Windows
Replacement windows, properly fitted.
A-rated Rehau frames in 1,500+ colour options. Fitted by Clarendon's family team across Essex, Kent and London — with NAPIT registration handled for you.
Rehau A-rated · PAS 24 Secured by Design · 10-year frame guarantee · NAPIT registered
Window Styles
Styles to suit every property.
From traditional sash to contemporary tilt-and-turn — we'll match the right window to your home and how you use it.
Casement
The classic. Side-hinged or top-hinged, opens outward. Excellent ventilation and easy to clean. The most common choice for British homes.
Sash
Vertical-sliding sash windows that fit period properties beautifully — without the draughts or rattle of the originals.
Tilt-and-Turn
European-style windows that tilt inward for ventilation or swing fully open. Effortless to clean from inside, perfect for upper floors.
Bay & Bow
Bay and bow windows that add light, space and character. Replaced in matching style to your existing arrangement — including curved heads.
Heritage
For conservation areas and listed buildings. Slim sightlines, traditional details, modern thermal performance.
Materials that last.
Three frame materials. Each fitted by the same family team.
uPVC (Rehau)
Our Standard
Our default choice. Rehau A-rated frames in 1,500+ colour options, with PAS 24 / Secured by Design protection built in. Multi-chambered for thermal efficiency. Effectively maintenance-free for 25+ years.
Aluminium
For Modern Builds
Slimmer sightlines, larger glass areas. Powder-coated in any RAL colour. Ideal for contemporary extensions, sliding doors and large picture windows where you want the glass to be the feature.
Timber-Effect
For Period Properties
The look of timber, the longevity of uPVC. Woodgrain finishes, full bead detailing, heritage colours. Period charm without the maintenance.
Why Our Windows
Warmer. Safer. Quieter.
Energy
A-rated, all year.
- A-rated WER (Window Energy Rating)
- U-values from 1.2 W/m²K
- Argon-filled units, low-emissivity coatings
- Reduces heat loss by up to 30% vs older glazing
Warmer in winter. Cooler in summer. Lower heating bills.
Security
Built to keep your home safe.
- PAS 24:2022 compliant
- Secured by Design (Police-approved) standard
- Multi-point locking system
- Internal glazing beads — glass can't be removed from outside
Police-approved security as standard, not an upgrade.
How it works.
Five steps. No pressure, no commission salespeople.
01
Enquiry
Drop us a message or call. We'll book a free survey for a time that suits you.
02
Free Survey
Mica or a team member comes to you, measures up, talks through your options, and answers your questions.
03
Quote
A clear, written quote — no pressure, no upselling. Take your time.
04
Install
Our fitters arrive on the agreed date. Cleanly removed, cleanly fitted, mess cleared as we go.
05
NAPIT Registration
We register your installation with your local council and provide your insurance-backed guarantee.
Recent window projects.
Our gallery is coming soon. In the meantime, browse what we've been up to on our Facebook page or Instagram →
Why Clarendon
A quarter-century of doing it the right way.
Family-run since 1999
Three generations of craftsmen. The same name on the van as on the paperwork.
TrustMark & NAPIT registered
Independently vetted. Government-endorsed. Your deposit and workmanship are protected.
10-year guarantee
On every installation. Backed by insurance — not just a promise.
Essex, Kent & London
Local installers, local knowledge. We've been working these streets for 26 years.
Flexible finance
Spread the cost.
Keep the standard.
Interest-free and low-rate options available on most projects, subject to status. No-deposit plans on selected installations.
0%
APR available
10yr
Workmanship guarantee
26yr
Family-run track record
£0
Deposit options
Frequently asked.
Thinking about your next home improvement?
No hard sell. No pressure. Just an honest conversation about what you'd like to do — and what it would take to do it properly.