Sash Windows Replacement & Renovation

Bespoke Wooden Sash Windows

In this case the southerly aspect had caused damage beyond reasonable repair so the box frames had to be stripped out to the masonry.

It being a widely accepted view that period property is valued higher when original features are intact is a given with period home ownership. It wasn’t always that way however but since the mid 1990’s wooden sash windows have been undergoing a major revival – and due to environmental pressures a bit of a rethink.

Wooden sash window replacement and refurbishment is where we cut our teeth back in the 80’s and that makes us one of the oldest companies still going in this traditional field.

We consider each sash window project a chance to show off our honed skills. From Transport For London’s Victoria HQ to various country piles and from the RAF Club Mayfair’s  20 foot tall sash windows  to Holland Park’s Debenham House with Dulwich Estate properties and a wealth of charming period housing stock in London, and the Home Counties in between.

…and so were replaced with high performance timber sash windows.

It’s worth mentioning from the outset here that wooden sash window refurbishment, about 60% of our works, covers an aspect defined as ‘part renewal’ so unless a window has been thoroughly neglected and is probably to a southerly aspect – causing accelerated decay due to the sun peeling off paint substrates and exposing woods to rain and damp – most box frames (sub-frames) are left in fair to good order. Replacing seasoned wood can be wholly unnecessary and is regarded as bad practice. Structural and cosmetic remedial works are also at issue and risk. Our refurbishment process has the box frame refurbished to a high standard. The sliding sashes within existing frames are invariably worn out though and wouldn’t accommodate sealed unit double glazing anyway so they are normally renewed. The renewed  sashes are manufactured very carefully so as to replicate the original detail. When fitted to a refurbished box frame you now have a sash window set that looks new. There is information aplenty on this website to guide you; from the type of timber you should be using to Building Regulations to the trade terms explained in our PDF guide on the homepage.

Each project we undertake, be it renovation and refurbishment to existing sash windows or complete renewal, we make all our windows and sundry items in our joinery in South London which not only means better fitting items but speedy problem solving. We also adhere to the same traditional hand made joinery standards that ensure absolute authenticity. That, coupled with state of the art double glazing and our own in-house designed weather proofing system, produces unbeatable customer satisfaction.


Beaverwood School Chiselhurst during an extensive refurbishment to the box frames. The sashes were renewed.

…and after. Just in time for school!

We ensure our wooden sash windows are as energy and acoustically efficient as possible meeting Part L Building Regulations when complete renewal is the order of the day. Over the years we’ve innovated and introduced various solutions that make producing exact copy-of-original period sash windows that conform to today’s environmental demands not only possible but the norm. For example – we fit our own in-house designed weather proofing system that has stood the test of time (it’s not brush-pile but a durable proper solution) and we don’t use lead weights when installing double glazed sash windows which are far too toxic for anyone’s liking, we have our own unique system called the Sashpro Balance that offers an assisted lift and a smoother action.

All in all we aim to be as helpful, open and honest to you as possible and like most show-offs simply love sharing our knowledge gained over the last couple of decades. We even have an open information policy and will assist you in choosing the right materials for the right aspect of a given project – you can download our courtesy information PDF from our homepage and throughout this site you can glean other information vital to your project’s success for example; on wood selection and correct usage please click here

The ‘railway cottages’ in Clapham

An investment in your own home/castle/country pile can be daunting. Who to trust, am I paying the right price etc…

These concerns and worries can be allayed by reference and reputation so please feel free to investigate us thoroughly by taking up references and having a look at some of our projects, you’re most welcome.

Our standards of practice are regulated and industry leading and we are local authority approved contractors.
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Sashpro Ltd | 1 Beadman St, London, SE27 0DN