uPVC Window Services across Southeast England

uPVC windows are a popular choice for homeowners across the UK because they’re cost-effective, durable, energy-efficient and low maintenance. They won’t rot, warp or flake, and only need an occasional wipe-down to stay looking new. Our modern uPVC systems also feature slim sightlines and a wide range of design options to suit any property.

Yes — our uPVC windows are designed to reduce heat loss and lower energy bills. With options for A-rated double or triple glazing, warm-edge spacers and low-E glass, we’ll specify the right combination to achieve excellent U-values and comply with the latest Building Regulations.

We supply and install the full range of uPVC window styles: casement, flush sash, sliding sash, tilt & turn, bay and bow. Each style can be customised with colour finishes, decorative glazing, handles and hardware to perfectly suit your property.

Security comes as standard. Our uPVC windows feature multi-point locking systems, reinforced frames and optional laminated safety glass. Many of our ranges can also be specified to meet PAS 24 or Secured by Design standards for additional peace of mind.

In most cases, replacing existing windows with like-for-like uPVC alternatives does not require planning permission. Exceptions include listed buildings or conservation areas, or if you’re changing the size of openings. We’ll advise you during your free survey and liaise with your local authority if needed.

You’ll receive a 10-year insurance-backed guarantee on our installations, plus manufacturer warranties on frames, hardware and glass units. Your installation is also FENSA-registered, and we’ll supply the compliance certificate for your records and resale value.

The cost of new uPVC windows depends on style, size, glazing and finishes. We provide a free, itemised quote with no hidden extras, so you can see exactly what you’re paying for. Flexible finance options are also available (subject to status).

Our uPVC windows come in a wide range of coloured foils, from classic white and anthracite grey to woodgrain finishes that mimic natural timber. Dual-colour options are also available, giving you one colour outside and another inside to match your décor.

Most standard uPVC window installations take 1–3 days for an average house, depending on access and the number of units. We’ll confirm your exact installation timeline during your quotation and keep you updated throughout the process.

Yes — in addition to full installations, we provide a repair service, including replacement sealed units, hinges, locks, handles and seals. We’ll always advise on the most cost-effective option: repair vs replacement.

We install and repair uPVC windows across Hampshire, West Sussex, East Sussex, Surrey, Berkshire and parts of Kent & Greater London from our Crawley base. See our Areas We Cover page for the full list.

It’s simple: Call 0800 368 9166, message us on WhatsApp 07932 960284, email sales@instantwindowsanddoors.co.uk or use the Request a Quote form. We’ll arrange a convenient survey and provide expert advice tailored to your home.