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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 single reliable number for curtain wall cost per m2 because a curtain wall is an engineered façade system rather than a standard commodity product.

The final UK price can change significantly with:

• Glass specification
• Stick-built or unitized construction
• Mullion and transom requirements
• Thermal performance
• Finish
• Fire and spandrel detailing
• Engineering and testing
• Site access
• Installation scope

Current 2026 UK market references show a broad range. One recent UK source places standard stick-built curtain walling at approximately £450–£750/m² supplied and installed, while unitized systems are around £650–£1,000+/m². Another supplier publishes indicative ranges of roughly £350–£650/m² for stick-built and £500–£900/m² for unitized. These should be treated as early budgeting references rather than tender prices because project scope and specification can materially change the final figure.

Key principle: define the technical specification and scope first. Then compare the £/m² price.

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Quick Cost Comparison

The original article correctly identified glass, system type, finish and mullion depth as the primary cost drivers. The stronger budgeting model is to treat those four as the core material/system drivers and then add engineering, logistics and installation as project-scope variables.

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1. Glass Is Usually One of the Biggest Cost Drivers

Glass covers most of the façade area, so changes to the glazing specification can move the overall curtain-wall budget quickly.

The main variables are:

• Glass thickness
• Double or triple glazing
• Low-E coating
• Solar-control coating
• Laminated glass
• Acoustic configuration
• Gas fill
• Spacer
• Oversized units

A quotation for standard double glazing should not be compared directly with one using a high-performance solar-control or acoustic IGU.

Glass Cost Decision Table

When requesting a quotation, define the complete build-up:

pane thickness + cavity + coating + gas + spacer + laminate where required.

Do not simply specify:

“Double Low-E glass.”

For a useful price comparison, the supplier needs to know exactly what glass is being priced.

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2. Stick-Built vs Unitized Changes the Cost Structure

The choice between stick-built and unitized construction affects where the project spends its money.

Stick-Built

Individual mullions, transoms and glazing components are assembled on site.

This can provide:

• Greater site flexibility
• Easier adjustment
• Lower factory assembly complexity
• Good suitability for irregular façades

But it usually means more:

• Site labour
• Site assembly
• Installation time

Unitized

Larger panels are substantially assembled and glazed in the factory before delivery.

This can provide:

• Higher factory control
• Faster site erection
• Strong suitability for repetitive high-rise façades
• Less site assembly

But can increase:

• Factory tooling
• Panel transport
• Lifting requirements
• Logistics planning
• Sensitivity to building tolerances

Recent UK cost references generally place unitized systems above stick-built on a headline £/m² basis, but the gap depends on the project’s labour, access and programme.

Our Unitized vs Stick-Built Curtain Wall Guide goes deeper into the technical and installation trade-off.

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3. Mullion Depth Is a Structural Cost Variable

Mullions are not sized simply by architectural preference.

The required section depends on:

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

A deeper section generally contains more aluminum, which can increase material and fabrication cost.

The correct sequence is:

design wind load → structural calculation → section selection → aluminum quantity → price

not:

cheap profile → price first → engineering later

For UK projects, BS EN 13830:2015+A1:2020 is the current BSI-listed product standard for curtain walling. BSI states that it applies to the curtain-wall kit as a whole, including fixings, and covers performance characteristics including weather resistance, safety and energy-related performance.

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4. Finish Affects Both Initial and Lifecycle Cost

The frame finish can range from a standard architectural coating to a project-specific higher-performance system.

Instead of asking for:

“Premium finish”

define:

The original draft compared standard polyester with AAMA 2605 fluoropolymer. For a UK article, it is better not to imply that AAMA 2605 is the universal UK finish requirement. The project specification should identify the actual coating system and environmental exposure.

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5. Installation and Access Can Change the Budget Dramatically

This is one of the biggest reasons two apparently similar curtain-wall quotations can have very different prices.

A supply-only quote might include:

profiles + glazing + fabrication

while another package includes:

engineering + delivery + lifting + installation + testing + site supervision

They are not comparable.

Scope Comparison

Access also matters.

A high-rise façade may require:

• Crane / hoist
• Mast climber
• Scaffolding
• BMU access
• Restricted delivery windows
• Additional site protection

So the useful question is not:

“What is the curtain wall cost per m2?”

but:

“What does the £/m² include?”

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6. Thermal, Solar and Fire Requirements Add Specification Cost

A curtain wall is part of the building envelope.

For England, the 2026 Approved Document L, Volume 2 is the current guidance for buildings other than dwellings.

The actual façade solution may require:

• Thermally improved framing
• Higher-performance IGUs
• Solar-control Low-E
• Warm-edge spacers
• Insulated spandrels
• Thermal interface details
• Energy calculations

Fire requirements can also add cost through:

• Spandrel assemblies
• Fire stopping
• Slab-edge protection
• Compartmentation interfaces

BSI currently lists BS EN 15254-6:2014 for extended application of fire-resistance test results relating to curtain walling. It covers variations associated with curtain-wall configurations tested under the relevant fire-test standards.

