How To Choose A Curtain Walling Sub-Contractor

When it comes to modern construction methodologies, curtain walling plays a pivotal role in defining the visual appeal, energy efficiency, and thermal performance of a building. For estimators tasked with producing compliant, competitive tenders, selecting a credible and experienced curtain walling sub-contractor is not just a matter of budget; it's integral to ensuring project success and compliance with industry standards.

This quick guide highlights the considerations and the questions you should ask when selecting the right curtain wall sub-contractor for your next façade or glazing project.

What Is Curtain Walling And Why Does It Matter?

​Curtain walling is a non-structural external façade system designed to keep weather out while allowing natural light in. Typically built using aluminium frameworks combined with glass, cladding, or composite materials, curtain walls enhance both the appearance and performance of a building.

​Beyond their aesthetics, these systems deliver measurable benefits:

1. Thermal efficiency: reducing energy consumption and supporting compliance with Part L of the Building Regulations.
2. Acoustic performance: improving comfort in schools, hospitals, and offices.
3. Fire and safety integrity: ensuring compliance with BS EN 13830, BS 9999, and related façade fire performance standards.
4. Daylight optimisation: balancing light transmission with solar control for energy-efficient design.

As such, they are a regular feature of commercial buildings, universities, and other buildings where design, performance, and regulatory compliance must align seamlessly.

What Roles Do Sub-Contractors Play In Curtain Walls?

Curtain walling sub-contractors are essential partners who bring technical, fabrication, and compliance expertise to a project. Their responsibilities go beyond installation. Their role often includes:

1. Design input and technical interpretation of architectural and structural drawings.
2. Fabrication and installation of complex façade systems, integrating glazing, cladding, and structural fixings.
3. Ensuring full compliance with fire, acoustic, and security standards (e.g. PAS 24, BS EN 13830).
4. Quality control and site coordination, ensuring interfaces with other envelope systems are managed effectively.

A strong sub-contractor will add value through proactive design collaboration, early risk identification, and practical, buildable solutions. They help main contractors deliver façade packages that meet technical specifications while remaining commercially viable

How Should I Select The Best Curtain Walling Sub-Contractor?

A capable and trustworthy sub-contractor will have the perfect combination of technical expertise, project management capabilities, and commitment to safety and compliance. It’s about verifying competence, track record, and alignment with your programme and risk profile. Look for:

1. Multi-disciplinary experience across glazing, cladding, and façades.
2. Proven ability to interpret technical drawings and manage interfacing trades.
3. Knowledge of building regulations, fire strategy, and thermal performance standards.
4. Demonstrated capacity to deliver on programme and budget, without compromising quality.

Lots of people claim to be able to do all this, but how can you know for sure? Here are the questions to ask!

1. Have you worked on projects that required both cladding and glazing expertise?
2. Can you provide examples of past projects similar to ours?
3. How do you coordinate materials, systems, and interface trades?
4. Can you provide examples of overcoming technical challenges in previous projects?
5. Are your team members trained and certified in the latest installation techniques?
6. How do you ensure compliance with fire safety standards and façade performance standards?
7. What processes do you use to align with health and safety regulations on-site?
8. How do you handle unexpected technical issues during the installation process?
9. What methods do you use for regular communication and progress updates?
10. What steps do you take to ensure projects are delivered on schedule?
11. Can you provide references from your previous projects?

If you’re not sure, you can ask around and find recommended contractors. Word of mouth goes a long way and is usually reliable. Equally, chatting on the phone can give you a good idea of whether their team is right for your project.

What Next?

At Advanced Glass, we bring decades of experience in delivering advanced curtain walling solutions. With a track record of excellence in cladding and glazing, our team is ready to ensure your project meets the highest industry standards. Discuss your project needs with us today by calling 01455 241844, and let's work together to deliver exceptional results for your customers.

​Image source: Canva