Juliet balconies are one of those home improvements that look simple from the outside but come with a surprising number of decisions once you start looking into them properly. The name is straightforward. The product itself less so. Steel or glass? Bespoke fabrication or an off-the-shelf system? Does your property need planning permission or not? And why does the quote from a London installer look so different from the national averages you find online?
This guide answers all of that. It covers what a Juliet balcony actually is, what it costs to have one installed in London in 2026, the differences between steel and glass options, and the specific things that affect price in areas like Wimbledon, Chelsea, Fulham, and Clapham, where property styles and local authority requirements add extra considerations.
What Is a Juliet Balcony?
A Juliet balcony is a safety railing or balustrade fixed directly to the exterior of a building at an upper floor opening. It does not project outward from the building and has no floor space to stand on. You cannot step out onto it the way you would a conventional balcony.
What it does do is allow you to install full height French doors or floor-to-ceiling windows on an upper floor without creating a safety hazard. The railing sits flush with, or just in front of, the opening. When the doors are open, air and light flood in and you get an unobstructed view to the outside. When they are closed, the balcony reads as a clean architectural feature on the front of the property.
The name comes from Shakespeare. Juliet stands at her window looking down at Romeo below. She is not stepping out onto a platform. There is no platform. It is a railing at a window, and that is precisely what a modern Juliet balcony is.
This distinction matters practically because it is the reason Juliet balconies almost never require planning permission, are relatively quick to install, and work on properties where a full walk-out balcony would be impossible or cost-prohibitive.
How Much Does a Juliet Balcony Cost in London in 2026?
For a complete Juliet balcony installation in London, covering the balcony itself and professional fitting, most homeowners pay between £1,200 and £4,500 depending on the material, size, and complexity.
That range is wider than many people expect going in. A standard steel railing Juliet balcony for a typical window opening is at the lower end. A fully bespoke frameless glass balcony on a wide Chelsea or Fulham period property, fitted to a non-standard opening and finished in a specific RAL colour, sits at the upper end or beyond it.
Here is a clear breakdown by type:
| Juliet Balcony Type | Supply Cost | Installation (London) | Typical Total |
| Standard steel railing | £400 to £800 | £500 to £900 | £1,000 to £1,800 |
| Framed glass with steel handrail | £600 to £1,200 | £600 to £1,100 | £1,400 to £2,500 |
| Frameless glass (bespoke) | £900 to £2,000 | £700 to £1,500 | £1,800 to £4,000 |
| Bespoke fabricated steel (custom design) | £800 to £2,500 | £700 to £1,500 | £2,000 to £4,500+ |
All installation figures assume ground floor or first floor access. Second floor and above, or sites requiring scaffolding or a platform, adds cost. More on that below.
Why London Prices Are Higher Than National Averages
If you look at comparison sites, you will see national figures for Juliet balcony installation that look considerably lower than the London prices above. There are real reasons for that, and understanding them helps you assess a quote properly.
Labour rates in London for skilled metalwork and glazing installers run between £350 and £600 per day per person. Most Juliet balcony installations require two people for safe handling, particularly for glass panels which can weigh 70 to 170kg depending on width. A standard installation in London typically takes four to eight hours of professional time on site.
In many parts of London, and in SW and inner London postcodes in particular, getting a scaffold tower or platform into a front garden is not straightforward. Restrictions on parking, narrow access paths, and mature front garden planting all add time and sometimes cost to a job that looks simple on paper.
Period properties in Chelsea, Fulham, Clapham, and across Wimbledon often have non-standard window and door openings. Off-the-shelf balcony systems are manufactured in fixed width increments. When your opening does not match those increments, a bespoke fabrication is needed. That takes longer and costs more, but it produces a balcony that actually fits rather than one with visible gaps or crude adaptations.
Steel vs Glass: Which Is Right for Your Property?
This is the central decision and the one that most affects both the look and the price.
Steel Juliet Balconies
A steel Juliet balcony consists of a fabricated metal railing, typically with vertical or horizontal infill bars, fixed to the building around the window or door opening. The frame and infill are both metal throughout.
Steel is the right choice for period properties. Victorian, Edwardian, and Georgian homes across Wimbledon, Clapham, and South West London look better with a metal balcony than a glass one. The material reads as sympathetic to the architecture rather than grafted on. It also allows for decorative detailing, whether that means curved tops, cast-style infill panels, or a specific pattern that mirrors existing ironwork on the property.
