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Part of our Building Envelope Guide

Related: Curtain Wall vs Window Wall | Unitized vs Stick-Built Curtain Wall

Curtain Wall Cost per m2: What Should You Actually Budget?

There is no reliable single number for curtain wall cost per m2 because the price represents an engineered façade rather than a commodity product.

For a UK commercial project, the final budget can change substantially according to:

• Glass specification
• Stick-built or unitized construction
• Mullion and transom design
• Finish
• Thermal requirements
• Fire and spandrel detailing
• Access and installation
• Engineering and testing
• Project size and repetition

Recent UK industry pricing guidance illustrates how wide the range can be. One 2026 market guide places supplied-and-installed stick curtain walling around £450–£750/m² and unitized systems around £650–£1,000+/m², while other UK suppliers publish broader ranges. These figures should be treated as indicative market references, not tender prices, because project scope can move the final figure significantly.

Key principle: establish the performance and scope first, then compare the price per square metre.

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Quick Cost Summary

The important point is that two quotations with the same £/m² can represent completely different levels of performance.

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1. Glass Is One of the Biggest Cost Drivers

The glass normally represents a major portion of a curtain wall because it covers most of the façade.

The price can change significantly with the glazing build-up.

Common Variables

Do not ask a supplier:

“How much does your curtain wall cost per m2?”

and accept an answer without defining the glass.

Instead specify:

pane thickness + cavity + Low-E coating + gas fill + spacer + laminate where required.

For example, a quotation using standard double glazing should not be compared directly with one using laminated solar-control IGUs.

The second system may be more expensive because it is doing considerably more.

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2. Unitized vs Stick-Built Changes the Cost Model

The fabrication method can significantly affect curtain wall cost per m2.

Stick-Built Curtain Wall

Individual mullions, transoms and glazing components are assembled at the project.

Advantages:

• Lower factory complexity
• Flexible site installation
• Easier local adjustment
• Suitable for irregular façades

Cost pressures:

• Higher site labour
• More site assembly
• Greater dependence on installation conditions

Unitized Curtain Wall

Larger panels are substantially assembled in the factory and then transported to site.

Advantages:

• More factory-controlled assembly
• Faster site erection on repetitive façades
• Reduced site glazing and assembly
• Strong fit for high-rise repetitive grids

Cost pressures:

• Factory tooling
• Panel handling
• Transport
• Lifting logistics
• Greater importance of building tolerances

Recent UK pricing references generally place unitized curtain walling above stick-built systems on an initial £/m² basis, although the total project cost depends on labour, programme and access.

This is why unitized does not automatically mean “more expensive overall.”

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3. Mullion Depth Is a Structural Cost, Not a Design Preference

Curtain wall mullions are sized according to the project.

The required section depends on:

• Wind pressure
• Span
• Building height
• Support conditions
• Mullion spacing
• Allowable deflection
• Glass weight

A shallow section may work for a low-rise sheltered façade.

A tall exposed elevation may require a substantially deeper section.

That changes:

aluminum quantity → extrusion weight → system cost

The correct engineering sequence is:

Design wind load → structural calculation → mullion section → aluminum quantity

not:

cheaper profile → hope it passes

For UK projects, curtain wall performance is covered by BS EN 13830:2015+A1:2020, which BSI currently lists as the curtain-wall product standard. It covers the curtain-wall kit as a whole, including fixings, and addresses characteristics including weather resistance, safety and energy performance.

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4. Finish Can Change the Price and Lifecycle Cost

Finish is often underestimated in early budgets.

Typical options include:

• Powder coating
• Anodizing
• Higher-performance architectural coatings
• Project-specific specialist finishes

The price difference depends on:

• Coating system
• Colour
• Surface area
• Pretreatment
• Exposure
• Warranty
• Minimum production quantities

Do not specify:

“Premium finish”

Instead define:

For a large façade, changing the finish specification after production starts can create both cost and schedule problems.

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5. Installation Can Be a Major Part of the Budget

A curtain-wall quotation is often misunderstood because different suppliers include different scopes.

One supplier may quote:

aluminum + glazing

while another includes:

engineering + fabrication + delivery + installation + testing + supervision

Those are not comparable numbers.

Scope Comparison

Access can also change cost significantly.

High-rise installation may involve:

• Mast climbers
• Cranes
• Hoists
• BMU access
• Scaffolding
• Restricted delivery routes

Recent UK cost guidance also identifies access, programme, project complexity and coordination as major pricing variables.

Therefore, curtain wall cost per m2 should always be associated with a defined scope of supply and installation.

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6. Thermal, Solar and Fire Requirements Add Cost

A curtain wall is part of the building envelope, so performance requirements can change the specification considerably.

For England, the 2026 Approved Document L gives a maximum U-value of 1.6 W/m²K for curtain walling in the relevant table for buildings other than dwellings. The document also notes that project-specific energy considerations and other performance requirements can affect the solution.

The actual façade specification may therefore require:

• Thermally improved framing
• Higher-performance IGUs
• Solar-control Low-E
• Warm-edge spacers
• Insulated spandrels
• Thermal interfaces
• Project-specific calculations

Fire performance can introduce additional costs as well, particularly around:

• Spandrel zones
• Slab-edge fire stopping
• Fire barriers
• Compartmentation interfaces

Fire resistance should be specified for the tested façade assembly, not inferred from aluminum or glass alone. BSI’s BS EN 15254-6 provides an extended-application framework for fire-resistance testing of non-loadbearing walls including curtain walling.

