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High-Quality Windows – Double Glazing & Energy Efficiency

Heritage steel-look bedroom window installed by Keystone Glazing in Chichester

Windows Made for Your Home

At Keystone Glazing, we supply and install high-quality windows designed for energy efficiency, security and style. Whether you’re upgrading your home, replacing old windows or fitting windows in a new extension, our team makes sure every window is surveyed, made to measure and fitted properly.

We are a local, family-run company with more than 25 years’ experience, fitting uPVC, aluminium and timber-look windows in homes across Chichester and West Sussex – from new-build estates to period cottages and listed terraces.

Our Window Range

We work with manufacturers we trust:

  • REHAU uPVC windows – affordable, low-maintenance and highly energy-efficient, in white, cream, grey, black and woodgrain finishes.
  • SMART aluminium windows – slim, modern sightlines and exceptional durability.
  • Residence Collection – flush sash windows with the look of traditional timber joinery and the low maintenance of a modern frame.
  • Timber windows – traditional sash and casement windows for period and listed homes.

Other products are available on request. Read more about timber-effect double glazing and the Residence Collection.

Window Styles

Casement windows

The most popular style in the UK: versatile, easy to operate and available in chamfered or sculptured profiles.

Flush sash windows

The opening sashes sit flush with the frame, like traditional timber joinery – ideal for cottages, period homes and anyone who wants a cleaner look.

Sash windows

A classic heritage style with modern glazing, as in our timber sash windows for a listed terrace in Hamble.

Tilt and turn windows

Great for ventilation and easy cleaning from the inside, and a good choice for upstairs rooms.

Bay and bow windows

Add character, light and extra space to a room.

Georgian bars and heritage details

Georgian bars, monkey-tail handles and steel-look profiles give new windows a traditional character. See our full house of Georgian-style windows in Bosham.

White woodgrain flush sash uPVC window on a clad garden annex in Chichester, West Sussex
White uPVC window with Georgian bars set in a brick wall in Chichester

Colours and Finishes

Choose from white, cream, grey and black, or woodgrain finishes such as golden oak, rosewood, Irish oak, anthracite grey and Chartwell green, with a different colour inside and out if you like. Handles and hardware come in a range of finishes to match.

Glass Options

  • A-rated double glazing as standard, to keep heat in and reduce energy bills.
  • 32mm high-performance glass – our alternative to triple glazing, without the extra weight or cost.
  • Triple glazing for the very best insulation and noise reduction.
  • Obscure, toughened and laminated glass for bathrooms, doors and low-level panes.

Not sure which is right for you? Read our answer to triple glazing and double vs triple glazing.

Benefits of Double-Glazed Windows

  • Energy efficiency – reduces heat loss and improves insulation.
  • Security – multi-point locking systems and secure handles.
  • Less noise – helps block outside sound for a quieter home.
  • Increased property value – modern, efficient windows improve kerb appeal.
  • Low maintenance – durable frames that resist weathering and warping.

Our Window Installation Process

1. Free consultation and quote – we measure up, talk through styles, colours and glass, and give you a clear written quote.

2. Made to measure – your windows are manufactured to the exact size of each opening.

3. Professional installation – carried out with minimal disruption, with old frames and waste taken away.

4. Final inspection and certification – we check every window and register the installation with CERTASS so it is certified as meeting building regulations.

Why Choose Keystone Glazing for Window Installations?

  • More than 25 years’ experience – a local, family-run team.
  • CERTASS registered – every installation is certified as meeting UK building regulations.
  • A 10-year product guarantee on everything we fit.
  • Insurance Backed Guarantee – your guarantee is protected for peace of mind.
  • Honest advice with no pressure selling – free, no-obligation quotes.

Replacing every window in the house? See our double glazing installations. For misted or broken windows, see double glazing repairs.

Areas We Cover

We supply and fit windows across Chichester, Bognor Regis, Emsworth, Selsey, Felpham, Pagham, Barnham, Littlehampton, Arundel and the surrounding areas of West Sussex and the Hampshire border.

Window Questions

How much do new uPVC windows cost?

It depends on the size, style, colour and glass of each window. We give a free, fixed written quote after measuring up, with no pressure to buy.

Which is better, uPVC or aluminium windows?

uPVC is affordable, warm and low-maintenance. Aluminium has slimmer frames and a more modern look. Both are highly energy-efficient; we will help you choose what suits your home and budget.

Do I need triple glazing?

For most homes, A-rated double glazing or our 32mm high-performance glass gives excellent results. Triple glazing is worth considering for very exposed or noisy locations.

Are your window installations certified?

Yes. We are CERTASS registered, so every installation is certified as meeting building regulations, and you receive a certificate for your records.

Can new windows look like traditional timber?

Yes. Flush sash windows from the Residence Collection and woodgrain uPVC finishes give the look of timber with far less maintenance.

Which areas do you cover?

We cover Chichester, Bognor Regis, Emsworth, Selsey, Felpham, Pagham, Barnham, Littlehampton, Arundel and the surrounding areas of West Sussex and the Hampshire border.

Get a Free Window Quote

Tell us about your windows and we’ll arrange a free survey and no-obligation quote. Call 01243 302841 or email info@keystoneglazing.co.uk.