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Aluminium Secondary Glazing with Safety Glass

Horizontal Sliding Aluminium Secondary Glazing

Starting from £163.66


Benefits of Clearview Secondary Glazing:

  • High performance acoustic insulation to soundproof your home.
  • Improved thermal insulation reducing energy costs.
  • Effective condensation removal for added protection.
  • Enhanced window security with secondary glazing.
  • Discreet slimline design to retain the character of your home.
  • Multiple options for easy window access.

If you’re unsure about your Secondary Glazing needs, feel free to contact us or check out our help centre for fitting and measuring guides as well as plenty of additional support.


Select your desired product type
Choose your panel configuration
Input your window measurements How to measure your windows accurately?
Colour and glass can be changed at the next stage.
£163.66
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What makes our Aluminium Secondary Glazing the market leader?

  • Lab accredited thermal and acoustic insulation
  • Durable and long-lasting Aluminium Frames
  • Toughened Safety Glass
  • Patented Seal
  • Manufactured in the UK
  • Leading Secondary Glazing specialists

At Clearview we use the finest materials for all of our products to ensure you receive a high-quality finish. Our aluminium secondary glazing systems are durable and long-lasting and are designed to withstand wear and tear and extreme weather conditions.

Find out more about our products...

Real Customer Stories

Julie Burnham - Sheffield Customer Review
"We have a large stain glass window at the front of our house and needed a solution to retain heat and keep out noise. Clearview's Secondary Glazing has made a massive improvement. We are really impressed it even seems to have eliminated our problem with condensation."
Julie Burnham | Sheffield
Stuart Saunders - Sheffield Customer Review
"The windows in our house were a bit draughty to say the least and we needed something to stop that. Clearview came highly recommended by a friend. The secondary glazing was a very cost effective product and achieved an excellent result for us. An added bonus was that the secondary glazing even stopped an attempted break in."
Stuart Saunders | Sheffield
Robert Eaton - Doncaster Customer Review
"We would recommend Clearview to anyone looking for secondary glazing. The whole process has been fantastic and has definitely made a big difference to our house. The difference in the sound level is amazing and the house is so much quieter inside."
Robert Eaton | Doncaster

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Quick Measurement Guide

Measure Twice

Always double-check your measurements for a perfect fit

Use Metal Tape

More accurate than fabric tapes

Check Square

Ensure window frame is square before measuring

Use Millimetres

Our system works best with precise measurements

Comprehensive Measuring Guides

1. Quick Guide

1. Quick Guide

2. Technical Information Guide

2. Technical Information Guide

3. Measuring Guide

3. Measuring Guide

4. Installation Guide

4. Installation Guide

Installation Options

Feature DIY Installation Professional Installation
CostSave on installation costsFull service included
TimeInstall at your own paceQuick, efficient installation
ExpertiseBasic DIY skills neededExpert trained installers
SurveySelf-measurement requiredProfessional site survey
WarrantyProduct warranty onlyFull installation warranty
SupportPhone/email supportComplete project management

DIY Installation

Save Money

Perfect for confident DIYers with basic skills

  • ✓ Easy-to-follow guide included
  • ✓ All fixings provided
  • ✓ No special tools needed
Get Measuring Guide

Professional Installation

Full Service

Complete peace of mind with expert fitting

  • ✓ Professional site survey
  • ✓ Expert installation team
  • ✓ Full warranty coverage
Check Coverage

Professional Installation Process

1

Get a Free Estimate

Tell us your window sizes and types. We'll provide a no-obligation estimate.

2

Pay Deposit & Book Your Survey

Secure your spot with a 50% deposit (includes £150 survey fee).

3

Professional Site Survey

Our qualified installer visits to take precise measurements.

4

Price Confirmed

Once the survey confirms the scope, your quote is locked in.

5

Order & Manufacture

Once approved, your custom glazing is made to order in our UK factory.

6

Delivery

We deliver the units directly to your property.

7

Expert Installation

Our team fits your new glazing with minimal disruption.

8

Final Payment

The final 50% balance is paid on completion.

No surprises.

What's Included

When you choose our secondary glazing installation service, you're getting more than just quality products — you're investing in a complete, end-to-end solution delivered by experienced professionals.

Expert advice & service support
UK-manufactured bespoke units
Quick and efficient tidy after installation
Impressive site survey
Ease of mind with expert installers

Care & Warranty

Clearview provides comprehensive warranty coverage across our entire product range. Our 10-year guarantee demonstrates our commitment to quality and customer satisfaction.

