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Part of our Curtain Wall GuideRelated: Curtain Wall Systems | Aluminum Curtain Wall

There is no single reliable curtain wall cost per m² for a UK project.

A curtain wall quotation depends on what is included in the scope, the system type, glazing, dimensions, performance requirements, finish, access, installation method, project location and programme.

That is why a £/m² figure copied from another project can be misleading.

The more reliable approach is:

Define the required performance → define the system → define the scope → build the budget → compare like-for-like quotations.

For projects in England, thermal requirements should also be checked against the applicable edition and transition arrangements of Approved Document L. The 2026 guidance includes curtain walling within the relevant limiting U-value framework, but the exact compliance route depends on the building and project circumstances.

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Quick Summary

The important point: a £/m² curtain wall price only becomes meaningful when the scope and specification are defined.

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Why Curtain Wall Cost per m² Is Not a Fixed Number

A curtain wall is a system rather than a single material.

Two buildings can both have 5,000 m² of glazed facade but require very different budgets.

One may use:

• standard double-glazed units
• repetitive elevations
• straightforward stick construction
• easy site access
• moderate wind loads
• standard colour

Another may require:

• unitized panels
• high-performance solar-control glazing
• complex corners
• large spans
• high wind pressures
• restricted access
• night installation
• bespoke interfaces

The visible area is similar.

The specification is not.

That is why the most useful question is not:

“What is the curtain wall cost per square metre?”

It is:

“What does the quoted £/m² include, and what specification does it represent?”

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The First Decision: Define the Cost Scope

Before comparing prices, define what the number includes.

A useful budget can be separated into:

A manufacturer may quote only supply to site.

A contractor may price supply and installation.

A facade contractor may include design, engineering, testing and site installation.

Those three £/m² figures should never be compared as if they were equivalent.

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What Drives Curtain Wall Cost?

There are more than four cost drivers, but six have particularly strong influence on early budgeting.

1. Glazing

Glass can have a major effect on the budget, but its share varies by project.

Relevant variables include:

• pane size
• glass thickness
• double or triple IGU
• Low-E coating
• solar-control coating
• laminated glass
• toughened glass
• acoustic requirements
• fire or safety requirements
• spacer specification
• cavity configuration

A premium glazing build can increase cost substantially compared with a standard IGU.

But do not assume that “triple silver = a fixed percentage more.”

The actual increase depends on the supplier, make-up, size, volumes and procurement conditions.

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2. Stick-Built vs Unitized Curtain Wall

System type affects both manufacturing and site economics.

Stick-built curtain wall

Components are generally delivered to site and assembled progressively.

Potential advantages:

• flexible for smaller or irregular elevations
• easier adaptation to site variations
• lower factory content in some projects

Potential disadvantages:

• more site assembly
• potentially higher site labour
• greater exposure to site conditions and programme constraints

Unitized curtain wall

Panels are predominantly assembled under controlled factory conditions and installed as units.

Potential advantages:

• high factory prefabrication
• faster installation on repetitive elevations
• useful for tall or highly repetitive buildings

Potential disadvantages:

• greater factory coordination
• transport and handling requirements
• tighter design and manufacturing interfaces
• higher mobilisation and system-specific complexity in some projects

Therefore, it is misleading to say:

“Stick is cheaper and unitized is more expensive.”

The correct comparison is:

total delivered and installed project cost + programme + access + logistics + risk.

A unitized system can have higher manufacturing complexity but lower site labour and shorter installation time. A stick system can be economical where the elevation is smaller, irregular or easier to assemble on site.

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3. Mullion Size and Structural Requirements

Curtain wall mullions are not selected by a generic “standard depth”.

They are influenced by:

• span
• support spacing
• wind actions
• glazing weight
• infill weight
• allowable deflection
• structural arrangement
• anchor locations

The current UK framework includes BS EN 13830:2015+A1:2020 as the curtain walling product standard. BSI lists it as current.

For wind performance, the relevant standards should be considered separately from the product standard. For example, BS EN 12179:2000 is the current wind-load test method listed by BSI.

This means the budget should not simply say:

“200 mm mullions.”

It should allow for the actual engineered sections required by the project’s spans and loads.

A longer span or higher design pressure may increase:

• mullion depth
• aluminum weight
• reinforcement
• anchor requirements
• handling
• fabrication cost

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4. Thermal Performance

Thermal performance influences both the glazing and frame specification.

