W/(m2,k)
4mm Clear/ 6mm Cavity/ 4mm Planitherm Total + Ug 2.5W/(m2,k) Ug 2.0W/(m2,k) Ug 1.5W/(m2,k)
4mm Clear/ 8mm Cavity/ 4mm Clear Ug 3.1W/(m2,k) Ug 2.9W/(m2,k) Ug 2.6W/(m2,k)
4mm Clear/ 8mm Cavity/ 4mm Pilkington K Ug 2.3W/(m2,k) Ug 2.0W/(m2,k) Ug 1.5W/(m2,k)
4mm Clear/ 8mm Cavity/ 4mm Planitherm Total + Ug 2.1W/(m2,k) Ug 1.7W/(m2,k) Ug 1.2W/(m2,k)

The location of your property will determine which combination of glass types will provide the best benefits to your property. Our expert team are on hand to advise on the best Heritage Units for your property’s location.

We cannot stress enough the importance of the correct glazing technique for these specialist glass units, to maximise their effectiveness and longevity. All our Westcountry Heritage Units currently have a 2 year guarantee.


01872 276697 Truro@cornwallglass.co.uk

Chyvelah Road, Threemilestone, Truro, TR3 6AZ

01326 375124 Penryn@cornwallglass.co.uk

Commercial Road, Penryn, TR10 8AQ

01736 360174 Penzance@cornwallglass.co.uk

Poniou Way, Longrock Industrial Estate, Penzance, TR20 8HX

01392 364364 Exeter@cornwallglass.co.uk

7-10 Bittern Units, Bittern Road, Sowton Industrial Estate, Exeter, EX2 7LW

01935 412300 Yeovil@cornwallglass.co.uk

22 Garrett Road, Lynx Trading Estate, Yeovil, BA20 2TJ

0117 9710101 Bristol@cornwallglass.co.uk

Units 1-3, 306 Broomhill Road, Brislington, Bristol, BS4 5RG