Last updated: September 2026
Contractors and subcontractors don't all play the same buying role. A head contractor holds the head contract and runs the cost, program and trade packages. A specialist subcontractor often prices, designs, procures and installs a whole package. A distributor may fulfil the order, and an installer has a big say in what's practical on site. Selling to them well means knowing who specifies, who approves, who places the order and who fits it on each project, then supporting all of them through to a compliant installation. This guide covers how that works, and what to test when you hire for it.
Who counts as a contractor or subcontractor?
The words get used loosely. They cover parties who do very different jobs.
Head or main contractors
The business that holds the head contract and runs the program. What risk it actually carries depends on the contract. It coordinates the trade packages and manages procurement across them. It may buy some products directly, but a lot of product orders actually sit inside subcontract packages rather than with the head contractor.
Specialist or design-and-construct subcontractors
The businesses that price, and often design, procure and install a defined package. Facade, waterproofing, fire protection, electrical, mechanical, flooring and fitout are the usual examples. Their influence can start well before installation. On a design-and-construct package they often carry defined design responsibility. On early contractor involvement they get in early, but who owns the design still comes down to the contract. Either way, they're not just installers at the end of the line.
Trade contractors, applicators and installers
The businesses and people who do the work on site. They may buy the product directly, buy it through a merchant, or install something someone else selected. Familiarity, labour productivity, training and technical support weigh heavily on what they prefer, and on what they push back on.
Where merchants and distributors fit
A merchant, wholesaler or distributor often fulfils the order and extends the credit, but it isn't a contractor. It's usually the purchase route rather than the party choosing the product. It can still be the buyer and the reseller on paper. Plenty of contractor and subbie orders go through one.
Who actually chooses and buys the product?
This is the part most people get wrong. The party that selects the product, the party that approves it, the party that places the order, the party that gets the invoice and the party that installs it can all be different organisations. A salesperson who can't map that on a given project tends to chase the most visible contact and miss the person who can actually move the order.
| Party | Role in the product decision | Usually places the order? | What the salesperson must understand |
|---|---|---|---|
| Client, developer or asset owner | Sets the brief, budget, standards and approval requirements | Sometimes | The business case, the risk, the whole-of-life priorities |
| Architect, engineer or consultant | Specifies, designs, validates or reviews alternatives | Rarely | Performance, compliance and documentation |
| Head or main contractor | Runs cost, program, package risk and subcontract procurement | Sometimes | Commercial risk, supply capacity, project requirements |
| Specialist or D&C subcontractor | Prices, proposes, procures and installs a trade package | Often | Installed cost, labour, warranty, technical support |
| Trade contractor or installer | Uses or installs the product, may recommend a preferred system | Sometimes | Availability, training, productivity, site support |
| Merchant, wholesaler or distributor | Supplies stock, credit, logistics and fulfilment | Often, as the reseller | Availability, terms, branch coverage, channel margin |
The Building Products Decision Chain
I map every building products sale against one framework. Call it the Building Products Decision Chain:
Need → Influence → Specify → Approve → Fund → Price → Purchase → Install → Operate → Replace
It's a simplified path, not a strictly linear process. Stages overlap, repeat or swap order depending on the product, the project and the procurement model. Contractors and subcontractors are usually most visible at pricing, procurement and installation, and sometimes at approval. Some come in much earlier, through design-and-construct work, early contractor involvement, system design or an alternative proposed at tender. The point is that a product can be won at the design table and still lost later, so a contractor-facing rep has to work more than one stage.
What affects contractor product decisions?
Contractors don't simply buy the cheapest product. In my experience they buy the mix of price, labour, availability, risk and support that gives them the best chance of delivering their package profitably, without defects, delays or callbacks.
On any given order, the things in play usually include total installed cost rather than unit price, availability and lead time, labour productivity and ease of installation, program certainty, compliance and evidence of suitability, warranty and defect risk, technical support and site response, supplier capacity, credit and commercial terms, crew familiarity, and whether the client, consultant or head contractor has to sign off. Which of those dominates changes by product, trade and project. A rep who leads with price on every job is reading half the decision.
Can contractors substitute a specified product?
Not freely, and it's worth being precise about this. A contractor or subcontractor can propose an alternative during pricing, value engineering or procurement. Whether it can actually be used depends on the contract, the project specification, consultant and client approvals, the technical evidence, and the compliance requirements that apply where the National Construction Code is in play.