Relevant elements include:

• thermal break
• mullion geometry
• transom geometry
• glass build-up
• spacer
• edge conditions
• perimeter interfaces

For England, the 2026 Approved Document L, Volume 2 gives limiting standards for buildings other than dwellings and includes curtain walling within the relevant table. The 2026 edition was published on 24 March 2026 and updated on 8 September 2026.

Do not turn this into a simplistic rule such as:

“U = 1.6 means high-cost curtain wall.”

A U-value target is only one part of the specification.

For budgeting, the correct question is:

What complete frame + glass + spacer + thermal configuration is required to achieve the project’s calculated performance?

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5. Finish

Finish influences material and processing cost, but it should be specified according to the actual architectural requirement.

Possible variables include:

• powder coating
• anodizing
• colour
• gloss
• surface preparation
• approved coating system
• warranty
• exposure condition

Do not use AAMA 2605 as the default UK specification simply because it is a recognised high-performance North American coating specification.

For a UK project, establish the required European/UK coating specification first.

The coating should then be priced as part of the actual project specification.

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6. Installation and Site Conditions

This is one of the biggest omissions in many online curtain wall cost-per-m² guides.

The same curtain wall system can have very different installation costs on two sites.

Consider:

• building height
• access
• crane availability
• MEWP access
• scaffold
• restricted site boundaries
• urban logistics
• delivery windows
• lifting requirements
• floor-by-floor installation
• weather exposure
• temporary protection
• site storage

A £/m² factory price therefore cannot tell you the final installed facade cost.

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A Better Curtain Wall Budgeting Method

Instead of starting with a generic price, work through the following sequence.

Step 1: Define the Building

Record:

• building type
• number of floors
• approximate facade area
• typical bay width
• floor-to-floor height
• project location
• programme
• access constraints

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Step 2: Define Performance

Establish the required:

• thermal performance
• air permeability
• watertightness
• wind performance
• acoustic performance where relevant
• safety requirements
• fire performance where applicable

For UK curtain walling, BS EN 12152:2023 is the current air-permeability performance and classification standard listed by BSI, while BS EN 12154:2000 remains current for watertightness performance requirements and classification.

Importantly:

test method ≠ performance requirement

For example, BS EN 12153:2023 is the air-permeability test method, whereas BS EN 12152:2023 defines performance requirements and classification.

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Step 3: Define the Glazing

Specify:

• double or triple glazing
• glass thickness
• Low-E coating
• solar-control requirement
• safety glazing
• acoustic requirement
• spacer
• gas fill
• visible light requirements where relevant

This gives the estimator a real glass specification rather than a vague “high-performance glass” instruction.

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Step 4: Select the System

Choose the appropriate curtain wall approach:

Stick-built

or

Unitized

or, where required, another engineered system.

The decision should consider:

site labour + programme + fabrication + access + logistics + elevation complexity

rather than factory price alone.

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Step 5: Establish the Structural Configuration

The budget should allow for:

• mullion geometry
• transoms
• reinforcement where applicable
• anchors
• brackets
• movement joints
• structural interfaces

This is where project-specific engineering begins to influence the aluminium quantity.

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Step 6: Establish the Installation Scope

Decide whether the quotation includes:

• installation
• lifting
• access equipment
• sealants
• perimeter interfaces
• flashings
• site testing
• protection
• cleaning

Without this information, two per-m² quotations are often incomparable.

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Step 7: Build the Budget in Layers

A useful early-stage model is:

Facade budget = system + glazing + fabrication + finish + logistics + installation + design/testing + project-specific allowances

This is much more reliable than:

facade area × generic online £/m²

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Cost Comparison Matrix

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Why Online Curtain Wall Prices Are Often Misleading

Suppose two suppliers both quote:

£XXX / m²

That number tells you almost nothing until you know:

• Is glazing included?
• Is installation included?
• Is VAT included?
• Is engineering included?
• Is testing included?
• Is delivery included?
• What system is being quoted?
• What glass is included?
• What finish is included?
• What wind load was assumed?
• What thermal performance was assumed?
• What site conditions were assumed?

A much lower price can therefore mean one of two things:

a genuinely more efficient solution

or

a smaller scope / lower specification.

You need the quotation breakdown to know which one.

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UK Curtain Wall Cost Checklist

Before comparing quotations, create a common RFQ sheet.

This allows the procurement team to compare quotations on the same basis.

