Double-Glazed Window Blind Systems Cost

Choosing how to dress double-glazed windows is a decision that commonly arises during a window replacement project, a new-build fit-out, or a renovation where existing window coverings look tired or mismatched. With several blind system types available — from factory-fitted integral units to retrofit roller blinds — costs and long-term implications vary considerably. The right choice often depends on timing: systems sealed inside the glazing unit during manufacture are rarely possible to add retrospectively.

Key points

• Integral blinds are factory-sealed inside the glazing unit and typically cost £150–£400 per unit in the UK (indicative UK costs, last reviewed 2026-05-07).
• Once a sealed unit's integral blind fails or its hermetic seal is compromised, the entire unit must be replaced — the mechanism cannot be repaired independently.
• Retrofit internal blinds for existing double glazing start from around £30–£150 per window, depending on blind type, material, and window size.
• External roller shutters may require planning permission in conservation areas, on listed buildings, or in Article 4 Direction areas — check with your local planning authority before specifying.
• Motorised integral blind systems typically cost £400–£800+ per unit and require an electrical connection routed within the window frame at the time of installation.

What types of blind system work with double glazing?

There are three broad categories of blind system used with double-glazed windows in UK homes.

Integral (sealed unit) blinds are installed between the two panes of glass during manufacture. The blind — usually an aluminium venetian slat or pleated fabric — is operated by a magnetic control on the outer frame, so no part of the mechanism is accessible from inside the room. Because the unit is hermetically sealed, dust cannot reach the blind. Internal condensation, however, is a sign of seal failure and would require full unit replacement rather than a blind repair.

Internal retrofit blinds are fixed to the window reveal, frame, or wall inside the room. These include roller blinds, roman blinds, venetian blinds, and perfect-fit blinds that clip directly onto the inner frame without drilling. They are the most common and affordable option for existing windows.

External roller shutters or solar blinds are mounted outside the glazing, either above the frame in a hood box or within a built-in guide-rail system. These offer strong solar shading and added security but are the most expensive option and may be subject to planning controls depending on the property type and location.

How much do integral blinds cost in the UK?

Indicative UK costs, last reviewed 2026-05-07.

The cost of integral blind systems varies by unit size, glass specification, and supplier. A standard casement window unit with a basic magnetic-operated venetian integral blind typically costs £150–£400 per unit, including the glazed unit itself. Large bay window sections or patio door panels with integral blinds sit at the higher end, often £300–£600 per unit.

Motorised integral blinds, controlled by remote or smart-home integration, carry a significant premium — expect to pay £400–£800+ per unit. An electrical supply must be routed to the frame during window installation; retrofitting the wiring later is complicated and may damage internal wall finishes.

These figures relate to the glazed unit itself. Overall installation costs depend on the scope of the window replacement project. Integral blinds are usually specified as an upgrade when ordering new windows, not purchased separately afterwards.

How much do retrofit blinds for existing double glazing cost?

For homeowners who already have double-glazed windows, retrofit blinds are the practical route.

Perfect-fit blinds clip onto the inner bead of most double-glazed frames without drilling, providing a neat finish. These typically cost £50–£150 per window depending on size and can usually be self-installed.

Roller or roman blinds fixed to the reveal or wall above the window start from around £30–£80 for off-the-shelf options at DIY retailers, or £80–£300+ for made-to-measure versions from specialist suppliers.

Venetian blinds (aluminium or wooden) are available from around £20–£60 in standard sizes, with made-to-measure wooden options reaching £100–£300+ per window. Wooden venetians are not suited to humid rooms — kitchens or bathrooms — where they may warp.

All retrofit internal blind prices are indicative; exact costs depend on fabric, finish, motorisation, and supplier. Obtain at least three quotes before committing to made-to-measure or professionally installed products.

Blind system types compared

Homeowner checklist: choosing a window blind system

Work through this list before specifying or purchasing any blind system.

• Are you replacing windows, or working with existing double glazing? (Determines whether integral blinds are viable at all)
  
• Is your property in a conservation area, an Article 4 Direction area, or listed? (Check with your local planning authority before specifying external shutters)
  
• Do you have young children or vulnerable adults at home? (Integral and cordless options eliminate cord-strangulation risk)
  
• Are the windows in a humid room such as a kitchen or bathroom? (Avoid wooden venetians; check whether perfect-fit frames allow adequate ventilation)
  
• What is the solar orientation of the windows? (South- or west-facing rooms may benefit more from solar-control glass or external shading than internal fabric blinds)
  
• Have you confirmed frame compatibility for perfect-fit blinds? (Not all profiles accept clip-in systems — ask the retailer for a compatibility template)
  
• Is smart-home or remote-control integration a priority? (Plan the electrical supply during the window installation phase, not afterwards)
  

When to get professional help

Most internal blind installations do not require a professional, but seek expert input if:

• You are specifying integral blinds as part of a full window replacement — discuss unit specification, warranty terms, and installation method with your FENSA-registered window and door installers to ensure everything is correctly documented.
• External shutters are being considered — a specialist should assess fixings, weatherproofing, and any planning requirements before work begins.
• Motorised blinds require new electrical circuits or connections within window frames — a qualified electrician should carry out this element.
• Your property is listed or in a conservation area — check with the local planning authority before installing any external roller shutters, as these may constitute a material change to the building's appearance and require consent.

How Housey can help

If you are planning a window replacement and want to include integral blinds, or need a specialist to supply and fit windows with built-in systems, Housey can help you request and compare quotes from qualified window and door installers across the UK.

Frequently asked questions

Can I add integral blinds to my existing double-glazed windows?

No — integral blinds are factory-sealed inside the glazed unit during manufacture. To have them, you would need to replace your existing glazed units with new ones that include the blind. This is usually only worthwhile when the windows are already due for replacement, as the cost of unit-only swaps is rarely justified purely for the blinds.

Do integral blinds affect a window's energy efficiency?

Integral blinds have minimal effect on a window's U-value. Thermal performance is primarily determined by the glass specification, number of panes, and frame quality rather than the blind itself. Some manufacturers claim a marginal additional benefit, but energy efficiency should not be the primary reason to choose integral blinds over upgrading the glazing specification.

Are corded window blinds still legal in the UK?

New corded blinds must comply with BS EN 13120:2009+A1:2014, which requires child-safety features. From May 2022, further restrictions applied to unsafe corded blinds sold to UK consumers. Cordless or integral options are strongly recommended in homes with young children. Confirm with your supplier that any corded product meets current UK safety standards before purchasing.

What warranty should I expect on integral blinds?

Reputable manufacturers typically offer 5–10 years on sealed glazing units, usually covering the integral blind mechanism. Check the terms carefully: some warranties are voided if the unit develops internal condensation — a sign of seal failure — or if the frame is cleaned with incompatible products. Ask your installer for full warranty documentation before installation.

Can I fit perfect-fit blinds myself?

Yes — most perfect-fit blinds clip onto the inner bead of compatible double-glazed frames without drilling and are designed for DIY installation. Check the manufacturer's compatibility guide for your specific frame profile before purchasing. If frames are non-standard or the windows are large and heavy, a professional blind fitter can measure and install them accurately.

Sources and further reading

• FENSA — the glazing industry's self-certification scheme — FENSA
• Permitted development rights for householders: technical guidance — GOV.UK
• Windows and glazing energy-saving advice — Energy Saving Trust
• Blind and shutter safety — British Blind and Shutter Association (BBSA)