uPVC & Aluminium Windows in Surrey
A-rated energy-efficient windows, expertly installed across Caterham and Surrey. Six styles, two materials, outstanding thermal performance — supply and fit from your local FENSA-registered installer.
uPVC or Aluminium — We Supply & Install Both
Replacing your windows is one of the most impactful home improvements you can make — for comfort, appearance, energy efficiency, and property value. At Ensure Windows, we specialise in both uPVC windows and aluminium windows for homes across Caterham, Surrey, and South London.
Our uPVC windows are manufactured on 70mm 6-chamber profiles, achieving A+ Window Energy Ratings as standard. Our aluminium windows use thermally broken profiles with slim sightlines, allowing more glass and more light — ideal for contemporary homes and extensions.
Every window we supply is made to measure, fitted by our own FENSA-registered installation team, and backed by a 10-year guarantee. We cover all of Surrey including Caterham, Redhill, Reigate, Oxted, and surrounding areas.
Speak to our Surrey window team
Free no-obligation surveys across Caterham, Redhill and all of Surrey.
Six Styles. Endless Possibilities.
From the most popular casement to elegant vertical sliders, find the window style that suits your home's character and your budget.
The UK's most popular window style
Casement Windows
Hinged on the side and opening outward, casement windows provide excellent ventilation and are available in virtually any size. Ideal for almost every room in the home.
Popular for
Bedrooms, living rooms, kitchens
Maximum ventilation and easy cleaning
Tilt & Turn
Tilt inward for secure ventilation, or turn fully open for easy access and cleaning. The most versatile window style for modern homes, especially upper floors.
Popular for
Apartments, upper floors, kitchens
Period character with modern performance
Vertical Sliding Sash
Authentic sliding sash appearance with the thermal and security performance of modern materials. Perfect for Victorian and Edwardian homes across Surrey without sacrificing efficiency.
Popular for
Victorian & Edwardian homes
Create a statement with added space
Bay & Bow Windows
Bay windows project outward from the wall to create a bright alcove and extra floor space. Available as classic 3-panel bay or graceful curved bow configurations.
Popular for
Front rooms, living rooms
Clean lines, architectural precision
Flush Sash Windows
The sash sits flush with the outer frame for a sleek, contemporary appearance. Popular in conservation areas and premium new-build developments where clean lines are essential.
Popular for
Conservation areas, new builds
Frame your view perfectly
Fixed & Picture Windows
Non-opening fixed panes maximise glazing area and create dramatic picture window effects. Ideal alongside opening casements or as standalone feature windows.
Popular for
Stairwells, feature walls, landings
A+ Energy Ratings as Standard
Every window we supply meets or exceeds the BFRC Window Energy Rating A+, well above current UK Building Regulations requirements.
BFRC Window Energy Ratings
British Fenestration Rating Council
A+
Window Energy Rating A+
All our windows achieve a minimum Window Energy Rating of A+ under the BFRC scheme. This is the recognised UK standard for window energy performance and is above the current Building Regulations requirement.
1.2W/m²K
Outstanding U-Values
U-value measures how much heat escapes through a window. Our standard units achieve 1.2 W/m²K, with triple glazed upgrades reaching 0.8 W/m²K — significantly better than the 1.6 W/m²K required by Building Regs.
ArgonGas Filled
Argon-Filled Cavities
Every glazing unit is filled with Argon gas, which has lower thermal conductivity than air and reduces heat transfer by up to 30% compared to air-filled units — at no extra cost.
Low‑E
Low-E Softcoat Glass
Our standard specification includes a low-emissivity softcoat on all glazing. This coating reflects radiant heat back into the room while still allowing solar warmth in — improving comfort and reducing heating costs.
U-Value Comparison — How We Measure Up
Lower U-value = better thermal performance. U-values shown are for complete window unit (frame + glass).
uPVC vs Aluminium — Full Spec Breakdown
Compare both materials side by side or view each specification in full. Not sure which to choose? We can advise during your free survey.
uPVC Windows
Value & performance
Aluminium Windows
Slim & contemporary
Choose uPVC if…
- You want the best value for money
- You prefer traditional white or woodgrain finishes
- You're replacing windows in a period property
- You want a 10-year guarantee at the lowest cost
Choose Aluminium if…
- You want slim sightlines and maximum glass
- You want a custom RAL powder-coat colour
- You're building or renovating a contemporary home
- You want the highest long-term durability
Security Built In, Not Bolted On
Every window we install includes PAS 24 enhanced security hardware as standard — the specification required by Secured by Design and most buildings insurers. This is not an optional upgrade; it is our baseline.
All windows are glazed with laminated or toughened safety glass as appropriate. For ground floor and accessible windows, we recommend our Secured by Design certified units with anti-jemmy protection and 3D adjustable hinges.
PAS 24 Hardware
Multi-point shootbolt locking as standard on all casement & tilt-turn windows
Secured by Design
Police-backed accreditation available on request — ideal for insurance requirements
Anti-Jemmy Beads
External glazing beads prevent glass removal from outside on all styles
Building Regs Compliant
FENSA certified installation ensures legal compliance for all window replacements
Serving Caterham, Surrey & South London
Window supply and installation across all of Surrey and South London
Don't see your area? Call us on 07852 636 300 — we cover a wide radius from our Caterham base.
Our Simple 4-Step Process
Free Home Survey
We visit your home, assess your existing windows, measure every opening and advise on style, material and colour options.
Written Quotation
You receive a clear itemised quote within 48 hours — broken down per window, fully fitted. No hidden charges.
Manufacture
Your windows are made to your exact measurements in the UK, typically within 2–4 weeks of order confirmation.
Expert Installation
Our FENSA-registered installers fit your windows to the highest standard, leaving your home clean and secure.
What Our Window Customers Say
“We had 12 windows replaced throughout our 1930s semi. The flush sash uPVC windows look exactly like the original steel crittal windows but with incredible thermal performance. Our heating bills dropped noticeably the first winter.”
Helen & Marcus Vickers
Caterham, Surrey
“Chose aluminium casement windows for our extension and couldn't be happier. The slim sightlines let in so much more light and the Anthracite Grey finish looks stunning against the brick. Installation was immaculate.”
James Okonkwo
Redhill, Surrey
“Our Victorian bay windows were draughty and showing their age. Ensure Windows fitted beautiful vertical sliding sash units that have transformed the front of the house and made the sitting room so much warmer.”
Patricia Alderton
Oxted, Surrey
Frequently Asked Questions
Get Your Free Window Quote in Surrey
Contact our Surrey window team today for a free, no-obligation survey and written quotation. We cover Caterham, Redhill, Reigate, Oxted and all surrounding areas.
Why choose Ensure Windows?