If you have been researching ways to open up a room, add kerb appeal, or simply let more light and air into your home, you have probably come across the term. So what is a Juliet balcony, exactly - and is it the right choice for your property?
In this guide, we cover everything you need to know: what a Juliet balcony actually is, how much it costs in the UK, what the planning rules say, what building regulations apply, and how glazing choices affect both the look and the price. Whether you are at the early research stage or ready to buy, this guide gives you a clear, honest picture.
What Is a Juliet Balcony?
A Juliet balcony - sometimes called a balconet - is a safety barrier fitted across a full-height window or French door opening. It has no floor, no platform, and no usable outdoor space. You cannot step out onto it. Instead, you open the doors and the balustrade sits across the opening, allowing fresh air and light to flood in while keeping you safe.
The name comes from Shakespeare's Romeo and Juliet - the kind of window-height balcony Juliet would have stood at, looking down. It is a fitting description: it gives you the feel and the view of a balcony without the structural complexity of building one.
This distinction matters for several practical reasons. Because there is no external platform, a Juliet balcony is far simpler and cheaper to install than a full walkout balcony. It also avoids most of the planning and structural requirements that a traditional balcony would trigger.
What Is a Juliet Balcony Made Of? Types and Materials
Juliet balconies come in three main material types in the UK, each with different looks, price points, and maintenance requirements.
Steel Juliet Balconies
Steel is the most affordable option and suits both traditional and contemporary homes. Powder-coated steel balustrades are durable and low maintenance. They are available in a wide range of colours and can be designed with vertical bars, horizontal rails, or decorative scrollwork to suit period properties. Supply costs for a standard steel Juliet balcony typically run from £300 to £800 depending on width and design complexity.
Framed Glass Juliet Balconies
A framed glass Juliet balcony uses an aluminium or steel channel frame around the perimeter of the opening, with a toughened glass panel as the infill. This gives a cleaner, more modern look than metal railings while remaining more affordable than a fully frameless option. Glass is typically 10mm to 12mm toughened. Supply costs generally range from £450 to £900.
Frameless Glass Juliet Balconies
Frameless glass is the premium option. The glass panel is fixed directly to the building using stainless steel point fixings, with no visible frame or handrail. This creates a near-invisible barrier that maximises the view and light. Glass must be at least 17.5mm toughened laminated to meet UK safety standards. Supply costs run from £800 to £2,000 or more for wider spans.
Juliet Balcony Cost in the UK: Full Breakdown
The table below covers the main cost ranges for Juliet balconies in the UK, including typical supply and installation figures:
|
Type |
Supply Cost |
Installation Cost |
Total Estimated Cost |
|
Steel / powder-coated |
£300–£800 |
£200–£400 |
£500–£1,200 |
|
Framed glass (aluminium) |
£450–£900 |
£250–£450 |
£700–£1,350 |
|
Frameless glass |
£800–£2,000 |
£300–£600 |
£1,100–£2,600 |
|
Bespoke / wide span |
£1,000–£3,000+ |
£400–£800+ |
£1,400–£3,800+ |
Costs based on standard residential widths of 900mm to 1,800mm. Wider openings such as bi-fold doors will cost more. London and South East labour rates are typically higher than national averages.
A few additional costs worth factoring in:
- Window to French door conversion - if your opening is currently a standard window, converting it to a full-height door opening will add cost. Expect to pay between £1,200 and £4,500 depending on the door material and any structural work involved.
- Scaffolding or access equipment - for upper floor installations, access equipment is usually needed. This typically adds £150 to £400 to the total.
- Building control inspection - while not always required, some local authorities will want to sign off the installation under Part K of the Building Regulations. Factor in a fee if applicable.
Does a Juliet Balcony Need Planning Permission?
In most cases, no. Juliet balconies usually fall under Permitted Development rights in the UK because they do not create an external platform, do not change the building's footprint, and are not considered a significant alteration to the property's appearance.
However, there are situations where planning permission may be needed:
- The property is a listed building - any external alteration, however minor, requires Listed Building Consent.
- The property is in a conservation area - Permitted Development rights are more restricted here, and you may need consent for changes to the front elevation.
- You live in a flat or maisonette - the Permitted Development rules that apply to houses do not automatically extend to flats. Check with your leaseholder and local authority.
- The balcony has any kind of floor area - the moment a platform is added, even a small one, it is no longer treated as a Juliet balcony in planning terms.
If you are unsure, the simplest route is to apply for a Lawful Development Certificate from your local planning authority. It confirms in writing that your installation is permitted and protects you if you ever come to sell the property.
Building Regulations for Juliet Balconies
Even where planning permission is not required, building regulations will still apply. The key requirements under Part K of the Building Regulations 2000 are:
- The balustrade must be a minimum of 1,100mm high measured from floor level.
- Gaps between any bars or fixings must be no wider than 99mm - this is the 100mm rule, designed to prevent a child's head passing through.
- Glass used in the barrier must meet BS EN 12150 (toughened) or BS EN 14449 (toughened laminated) depending on the fixing method.
- The installation must be able to withstand specified loading requirements as set out in BS 6180.
These are non-negotiable safety requirements. Any reputable installer or supplier will design their product to meet them. If you are purchasing supply-only, always confirm that the product is compliant before ordering.
Juliet Balconies and Natural Light: The Glazing Connection
One of the most popular reasons homeowners install a Juliet balcony is to maximise natural light in a room - particularly in bedroom extensions, loft conversions, and rear-facing living spaces. Pairing a Juliet balcony with a well-designed glazed opening can transform a dark room into a bright, airy space.
If you are already thinking about maximising light from above as well as from the side, it is worth looking at overhead glazing alongside your Juliet balcony project. A flat roof lantern above a kitchen extension or an opening rooflight in a loft conversion work brilliantly alongside full-height glazed doors — combining side light and overhead light for the best possible result year-round.
At Skylights Roof Lanterns, all of our rooflights and skylights are BBA-certified, UK-manufactured, and available with a 10-year guarantee. Whether you are planning a single rooflight or a full glazing scheme for an extension, explore the full range at skylights-rooflanterns.co.uk - or get in touch with our team for advice.