From a maintenance perspective, a hot-dip galvanised steel balcony with a quality powder coat finish is very low maintenance in London’s urban environment. The powder coat needs no annual treatment. If it chips, it can be touched up with matching paint. Expect a well-made steel balcony to last twenty to thirty years or more without significant intervention.
Supply costs for a standard steel Juliet balcony in a typical residential width of 1,200mm to 1,800mm run from £400 to £800. Bespoke fabricated designs with decorative features or non-standard dimensions cost more, starting from around £800 and rising depending on complexity.
At NOVA Steels, all steel Juliet balconies are fabricated in-house and finished to the specific requirements of each opening. No two are identical because no two properties are.
Framed Glass Juliet Balconies
A framed glass balcony uses a steel or aluminium channel frame around the perimeter of the opening, with a toughened glass panel as the infill. The glass is typically 10mm to 12mm toughened and sits in the frame rather than being fixed directly to the building.
The framed glass option sits between steel and fully frameless glass in terms of cost and visual impact. It has a more modern look than a metal railing but less of the floating, invisible quality of frameless glass. It suits contemporary extensions and newer builds well, and it is a popular choice for loft conversions across Wimbledon and Clapham where the opening is flush with a new flat roof dormer.
Supply costs run from £600 to £1,200 for standard residential widths. Bespoke sizes and non-standard RAL colours add to that.
Frameless Glass Juliet Balconies
Frameless glass balconies use a single panel of toughened laminated glass, typically 17.5mm or 21.5mm thick, fixed directly to the building structure through stainless steel point fixings. There is no surrounding frame and no top rail in basic specifications. The glass appears to float in front of the opening.
The visual effect on the right property is striking. Light is completely unobstructed. The facade reads as clean and contemporary. For modern new-builds, architect-designed houses, and high-end renovations in Chelsea and Fulham, this is typically the specification that designers and homeowners reach for.
The trade-offs are cost and fitting precision. The glass panels are heavier than framed options. A 2,100mm wide panel at 17.5mm laminated weighs close to 100kg. Handling requires a minimum two-person installation and sometimes external access equipment. The fixing points must be set out precisely within 2mm tolerance for the glass to seat correctly. Done properly, a frameless glass balcony is a beautiful and long-lasting product. Done poorly, it is an expensive problem.
Supply costs for frameless glass panels run from £900 to £2,000 for standard residential widths, and above that for larger spans, low-iron extra-clear glass, or complex fixing geometries.
What Affects the Final Price
Opening width
Width is the single biggest cost driver. Most standard residential windows sit between 900mm and 1,500mm wide. A Juliet balcony for that size of opening is a standard product. Wider openings, such as bi-fold door sets and double French door arrangements common in Chelsea basement conversions and Fulham rear extensions, push into non-standard territory. A 3,000mm frameless glass panel is a very different product from a 1,200mm one in terms of glass weight, fixing requirements, and handling complexity.
Access and scaffolding
Ground floor and first floor installations can usually be managed from a ladder or small platform. Second floor and above, particularly on London period properties where window head heights are already generous, typically requires a scaffold tower or cherry picker. Scaffolding hire for a single-day residential job in London costs between £200 and £600 depending on the equipment needed. This is usually not included in a supply price and should be specifically asked about when getting quotes.
Door conversion
A Juliet balcony requires a full height outward or inward opening door behind it. If you currently have a standard window at that position, converting it to a door opening is a separate structural job. This typically involves removing the window, forming a new wider and taller opening, installing a new lintel, hanging the doors, and making good internally and externally. In London, this conversion typically costs between £2,500 and £6,000 depending on the structural work involved. It is not part of a balcony quote and is worth budgeting for separately if your opening is not already door height.
Conservation areas and listed buildings
Large parts of Chelsea, Fulham, Wimbledon Village, and Clapham fall within conservation areas. Standard permitted development rules still apply to Juliet balconies in most conservation areas because the balcony sits flush with the building and does not project outward. However, some local authorities have additional Article 4 directions that restrict even minor alterations on the front elevation, and listed buildings always require listed building consent regardless of the scope of the work.
If your property is in a conservation area or is listed, it is worth checking with your local planning department before ordering anything. Your installer should flag this during a site survey. The UK planning portal is the starting point for guidance on what applies to your specific property.
Building Regulations: What You Need to Know
Unlike planning permission, building regulations compliance is not optional and applies to all Juliet balcony installations regardless of property type or location.
