One of the most common questions weāre asked is, ‘How often should sash windows be replaced?’
The truth is, thereās no one-size-fits-all answer, but there are clear signs to look out for, and peace of mind to be had when you choose quality windows with lasting guarantees.
How Long Do Sash Windows Last?
While sash windows arenāt immortal, the ones we install are designed to stand the test of time. Every window from Sash Windows London is backed by extensive warranties:
- 30 years against timber rot and decay
- 10 years on glazing
- 10 years on paint and stain finishes
- 5 years on hardware
- 10 years on workmanship
These guarantees give our customers confidence and clarity. If your windows begin to show signs of wear within those timeframes, you may already be covered.
That said, even the highest-quality windows will naturally age over time. Especially in harsher environments like coastal locations. If your sash windows are a few decades old, itās wise to check them periodically for signs of decline.

Choosing the Right Time to Replace
If you’re considering replacement, speak to our expert team first. Thanks to advancements in design, materials, and energy efficiency, new sash windows can offer much more than a like-for-like upgrade.
Modern sash windows can help reduce your energy bills, lower outside noise, strengthen security, require less maintenance, and best of all, are an investment protected by extensive product and installation warranties.
7 Signs Itās Time for Replacement
If youāre unsure whether your sash windows need replacing, here are some signs to look out for:
- Persistent condensation between panes
- Noticeable draughts or rattling
- Warped or sticking sashes
- Rising energy bills
- Fading of furnishings due to UV exposure
- Water ingress or discolouration around frames
- External noise becoming more noticeable
These indicators suggest your current windows are no longer delivering the performance you need, and that itās time to upgrade to something better, and guaranteed to last.
Explore Our Replacement Sash Window Range

We supply a full range of high-performance sash windows, designed to suit period properties, conservation areas, and modern homes alike. The range includes Timber Sash Windows, Timber Heritage Sash Windows, uPVC Sash Windows, and uPVC Heritage Sash Windows ā and all come backed by our comprehensive warranties.
Professional Installation, Guaranteed Quality
Replacing sash windows isnāt a job to take lightly. Our expert installers ensure a flawless fit, carried out in line with FENSA regulations and covered by a 10-year workmanship guarantee. Rest assured that your home is in safe hands.
Ongoing Maintenance for Long-Term Performance
While our products are built to last, routine maintenance helps keep your sash windows performing at their best. Over time, timber frames naturally expand and contract, and settling can occur, particularly in older homes. We also provide a care pack with all timber installations to help you look after your windows.
Speak to Our Experts Today

Whether youāre upgrading for comfort, efficiency, or aesthetics, our friendly team is here to help you find the right sash window replacement. Get expert advice, enjoy free site surveys, and rest easy knowing your investment is protected for years to come. Contact us today.