RBKC Window Rules for Traditional Sash Windows

The Royal Borough of Kensington and Chelsea Has Changed Its Window Planning Rules. What Does This Mean for Flat Owners?

If you own a flat in the Royal Borough of Kensington and Chelsea and have been considering upgrading to double glazing, recent changes to planning rules could make the process much simpler.

The Royal Borough of Kensington and Chelsea has introduced a new Local Development Order (LDO) that allows many flat owners to replace their windows without submitting a planning application, provided the replacement windows meet the council’s design requirements and the property falls within the scope of the new rules.

For homeowners living in period properties with traditional timber sash windows, this could make it easier to improve comfort, energy efficiency and reduce outside noise through traditional sash window double glazing, without compromising the character of their home.

While the changes are welcome, there are still important conditions to consider before replacing your windows. Here’s what you need to know.

Why Has The Royal Borough of Kensington and Chelsea Changed The Rules?

Like many councils across the country, the Royal Borough of Kensington and Chelsea is looking for ways to help homeowners improve the energy efficiency of older properties while preserving the character that makes the borough unique.

Many period homes still have ageing single-glazed timber windows. Although these windows often remain beautiful examples of traditional craftsmanship, they can also cause heat loss, draughts, and higher energy bills.

The new planning changes are intended to remove unnecessary barriers where homeowners are replacing windows like-for-like and maintaining the appearance of their building.

Does This Mean Anyone Can Replace Their Windows?

Not quite.

The new rules do not apply to every property, and there are still important considerations before ordering replacement windows.

For example:

Listed buildings are not covered by the Local Development Order.
Replacement windows must satisfy the council’s design requirements.
The appearance of the building should continue to reflect its original architectural character.

If you’re unsure whether your property qualifies, it’s always worth checking with the Royal Borough of Kensington and Chelsea before beginning any work.

Traditional Sash Window Double Glazing Has Come A Long Way

One of the biggest misconceptions we still hear is that installing double glazing means losing the character of traditional sash windows.

That might have been true many years ago, but modern manufacturing techniques have changed considerably.

Today’s double-glazed units can be incorporated into beautifully crafted timber sash windows that closely replicate the proportions, glazing bars and detailing of the originals, while delivering significant improvements in comfort and energy efficiency. Double glazing options include toughened glass, acoustic glass, slimline glass and conventional double glazing with Argon or Krypton gas insulation, so you can choose the specification that best suits your property.

For homeowners in Kensington and Chelsea, that means it’s often possible to retain the traditional appearance of a period property while benefiting from:

Better thermal performance
Reduced draughts
Less external noise
Lower energy bills
Improved security

Why Bespoke Sash Windows Matter

Every period property is different.

Many of the homes we work on throughout Kensington and Chelsea have subtle differences in their mouldings, glazing bars, sash profiles and architectural detailing.

That’s why we manufacture bespoke timber sash windows rather than relying on standard, off-the-shelf products.

A bespoke approach allows replacement windows to sit naturally within the building while maintaining the appearance that planners, conservation officers and homeowners expect.

It’s also one of the reasons we always encourage customers to think beyond simply replacing a window. The right solution should complement the character of the property for decades to come.

Our Approach

We’ve been manufacturing and installing traditional timber sash windows since 1999.

Over the years we’ve worked on thousands of period properties across London and the South East, including many within conservation areas and architecturally sensitive locations.

Every project starts with understanding the property itself. We look at the existing windows, discuss what’s possible and recommend the most appropriate solution for both the building and the homeowner.

Planning rules may change, but our approach has remained the same: produce high-quality timber windows that respect the original character of the property while delivering the performance expected from modern joinery.

Thinking About Replacing Your Windows?

The recent Royal Borough of Kensington and Chelsea planning changes could make replacing your windows much more straightforward, but every property is different.

If you’re considering traditional sash window double glazing or would like advice on bespoke timber sash windows for your Kensington property, we’d be happy to discuss your options and explain how the latest planning changes may apply to your home.

Get in touch with our team for friendly, no-obligation advice.

* Planning rules vary between local authorities, and conservation area and listed building requirements can change. Always confirm your property’s planning status with the Royal Borough of Kensington and Chelsea before ordering replacement windows.