So a “£/m² curtain wall price” without a stated fire-stopping and spandrel scope can be misleading.

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

A professionally specified curtain wall may require much more than aluminum and glass.

Consider:

• Shop drawings
• Structural calculations
• Thermal calculations
• Performance testing
• Mock-ups
• Material samples
• Installation details
• QA documentation
• Handover records

For example, BSI lists BS EN 12153:2023 as the current curtain-wall air-permeability test method, while BS EN 12152:2023 provides air-permeability requirements and classification.

This means testing should be treated as part of the technical procurement scope rather than an optional extra that appears at the end.

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What Is the Real Cost Structure?

A more useful budgeting model is:

Glass + aluminum framing + finish + accessories + engineering + logistics + installation + testing

This is the difference between an indicative price and a project budget.

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UK Curtain Wall Cost per m2: 2026 Reference Range

Publicly available UK pricing references currently show a broad market spread.

These figures combine current published UK industry references and should be used only for early-stage budgeting rather than tender comparison. Public supplier guidance gives different ranges depending on assumptions and scope.

A final quotation can move substantially because of:

glass + system + mullion + finish + engineering + access + installation + project complexity.

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How to Build a Curtain Wall Budget

Use this sequence before contacting suppliers:

This sequence avoids the common mistake of choosing a budget before defining the façade.

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How to Compare Curtain Wall Quotes

Never compare only the total or the £/m² rate.

Use a common technical schedule.

A lower £/m² number may simply exclude:

• Installation
• Engineering
• Fire stopping
• Higher-performance glass
• Testing
• Premium finish
• Logistics

Compare scope first. Compare price second.

For Starveil quotations, provide the drawings and technical information required for an aluminum façade quotation.

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What Should You Send for a Preliminary Budget?

To receive a useful curtain-wall budget, prepare:

• Elevation drawings
• Typical wall sections
• Total façade area
• Floor heights
• Mullion spacing
• Glass requirement
• U-value target
• Solar-control target
• Wind information
• Finish requirement
• Fire / spandrel requirement
• Installation location
• Required scope

For a complex façade, the earlier the manufacturer becomes involved, the easier it is to identify cost drivers before the tender specification is fixed.

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Frequently Asked Questions

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

Current 2026 published UK market references suggest approximately £350–£750/m² for stick-built systems and £500–£1,000+/m² for unitized systems, depending on assumptions and scope. Other industry sources publish narrower or higher ranges. These figures are early budgeting references rather than fixed tender prices.

What drives curtain wall cost?

The main drivers are the glass build-up, stick or unitized construction, mullion design, finish and installation scope. Thermal, fire, engineering, testing and access requirements can also materially increase the final cost.

Is unitized curtain wall more expensive than stick-built?

Usually on the initial factory cost, yes. Unitized systems require more factory assembly, panel handling and logistics, while stick-built systems generally require more site labour. The total project cost depends on the building, schedule, labour market and site conditions.

Does glass type change curtain wall cost?

Yes. Glass thickness, Low-E coating, solar control, laminated construction, acoustic requirements, cavity configuration and oversized IGUs can all affect the price. Two curtain walls with identical frame systems can therefore have significantly different costs.

Does mullion depth affect curtain wall price?

Yes. Mullion depth is influenced by span, wind pressure, spacing, support conditions and allowable deflection. A deeper section generally increases aluminum usage and can increase material and fabrication cost.

Does thermal performance increase curtain wall cost?

Often. Higher thermal targets can require improved frame geometry, thermal breaks, higher-performance glazing, warm-edge spacers and additional calculation. The project target should be established before the supplier prices the system.

Does fire stopping need to be included in the curtain wall budget?

It should be identified separately in the scope. Fire-stopping, spandrel and slab-edge requirements can materially affect the total façade cost, and the applicable solution must be coordinated with the project’s fire strategy and tested assembly.

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. BSI also lists BS EN 12152:2023 for air-permeability requirements and classification and BS EN 12153:2023 for air-permeability testing.

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Bottom Line

Curtain wall cost per m2 is not a fixed market number.

For UK projects, establish the specification in this order:

glass → thermal target → system → mullion → finish → fire/spandrel → engineering → logistics → installation

Then compare suppliers on exactly the same scope.

As a 2026 early-stage market reference, published UK sources currently place many standard stick-built systems in roughly the £350–£750/m² range and unitized systems around £500–£1,000+/m², but project-specific quotations can fall outside these ranges.

The correct purchasing decision is therefore not:

“Who has the lowest £/m²?”

It is:

“Who provides the required façade performance at the lowest comparable total project cost?”

For Starveil, send your elevation drawings, façade area, glass specification, building height, wind information, thermal target and installation location. We can build the curtain-wall specification and budget around the actual project rather than a generic market rate.

Request a Curtain Wall Budget Review →