Timber Casement Windows in London and Surrey

The most popular and cost-effective timber is cross grain laminated redwood frames on hardwood sills. Hardwood sills prevent that part of the window from rotting, due to the sill sitting on the damp exposed stone or brickwork. Cross grain laminated redwood is created by sawing the redwood into strips, and then bonding it back together with the grains facing opposite directions.

When the strips try to twist in opposite directions, they simply counter each other and the frame distortion is minimal. The service life of premium laminated redwood casement windows – assuming they are maintained – is around 50 years, which can be extended with refurbishment.

South-facing windows generally need to be painted more regularly than north-facing windows. If you’d prefer a longer service life than 50 years, see the upgrade options below.

Teknos, a world-leading timber paint manufacturer (and one of our preferred microporous paints), has conducted extensive research on the life span of
timber windows.

This research has proven that where timber windows are sealed, painted and glazed in a factory rather than on site (known as factory-finished), they will last up to a third longer and will require significantly less maintenance than windows that are glazed and painted on site.

Extend your painting cycles by applying 3-6 coats (or three thicker coats) of Teknos timber microporous paint at the start. We’ve found that, compared to standard painting cycles of 2-4 years, this additional step can extend your painting cycles to 8–12 years.

This technologically-advanced microporous paint allows the timber to breathe and prevents any flaking that you might see with oil-based paints. It essentially acts as a sun screen, preventing the sun’s harmful UV rays from damaging the timber underneath the paintwork. It’s worth noting that south-facing paintwork will require more frequent repainting those that are facing north.

There are a few ways that you can protect the paintwork at home as well. Washing the polluted dust from the external faces with a sponge and water twice a year can have a big impact. And when it comes to repainting, ensure you use the same water-based microporous paint as a base coat, which can be applied without sanding or removing the sashes, as you’d ordinarily do with oil-based paints.

Choose from either a first fix or fully-finished installation. First fix gives you the flexibility of having your windows installed into the opening, ready for your own builder to complete the finishing touches to the interior.

Opt for the fully-finished installation, however, and our approved installers will do it all for you, including making good the internal plasterwork, installing and painting the internal window boards and period architraves to perfectly match your new frames.

For extra security on the hinge side of opening sashes, a discreet ‘dog bolt’ can be fitted to the inside of the frame and sash.

It is out of sight and, when the sashes are closed, steel clasps lock it securely in place and prevent the hinges from been forced open from the outside.

Using the latest super soft coat low-e double glazing will ensure that your windows prevent more heat escaping than ever before. Furthermore, you can specify additional coatings and glass types for specific rooms to further enhance security, sound proofing and prevent harmful UV light from fading carpets and furniture.

Performance glazing can also prevent any overheating in south-facing rooms, conservatories and orangeries. Ask for details on performance glazing.