10

10-Year Guarantee

Aluminium frames covered for 10 years against manufacturing defects

2

2-Year Moving Parts

Locks, handles, rollers, and hinges covered for 2 years

Professional Installation

Full warranty coverage when installed by our expert team

What's Covered

  • 10 years — Aluminium frames
  • 2 years — Moving parts (locks, handles, rollers, hinges)
  • 1 year — Spring balances
  • 14 days — Glass (reviewed individually, toughened/laminated only)

Note: For Supply Only orders, installation issues are not covered. Full warranty applies when installed by our professional team.

Reporting a Problem

Important: Please inspect your units within 10 days of delivery. If you notice any issues:

  1. Don't install the unit if there's a problem
  2. Email us immediately at [email protected]
  3. Include photos to help us identify the issue
  4. Keep the unit in its original location for collection if needed

What to Expect on Delivery

Timber sub-frames may show marks — This is normal and designed to be hidden during installation
Frames may be out of square — They'll be pulled square during installation
Units may need cleaning — Factory-fresh units require final clean-down post-installation

Size Guidelines & Production Viability

The ratios of Width × Height × Panel Size × Glass Weight affect how easy it is to construct units that meet your demands.

If the online estimate system can't figure it out, it will tell you if the unit is too big or too tiny, or it will propose glass upgrades.

IMPORTANT: The maximum sizes depend on the width or height of each span, but not both. Weight determines if a panel size may be manufactured.

Maximum width is determined by panel weight and height. It may not be possible to make some units in the maximum width/height specified and will need to be clarified at point of enquiry.

  • Glass weight must not exceed the maximum panel weight.
  • Maximum area for 4mm glass is 1.6m². If panel size exceeds this, allow for 6mm toughened glass.
  • Maximum area for 6mm glass is 3.0m². If panel size exceeds this, allow for 6.4mm laminated glass.
  • Flyscreens: maximum size 1200mm in one direction

If you need any more assistance, email us with sizes of the required unit.

Performance Recommendations

For Sound Proofing

6.4mm Acoustic

Excellent for high noise; pairs best with 150–200mm air-gap.

acousticsafety

For Thermal Insulation

Low E Toughened

Boosts insulation up to ~10% over standard; ideal 50–80mm gap.

thermalsafety

Condensation

Low E Toughened

Improves inner pane temperature, reducing condensation risk.

thermalsafety

Safety & Security

6.8mm Clear Laminate

Class A safety; strong deterrent and impact resistance.

safetysecurity

Glass Options for Secondary Glazing

Glass Weight Calculator

Use this calculator to estimate the weight of your secondary glazing unit. These figures are estimates — always consult with our team for precise calculations.

Frequently Asked Questions

The Measuring Process is easier than you may think, whilst very important it does not require pinpoint accuracy as not all windows fit standard shapes.

The idea is to ensure when fitting into a reveal or within a frame boarder, the unit is slightly smaller than the tightest narrowest points. this ensures the unit will fit and gives some room for adjustment, we recommend a 10 mm tolerance deduction to the total measured width and height, this is the build size of the frame and the sizes used to get a quote.  Gaps and distortions around the frame are all hidden and sealed by the Edging Trim. 

See The Measuring Guidance for more information and additional links below:

If you are surface mounting around a window reveal to the internal wall sash windows l or around a glass panel (face fixing) – you will need to ensure the frame is wider than the recess to get a fixing into the frame/face of the area being treated, this would be adding the width of the frame on each of the four sides of the window – unit frame size details can be accessed in the Product Brochures.

Most of our business is to the DIY market, Units are supplied fully assembled, predrilled and glazed, easy installation ready.

If you follow the simple step by step Measuring Guide, the units will easily lift into position, with a few adjustments to get level, all of which is fully explained in the Installation Guide, the units can be fixed in place and the supplied finishing trim applied to cover, seal and hide any gaps and inaccuracies between the wall and frame.

If you haven’t got a contact you can rely on we can suggest using the Which Trusted Trader search service, just enter your postcode and search for Carpenter /Joiners, you should get a list of qualified and verified tradesmen in your area and whilst we can’t offer Personal recommendations, they will be more than capable of carrying out the work.

