New windows for Conservation Areas

When we designed Timberlook flush sash windows, we were careful to consider all aspects of Article 4 Conservation Area Guidelines for windows. We combined those design principles with the latest technology and most cost-effective materials.

Timberlook Flush Sash windows are modern, thermally efficient and secure. They are beautiful to look at at and, most importantly, preserve the traditional look of your property. Our flush casement windows are maintenance free, do not warp, swell or flake like wooden frames, and will not need sanding or painting over time.



Timberlook Flush Sash Windows can meet local authority conditions for use in conservation areas and were recently accepted by Cotswold Council for a large project in Tetbury:

“…[Timberlook] UPVC units have been accepted as a variation on Condition 11, they are considered to successfully mimic traditional flush casements, and care has been taken over details such as the sill and trickle ventilation…”

Heritage Officer, Cotswold Council

for Architects, Conservation Officers, and Specifiers

Timberlook Flush Sash Design Guide

Click to Download

What is Article 4?

Article 4 is when a planning authority applies to restrict development rights in a conservation area. Replacement windows then need Planning Permission. This is quite rightly done to preserve architectural merit. Some planning authorities precluded the use of modern materials because the window designs were inappropriate in size, shape and design.

A more modern approach has been to approve the use of Timberlook because of its consideration of the Article 4 directives. It has been specifically designed to replicate the documented historical window designs from the period. “The use of modern material should be accepted provided that the window is of design, dimensions, detailing and opening mechanisms are similar to the original window.”

You should always obtain Planning Permission from the Local Planning Authority before commencing work.

What are Listed Buildings

Listing a building marks it out as having special architectural or historic interest and brings it into the consideration of planning systems – protecting those features for future generations.

Listing does not freeze a building in time, it simply means that listed building consent must be applied for in order to make any changes to that building which might affect its special interest.

It is usually more difficult for you to replace windows in these buildings and Listed Building consent is required from your Local Authority.

Listed buildings can be altered, extended and sometimes even demolished under government planning guidance. The local authority uses listed building consent to make decisions that balance the site’s historic significance against other issues, such as its function, condition or viability.