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7. Engineering, Testing and Documentation Are Part of the Price

The final cost is not only material.

A professionally engineered curtain wall package can include:

• Shop drawings
• Structural calculations
• Thermal calculations
• Air-performance testing
• Water-performance testing
• Wind-performance testing
• Mock-ups
• Samples
• Installation details
• Quality-control records

For air permeability, BSI currently lists BS EN 12152:2023 as the current standard for curtain-wall air-permeability requirements and classification.

For thermal performance, the curtain wall needs to be evaluated as a system rather than by claiming that a particular aluminum profile is “thermally efficient.”

This is why the engineering allowance should be identified separately during tendering.

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What Actually Builds the Curtain Wall Budget?

A practical budget model is:

Glass + aluminum framing + finish + hardware/accessories + engineering + fabrication + logistics + installation + testing

That is much more useful than assuming a single £/m² figure.

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2026 UK Indicative Curtain Wall Cost Range

Publicly available 2026 UK industry references currently show substantial variation.

One recent UK guide indicates approximately:

Other UK suppliers publish wider bands, including approximately £500–£900/m² or higher for more complex architectural curtain walling.

These ranges should not be used as a final tender budget.

They are useful only for early-stage orientation because the final price depends on:

façade area + glass + system + structural requirement + finish + access + installation scope.

How to Build a More Accurate Budget

Use this sequence before requesting supplier prices:

This sequence prevents the common mistake of fixing a £/m² budget before the façade requirements have been defined.

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How to Compare Curtain Wall Quotes

Never compare the total first.

Build a technical comparison sheet.

A lower £/m² figure can simply mean:

• Less expensive glass
• Shallower profiles
• Lower finish specification
• No installation
• No engineering
• No testing
• Excluded fire stopping
• Different logistics assumptions

Compare the scope before comparing the number.

For a Starveil project, you can submit your aluminum façade drawings and project information so the system and budget can be reviewed against the actual design.

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What Should You Send for a Curtain Wall Budget?

Before asking for a quotation, prepare:

• Elevation drawings
• Typical section
• Total façade area
• Floor heights
• Mullion spacing
• Opening locations
• Glass specification
• Thermal target
• Wind information
• Finish requirement
• Installation location
• Required scope
• Project programme

The more complete the input, the less likely the supplier will need to build large contingency into the quotation.

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Frequently Asked Questions

How much does curtain wall cost per m2 in the UK?

Indicative 2026 UK industry references place standard supplied-and-installed stick curtain walling around £450–£750/m² and unitized systems around £650–£1,000+/m². Other suppliers publish wider ranges. These are market references rather than guaranteed project prices because glass, access, system design, finish and scope can change the final cost substantially.

What drives curtain wall cost?

The major drivers are glass specification, stick-built or unitized construction, mullion design, finish, thermal and solar requirements, engineering, testing, logistics and installation. The scope of supply can be just as important as the material itself.

Is unitized curtain wall more expensive than stick-built?

Unitized systems usually have higher factory and logistics costs, while stick-built systems generally require more site labour. For high-rise repetitive façades, unitized construction can offset its higher fabrication cost through faster installation. The total project comparison depends on site conditions and programme.

Is glass the most expensive part of a curtain wall?

Glass is usually one of the largest cost components because it covers most of the façade, but it is not necessarily the most expensive line in every project. Unitized systems, access, structural framing and installation can become major cost drivers on complex projects.

Does mullion depth affect curtain wall cost?

Yes. Mullion depth is influenced by wind load, span, spacing, glass weight and allowable deflection. Deeper structural sections generally use more aluminum and can increase fabrication and material cost.

Does thermal performance increase curtain wall cost?

Usually. Higher thermal targets can require thermally improved framing, more sophisticated IGUs, solar-control coatings, warm-edge spacers and additional thermal calculations. For England, the 2026 Approved Document L lists 1.6 W/m²K as the maximum U-value for curtain walling in the relevant non-domestic table.

Should installation be included in the £/m² price?

You need to know whether it is included before comparing quotations. A supply-only curtain-wall price cannot be directly compared with a quotation that includes delivery, installation, engineering, testing and site supervision.

What standard applies to curtain walling in the UK?

BS EN 13830:2015+A1:2020 is the current BSI-listed product standard for curtain walling. It covers the curtain-wall kit as a whole, including fixings, and addresses performance characteristics such as weather resistance, safety and energy performance.

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Bottom Line

Curtain wall cost per m2 is a specification-driven number, not a universal market price.

For a UK project, establish:

glass → thermal target → system → mullion → finish → engineering → logistics → installation

before comparing suppliers.

As an early 2026 market reference, stick-built systems are often quoted below unitized systems on a £/m² basis, but a cheaper headline figure can hide a different technical scope.

For England, also check the applicable 2026 Approved Document L requirements rather than using an old generic thermal target. The current guidance lists 1.6 W/m²K for curtain walling in the relevant non-domestic table.

The best curtain-wall budget is therefore not the lowest number.

It is the quotation that meets the same performance, material, testing and installation scope as the competing bids.

Request a Curtain Wall Budget Review

Send Starveil your:

• Elevation drawings
• Façade area
• Glass specification
• Building height
• Wind information
• Thermal target
• Finish requirements
• Installation location

Our engineering team can build the curtain wall cost per m2 from the actual system requirements and provide a project-specific aluminum façade quotation.

Request a Curtain Wall Budget Review →