So the salesperson's job isn't only to persuade the contractor. Where a swap is on the table, they often have to support a documented review of the proposed product, with the evidence of suitability the project team or the approving authority will want to see. How specifications get challenged and defended is covered in more depth in specification leakage in building products.
Which sales roles sell to contractors and subcontractors?
More than one. The right one depends on what the business actually needs the role to do, and the guide to building products sales roles maps each role family against the buyers it deals with.
| Sales role | Best fit in the contractor channel |
|---|---|
| Commercial or project BDM | Creates and converts project opportunities across builders, subcontractors and procurement |
| Technical sales rep or sales engineer | Supports complex applications, compliance, design review and site problem-solving |
| Territory or trade sales rep | Builds broad contractor, installer and merchant coverage across an area |
| Account manager | Retains and grows established contractor or distributor accounts |
| Merchant or channel rep | Manages range, branch engagement and trade pull-through |
| Specification manager | Builds early preference and documentation, then works with contractor-facing colleagues to protect it downstream |
The right title depends on whether the business needs early project creation, technical support, direct contractor conversion, repeat-account growth or distribution coverage. The residential versus commercial BDM split and the technical sales role taxonomy help separate which role you actually need.
How do you test contractor-channel credibility?
Contractor relationships can be very person-dependent. Trust in this channel is built through repeated project delivery and sorting out problems on site. But those relationships don't automatically follow a rep to a new employer. The product, the price, the supply model, the credit terms and the new business's reputation all decide whether their previous access is worth anything to you.
So don't value a candidate on the size of their contact book, and don't ask them to hand over customer lists or proprietary data from a current or former employer. Test how the person creates and converts access instead. The evidence worth having is projects they personally opened, trade packages they converted, stakeholders they mapped across a project, revenue or margin they generated, site or supply problems they resolved, and a real example of building access in a new territory or product category from scratch.
A rep who can show that is a far better bet to rebuild a network in your market than one with a fat address book and none of it. The referees are where you test those claims, and how to run reference checks that actually surface something covers the structure.
What should you test when hiring a contractor-facing salesperson?
Seven things, and the size of the contact list isn't one of them.
1. Route-to-market knowledge. Can they identify who specifies, approves, orders, invoices and installs the product on a real project?
2. Project conversion. Can they show an opportunity they personally moved from first contact to order and installation?
3. Commercial understanding. Do they get installed cost, subcontractor margin, credit, lead times and project risk?
4. Trade credibility. Can they talk credibly about application, labour, installation and callbacks?
5. Technical judgement. Do they know when a proposed alternative needs extra evidence or approval, rather than just pushing it?
6. Channel awareness. Do they understand whether the product sells direct, through distribution, or through a mix?
7. Contractor-network building. Can they show how they opened relationships with builders, subbies, installers or merchants in a market where they had no inherited access, without using confidential information or breaching post-employment obligations?
Questions worth asking:
- Walk me through a project where you identified who specified, approved, purchased and installed the product.
- Who actually issued the purchase order, and through which supply route?
- What site, program, supply or compliance issue nearly stopped the order, and how did you deal with it?
- Tell me about a product alternative you proposed or defended. What approvals and evidence did it need?
- Tell me about a territory where you had to build contractor access from scratch.
A weak answer is a list of contractor names. A strong answer shows how the person mapped the package, understood the purchase route, converted the order and supported the product through to installation.
Sources and methodology
The role and hiring observations on this page come from my own work recruiting contractor-facing sales, technical and account management roles across Australian building products, lighting, interiors, civil, building envelope and construction chemicals. They're practitioner observations, not a statistical survey. Anything here about product compliance or project changes should be read alongside the Australian Building Codes Board's guidance on compliance and evidence of suitability, and standard construction procurement guidance on variations and subcontract arrangements. Contractual responsibilities vary by project and contract, so this page isn't legal or procurement advice. Job titles in this market are loose labels, not regulated definitions, so read the scope, not the title.
If you're briefing a role that sells through contractors, subcontractors or the trade channel, I can help you map the route to market, separate real project-conversion evidence from a contact list, and pin down the sales profile the business actually needs. Get in touch.