Under UK building regulations, a Juliet balcony must achieve a minimum height of 1,100mm above finished floor level. This is the critical safety requirement because a balcony at any lower height does not provide adequate fall protection at an opening where the floor drops away on the other side.
For glass installations, the glass must be either toughened to BS EN 12150 or toughened laminated to BS EN 14449. Standard float glass or ordinary window glass cannot be used. For frameless glass specifically, the structural calculation confirming the glass panel and fixing system meet the required load of 0.74 kN per metre must be available for inspection.
No gap in the balcony infill whether steel bars or glass panels with exposed edges should exceed 100mm. This prevents the risk of a child’s head passing through.
A reputable installer will provide documentation confirming compliance with these requirements as part of the handover. Under HSE guidance on balustrade safety, the installer carries responsibility for ensuring the installed product meets these standards. If a quote does not mention building regulations compliance, ask specifically how it is handled before you proceed.
Juliet Balcony Costs by London Location
Prices vary across London not just because of access and property type but because of the nature of the properties themselves and the level of finish that local homeowners expect.
Wimbledon and SW19. Victorian and Edwardian houses dominate and steel is the most common choice because it sits naturally with the architecture. Bespoke fabrication is often required because original window openings in this housing stock are not standard modern sizes. Typical total costs for a complete steel Juliet balcony installation in Wimbledon run from £1,400 to £3,000.
Chelsea and Fulham. These are premium markets and the specification reflects that. Frameless glass and bespoke steel with decorative detail are both common. Conservation area and listed building considerations apply to a significant proportion of properties in both areas. Typical costs for a complete installation in Chelsea or Fulham run from £2,000 to £4,500 and above for complex or premium specifications.
Clapham. A mix of Victorian terraces and modern conversions creates demand for both steel and glass options. Rear loft extensions in Clapham frequently incorporate Juliet balconies as part of the dormer design. Typical costs run from £1,400 to £3,500 depending on specification.
Wandsworth and Putney. Similar property profile to Wimbledon. Steel is popular on period properties. Costs are broadly in line with the SW19 range.
What to Look for in a Juliet Balcony Installer in London
Getting a Juliet balcony right is partly about the product and partly about the installation. A few things worth checking before you commit:
Ask whether the company fabricates in-house or supplies from a third-party manufacturer. In-house fabrication means the people quoting you are the people making the product. If anything needs adjusting because of a non-standard opening, an unusual window sill detail, or a drain pipe that falls in an awkward position, it can be handled without going back to a remote factory. For period London properties with nonstandard features, this matters more than it might on a modern new-build.
Ask specifically about building regulations compliance and ask for the documentation at handover. A reputable installer will include this as standard. If it is not mentioned in the quote, treat that as a red flag.
Ask about the fixing system and what the wall fixing goes into. In London’s older housing stock, external walls can be brick, stone, rendered brick, or a combination. The fixing specification needs to suit the wall type. Fixings into soft lime mortar behave very differently from fixings into engineering brick, and the installer should know the difference.
For glass installations, ask for the glass specification in writing. At minimum it should be toughened laminated glass to the appropriate British Standard, and the thickness should be confirmed based on the width of your specific opening.
About NOVA Steels
NOVA Steels is a bespoke metalwork company based in Wimbledon, designing and installing steel Juliet balconies, metal balustrades, bespoke metal railings, and outdoor railings for residential and commercial properties across London.
Every balcony we install is fabricated by our own team. We do not outsource to third-party manufacturers. That means the team that designs your balcony around your specific opening is the same team that makes it and fits it. For London properties where no two openings are quite the same, that continuity matters.
We work across Wimbledon, Chelsea, Fulham, Clapham, Wandsworth, Putney, Richmond, Kingston, and the wider SW and KT postcode areas.
Book a Free Site Survey
The most accurate way to get a price for your specific property is a site visit. At NOVA Steels, the free site survey covers measuring your opening, assessing the wall construction and fixing options, discussing material and design preferences, reviewing any planning or conservation area considerations, and providing a clear written quote.
There is no obligation and no pressure to proceed.
Call us on 020 7117 2642 or get in touch through our contact page. We cover SW19, SW20, SW3, SW6, SW4, SW11, SW15, SW18, TW9, TW10, KT1, KT2, and surrounding areas.
NOVA Steels. Bespoke Juliet Balconies, Railings and Gates. Wimbledon, London. CAME Approved. 10-Year Warranty.