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How to Compare Curtain Wall Quotes

Use a like-for-like comparison, not simply the lowest headline price.

Quote A

£/m² includes:

• curtain wall system
• standard double glazing
• factory fabrication
• delivery

Quote B

£/m² includes:

• curtain wall system
• high-performance IGU
• fabrication
• delivery
• installation
• engineering

Quote A may appear cheaper while actually carrying a smaller scope.

A procurement comparison should therefore normalise the quotations before ranking suppliers.

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Should You Budget by m²?

Yes — but only at the appropriate design stage.

At concept or feasibility stage, a £/m² benchmark can be useful for establishing an initial facade allowance.

At tender stage, however, the budget should move towards a defined specification and measured scope.

The closer the project gets to procurement, the less useful a generic £/m² number becomes.

A mature budget therefore progresses like this:

Concept benchmark → outline specification → supplier budget → coordinated design → tender quotation → contract value

That is the correct role of curtain wall cost per m².

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Frequently Asked Questions

How do I calculate curtain wall cost per m²?

Start with the facade area, but do not apply a generic price alone. Define the system, glazing, finish, performance requirements, installation scope, logistics and project conditions first. Then obtain quotations using the same specification.

What drives curtain wall cost?

The main drivers include glazing, curtain wall system type, structural requirements, thermal performance, finish, geometry, installation conditions, logistics and scope of supply.

Is glass always the biggest curtain wall cost component?

No. Glass can be a major cost component, but its proportion varies by specification and project. Installation, unitized fabrication, access, bespoke geometry and other project-specific factors can also materially affect total cost.

Is unitized curtain wall more expensive than stick-built?

Not universally. Unitized systems can involve greater factory fabrication and coordination, while potentially reducing site labour and installation time. Stick-built systems may have lower factory content but require more site assembly. Total project cost depends on the building, labour, programme, access and logistics.

What is a realistic curtain wall cost per m² in the UK?

There is no single reliable UK-wide number without a defined scope. A useful budget must identify whether it includes glazing, fabrication, delivery, installation, engineering, testing, access and other project costs.

Does better thermal performance always cost more?

Not necessarily in a simple linear relationship. A higher-performance requirement can lead to different glazing, framing, spacers or thermal-break configurations, but the final cost depends on the complete system and supplier.

How should I compare two curtain wall quotations?

Put both quotations against the same checklist: system, glazing, thermal performance, air, water, wind, finish, mullions, installation, logistics, engineering, testing and warranty. Only then compare the adjusted total.

Does UK regulation define one curtain wall price?

No. Building regulations establish performance and compliance requirements; they do not set a universal curtain wall selling price. For England, the applicable 2026 Approved Document L provides energy-performance guidance, including limiting U-values, but project compliance depends on the relevant building and design route.

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What to Send a Curtain Wall Manufacturer for a Budget

For a useful preliminary budget, provide:

Project type: office / hotel / residential / retail / mixed-use

Location: city and country

Facade area: approximate m²

Elevation drawings: PDF or CAD

Typical bay: width × height

Floor height: approximate

Glazing requirement: double / triple, Low-E, safety, acoustic

Thermal target: project requirement

Wind design information: where available

System preference: stick / unitized / open to recommendation

Finish: colour and coating specification

Installation scope: supply only / supply + installation

Programme: target delivery / installation period

With those inputs, a supplier can produce a much more meaningful budget than a generic online £/m² estimate.

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Your Next Step

Do not ask for “the price of a curtain wall” without defining the scope.

Send the facade area, drawings, typical bay dimensions, glazing requirement, location and installation scope. A manufacturer can then structure the budget around the actual curtain wall specification rather than an arbitrary benchmark.

Request a curtain wall budget structure →

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Final Takeaway

The most useful curtain wall cost per m² is not the lowest number you can find online.

It is the number attached to a clearly defined specification.

The basic budgeting equation is:

Performance → System → Scope → Quantity → Installation → Total Cost

For UK projects, the specification should also distinguish the applicable regulatory requirements from the commercial pricing assumptions. In England, the 2026 Approved Document L provides the current statutory guidance for projects subject to the 2026 standards, while BS EN 13830 remains the current curtain-wall product standard and BS EN 12152 / BS EN 12154 provide important air and watertightness performance classifications.

The objective is not to predict one universal price.

It is to produce a comparable, traceable and specification-based facade budget.