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Curtain walling and cladding contractor English Architectural Glazing (EAG) was founded in 2000, following 15 years in a different incarnation. The Suffolk-based company now has 140 employees and recorded turnover of 拢17.5m last year. Its turnover this year is expected to hit 拢21m. As well as fitting products on site, it fabricates the aluminium components and collaborates with architects to design and manufacture systems. Edward Whipp, EAG鈥檚 preconstruction director and co-owner, explains the logistical challenges.

Over the past four or five years, we鈥檝e become more and more involved in total envelope cladding, as main contractors have changed methods of procurement. There鈥檚 a lot of work because so many companies have gone into receivership 鈥� in the past couple of years there鈥檚 been 拢125m more work than the British cladding industry could take on.

We manufacture the vast bulk of the cladding and curtain-walling units we send to site and we fabricate all the aluminium components 鈥� aluminium is common to all our jobs. We buy in other components, such as timber, glass, copper and zinc. Our designs, based on architects鈥� preliminary drawings, are developed in-house. We have a 16-strong design team.

At the next stage, an EAG-employed site manager oversees all cladding and curtain-walling installation and takes responsibility for health and safety. We focus on in-house manufacture. For the physical installation we hire a subcontractor, with up to 50 workers, but an EAG quality manager will always inspect the site work at various 鈥渉old points鈥�.

How we win work and when we get involved differs. On some projects, we in the preconstruction team work with the architect at the earliest stage. With main contractors such as Galliford Try, we often work early on, securing people capacity and supply lines.

We鈥檙e always involved at the main contract tender stage, but we also frequently advise main contractors at the early stage of two-stage contracts. Advice might focus on cost plan verifications and issues such as city-centre deliveries.

This early help doesn鈥檛 guarantee our involvement, so we might compete against two or three other subcontractors. At this stage, contractors, who realise that cheapest bids don鈥檛 necessarily lead to the best work, will make recommendations or make the decision themselves. And the client will go into huge detail. It鈥檚 all about apportionment of risk.

The level of specification also varies. It can be detailed but often is quite loose, meaning we can help develop the overall design, typically over a 12-week period. Either way, the design always needs modification for engineering load considerations.

We鈥檝e been involved in a number of high-profile jobs recently, such as aluminium curtain walling for Wimbledon鈥檚 Centre Court and the glass-based curtain walling of the Jennie Lee 黑洞社区 at the Open University in Milton Keynes. Our largest job was for the redevelopment of High Wycombe town centre. The total project value was 拢260m, with 拢9m going to us. One of our most technically challenging jobs was for the 拢28m Westminster academy. Our contract was for 拢2.6m and we worked with 17,000m2 of glass, 2,400m2 of terracotta tiles and 1,000m2 of soffit cladding.

The single piece of advice I鈥檇 give? Secure your supply chain. It鈥檚 absolutely paramount.