A Guide To Exterior Window Shutters
Exterior window shutters are fitted to the outside of a building to control sunlight, heat, privacy and noise before they reach the glass. In the UK the main types are hinged decorative shutters, external roller shutters, external venetian blinds and fixed or tilting louvres. The right choice depends mainly on whether you want appearance, heat control, darkness or security.
With UK summers getting hotter and new homes now having to meet overheating rules, more homeowners are looking at shading on the outside of the window rather than the inside. This guide explains the options, what each does well, and how to choose.
What are exterior window shutters?
Exterior window shutters are coverings mounted outside a window or glazed door. Because they sit outside the glass, they stop sunlight before it turns into heat inside the room. Internal blinds and curtains can’t do that, because the heat is already indoors by the time they block it. Exterior shutters can also add privacy, reduce outside noise and give an extra physical barrier over the window.
The term covers several quite different products, so it helps to know which type you mean before comparing prices.
What types of exterior window shutters are there?
There are four main types of exterior window shutter used on UK homes:
Types of exterior window shutters compared
| Type | How it works | Best for | Heat control | Room darkening |
|---|---|---|---|---|
| Hinged (decorative) shutters | Solid or louvred panels that swing closed on hinges | Character and period looks | Moderate when closed | Partial |
| Our pick External roller shutters | Insulated aluminium slats roll down from a box above the window | Heat, darkness, privacy and noise | High | Very high |
| External venetian blinds | Tilting aluminium slats that lower and angle | Heat control while keeping some view and daylight | High | High |
| Fixed or tilting louvres | Permanent angled blades in front of the glass | Architectural shading and south-facing glazing | High designed by orientation | Low |
Hinged exterior shutters
These are the traditional painted shutters often seen on cottages and in Mediterranean homes. They look good, but they usually have to be opened and closed by hand from outside, or by leaning out of the window. That’s impractical on upper floors and for daily use. In the UK they are mostly fitted for appearance.
External roller shutters
External roller shutters are insulated aluminium slats that roll down over the window from a compact box above it, running in side guides. They are usually motorised, so they can be closed at the touch of a button, on a timer, or automatically when the sun comes out. Closed, they cover the whole opening, which is why they are the most effective type for darkening a room and keeping out summer heat.
External venetian blinds
External venetian blinds use tilting aluminium slats. You can angle them to block direct sun while still letting in daylight and keeping some view out, which is useful in living spaces and home offices.
External louvres
Tilting and fixed louvres are larger blades fixed in front of the glazing. They are often specified by architects for large south-facing windows and new builds.
Do exterior window shutters keep heat out?
Yes. Exterior shutters are one of the most effective ways to keep heat out of a home, because they block sunlight before it passes through the glass. Once sunlight gets through a window it becomes heat that is trapped inside, so internal blinds can only reduce glare, not stop the heat. Closing external roller shutters on the sunny side of the house during the hottest part of the day can make a noticeable difference to how warm a room gets.
This is why external shading is recognised as a way to reduce overheating under Approved Document O (Part O), which has applied to new homes in England since June 2022. For existing homes, especially loft conversions, south- and west-facing bedrooms and rooms with large glazed doors, external shading is often the most effective change you can make without air conditioning.
Do exterior shutters help in winter too?
They do. When closed on a cold night, an external roller shutter adds an extra insulating layer and a pocket of still air outside the window, which helps reduce heat loss through the glass. So unlike a summer-only product, roller shutters are useful all year: closed against the sun in summer, and closed in the evenings in winter.
Which exterior shutters are best for bedrooms?
External roller shutters are usually best for bedrooms. They cover the whole window, so they give very effective room darkening for better sleep in the light summer mornings. The insulated slats and box can also reduce traffic and street noise. A quiet-running motor is worth choosing for bedrooms and nurseries. Solar-Shield’s VR150 Silensio has a low-noise motor with soft-start and soft-stop movement for this reason.
Can exterior shutters be fitted to existing windows?
Yes. Many exterior shutters are surface-mounted, so they can be added to existing windows without major building work. The Harol VR150 roller shutter, for example, can be fitted either above the window opening or within the opening against the frame, depending on the property.
If running new cabling is a problem, a solar-powered roller shutter is a good retrofit option. The VR150 Solar is powered by a small panel on the shutter box and a concealed battery, so it needs no mains connection.
Are exterior window shutters good for security?
External roller shutters add a visible physical barrier over the window, which acts as a deterrent. Aluminium slats are much harder to get past than glass alone. Some systems offer an optional security package with lifting resistance and reinforced parts. Not every roller shutter is a certified security product, though, so if security is your main concern, ask your supplier exactly what the specification provides.
How much do exterior window shutters cost in the UK?
The cost depends mainly on:
Type of shutter: decorative hinged shutters, roller shutters, venetian blinds and louvres are priced very differently.
Window size: larger openings need more material and sometimes a bigger motor.
Operation: manual, mains-powered motor, or solar-powered.
Controls: remote, smartphone app or automatic sun sensors.
Finish: standard or bespoke RAL colours for the box and guides.
Installation: access, scaffolding and the number of windows done at once.
Because every exterior shutter should be made to measure, the most accurate figure comes from a quote based on your window sizes, we recommend that you request a tailored quotation to get an accurate cost.
Do I need planning permission for exterior shutters?
Often not, but it depends on the property. Extra restrictions can apply to listed buildings, conservation areas, flats and prominent front elevations. If you’re unsure, check with your local planning authority before you order.
How to choose the right exterior window shutters
Start with what matters most to you:
Keeping rooms cool in summer: external roller shutters or external venetian blinds
Blackout and better sleep: external roller shutters
Daylight and a view while shading: external venetian blinds or louvres
Period or decorative look: hinged shutters
No mains power at the window: solar-powered roller shutters
Large architectural glazing: louvres or venetian blinds
Why choose Solar-Shield?
Solar-Shield has specialised in exterior shading for UK homes, self-builds and architectural projects for more than 35 years. Founder Paul Morris is a Passivhaus Trust member, a Smart Shading Advisor and a member of the British Blind & Shutter Association. We supply and install Harol VR150 external roller shutters made to measure, with smart io control as standard, alongside external venetian blinds, louvres and screens.
Explore our external roller shutters →
Frequently asked questions
-
Exterior shutters usually close fully over the window to give maximum shading, darkness and protection. Exterior blinds, such as external venetian blinds, use adjustable slats so you can control light and keep a view.
-
Most modern external roller shutters are motorised. Solar-Shield’s VR150 comes with smart io control as standard and can connect to Somfy TaHoma for smartphone control and automated routines.
-
Yes. An optional sun sensor can lower the shutters automatically when sunlight gets strong, before the room heats up.
-
Yes. The VR150 Solar runs on a small solar panel and a concealed battery. Once charged, it can keep working for up to 30 days without sun.
-
Yes. The shutter sits outside the window. Slats with ventilation slots and an optional integrated insect screen let fresh air in while the shutter is partly closed.
-
Item description
We hope you found this article useful. Contact us today for a consultation and discover how Solar-Shield can transform your space with cutting-edge exterior shading solutions.