Yes, we can provide most glass types, based on the specific needs of your project. The thickness of standard glass is 4 mm toughened, This safety glass is a minimum requirement where building regulations demand health and safety considerations, including the distance from floor and doors. All our glass options conform to BS6206: 1981 / BS EN 12600 for impact resistance.  We do not offer float (non-safety glass). Subject to panel size this may default to a thickness of 6 mm toughened. Laminated, Acoustic, Thermal Low-E, and Obscure glass options can be accommodated. The standard for Sliding, Lift-Out, Hinged & Insert panels are single glazed.

This ensures the frame profiles are manageable size to operate as an unobtrusive secondary window, creating a double-glazed arrangement with the primary window. This offers significantly higher soundproofing performance than double glazing (which is a poor acoustic barrier) thermally it will offer equivalent thermal performance to many double-glazed products – see the performance data in the Help Centre 

  • The Vision range can accommodate a thickness of up to a 6.8 mm glass.
  • The Vision Ultra Panel fits the standard frame options but can accommodate between an 8.8 mm to a 10.8 mm glass.
  • The Vision HD Hinged System can accommodate up to a 28 mm Sealed double glazed unit.

See our Full Glass Ranges options 

What is Low-E Glass?

Low-emissivity glass (or low-e glass as it is commonly referred to) is a type of energy-efficient glass designed to prevent heat escaping through your windows to the cold outdoors. Low-e glass such as Pilkington K Glass™ Range has an invisible coating which reduces heat transfer and reflects interior heat back into your room. This can offer a 5-10% increase to the thermal insulation performance of a non-coated glass.

With secondary glazing it is a hard coat application, it has a robust quality, but can be scratched if abrasive materials are used to clean the glass, see maintenance.

What is Laminated Glass & Acoustic Laminate Glass.

Both are basically the same structure, with 2-layers of glass sandwiching a polymer sheet, the plastic film is usually 0.4 mm or 0.8 mm thick, so a 6.4 mm laminate is 2 layers of 3 mm glass either side of a 0.4 mm film, an 8.8 mm laminate is 2-layers of 4 mm glass either side of an 0.8 mm film.

With a standard laminate, the plastic layer will increase impact resistance and a high performing safety / security option. With the Acoustic Options, it is exactly the same make-up, but the polymer liner is a material called Polyvinyl butyral (PVB) which enhances the ability to absorb and dissipate the sound energy within the glass structure more effectively. Obscure glass options are available but priced on application.

Obscure glass options are available but priced on application.

It is difficult to give exact details, as every property and everybody can be affected differently by noise pollution, however the science confirms, Clearview Secondary Glazing can reduce noise by as much as 80% or by over 50 decibels, (a reduction of 3dB is equivalent to halving the noise energy) this is 5 times greater than either double or triple glazing. This is subject to final specification and installation limitations, these details can be clarified during a consultation with one of our advisors. But the number one target is to try and put as much space between the existing glass and new secondary glazing kit, The bigger the air-gap, the better the performance. If the space allows, try and get 100 mm + to an optimum 150 mm to 200 mm. where space is limited a thicker glass will help. We always recommend starting with a 6 mm glass for soundproofing.

Soundproofing for comprehensive information

Watch Our Performance Video

We have test certification which confirms that Clearview Secondary Glazing can enhance the thermal insulation of a single glazed window by as much as 65% or a U-Value of 1.868 W/m2K (a U-Value is the formula for measuring heat loss the bigger the number the more inefficient the window is, a standard single glazed window has a recognised U-Value of approx. 5.8 W/m2K). This performance is better than a Class C, with some products this performance can be as much as A+. English Heritage and Historic Scotland carried out research through Glasgow University which showed secondary glazing out performed double-glazed replacement windows. This is subject to final specification and installation limitations these, details can be clarified during a consultation with one of our advisers. See our Thermal Insulation pages.

The cost of secondary glazing varies depending on factors such as the size of your windows, the type of glazing chosen, and the complexity of the installation. Typically, prices start from £163.66 per window, making it a more affordable alternative to double glazing. Investing in secondary glazing not only reduces energy bills but also enhances comfort and property value. Secondary glazing is a cost-effective solution for improving energy efficiency, sound insulation, and security in your home, get a quick and easy quote to find out what it will cost you.

Yes, for many homes it is a great upgrade that provides a wide range of benefits from cost-saving to value added. This means your return on investment is almost guaranteed, and you won't regret getting it installed. Especially if your home suffers from condensation, draughts or noise pollution.

Yes, whether you're an avid DIYer or a beginner, any secondary glazing kit in our product range can all be fit by you if you have a few tools and some spare time.

Still unsure?

Arrange a call-back

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