Last updated: July 2026
If you've made it to an interview, you're already in roughly the top 2% of applicants. Then a decent chunk of that 2% walk in and quietly talk themselves out of the offer.
I sit in an unusual seat here. After every interview I arrange, I get two debriefs: the candidate's version and the client's version. The gap between them is where this post comes from. Candidates almost never know which mistake cost them, because clients rarely say it to their face. They say it to me. These are the seven I hear most, and none of them are about lacking experience.
What is the most common interview mistake in sales interviews?
Not asking questions, or asking only self-interested ones. When two candidates are close on experience, hiring managers in this industry tell me the same thing over and over: the one who asked better questions gets the offer.
You are interviewing for a job where asking sharp questions of strangers IS the work. Turning up without any is like a chef turning up without knives. And "what's the salary review process?" followed by "how much travel is there?" is worse than silence, because both questions are about what the company does for you, not what you'd do for them. I've written a full breakdown of what to ask and what to avoid in The Questions You Ask in an Interview Matter More Than the Ones You Answer. Read it before your next one.
Why is badmouthing your current employer so damaging?
Because the hiring manager hears a preview of how you'll talk about them in three years.
You can be honest about why you're moving without torching anyone. "The company restructured and the role changed underneath me" is honest. "My manager is a micromanaging clown" might also be honest, but the client stops evaluating your sales record and starts evaluating your judgement the moment you say it. Building products is a small industry. There's a fair chance your interviewer knows your manager. I've watched interviews die on exactly that discovery.
Do you need numbers to back up your claims in a sales interview?
Yes. "I grew the territory significantly" is a claim. "I took the territory from $1.8 million to $2.6 million in two years, mostly through getting specified on two major health projects" is evidence. Hiring managers discount claims and remember evidence.
The pattern I see in debriefs: the candidate says they talked through their achievements, the client says "they couldn't put a number on anything." Before any interview, know your revenue, your budget vs actual, your pipeline conversion, which specs you won and what they were worth. If your current employer keeps that data vague, reconstruct your best estimates and say they're estimates. Rough numbers offered honestly beat polished adjectives every time.
How much company research is enough before an interview?
More than you think, because the bar has moved. Fifteen minutes on the company website was fine in 2019. It reads as lazy in 2026, when 20 minutes with an AI tool can brief you on the company's products, projects, competitors, and likely challenges.
In a spec-driven sale, walking in knowing which projects the company has been specified on, who their main competitors are in the channel, and what's changed in their market recently is the minimum for someone claiming commercial curiosity. Candidates who do this properly don't just answer better. They ask better questions, which loops back to mistake number one.
Should you hide short stints and gaps on your CV?
No. Own them before you're asked. The visible flinch when a five-month stint comes up does more damage than the stint itself.
I worked in pubs for ten years before recruitment, and I watched a lot of people get fired. The ones who came back stronger were the ones who could talk honestly about why. Same rule in interviews. "That role was a mis-hire, honestly. The territory they described in the ad didn't exist yet. I stayed five months, realised it wasn't fixable at my level, and moved on. Here's what I check for now." That answer builds trust. A mumbled cover story destroys it, because hiring managers always sense the mumble, and what they can't verify they assume is worse than it is.
The same goes for the failure question. Everyone gets asked about a deal or a year that went wrong. Candidates who can walk through a real failure and what changed afterwards consistently outperform candidates who offer a humblebrag dressed as a weakness.
When should you bring up salary in an interview?
Not in the first interview, unless they raise it. First interviews are for establishing that they want you. Money conversations go much better once that's true.
This is different from being vague when asked. If they ask your expectations, give a straight number or range. The mistake is leading with it, negotiating leave loading before anyone's decided they want you, or letting every question you ask circle back to the package. And if you're working with a recruiter, that's literally what I'm for. I'll have the awkward money conversation on your behalf, with better information about what the client can actually do than you'll ever extract in an interview room.
Do you need to close at the end of a sales interview?
Yes. It's a sales job. If you can't ask for the next step in a room where asking for the next step is the entire point, the client will wonder how you'll go asking a builder for the order.
Nothing slick required. "I'm genuinely interested in this role. What would you need to see from me to be comfortable moving to the next stage?" does the job. It shows intent, it surfaces objections while you can still answer them, and it's exactly the behaviour they're hiring for. The number of debriefs where a client says "good candidate, but I couldn't read whether they actually wanted it" would surprise you. Don't leave the room with your interest ambiguous.
Frequently asked questions
What is the biggest interview mistake sales candidates make?
Not asking good questions. When candidates are close on experience, the one who asks sharper commercial questions almost always gets the offer. In a sales interview your questions are treated as a work sample.
How do I explain a short stint at a company?
Directly and without flinching. Name it before they ask if you can, explain what went wrong in neutral terms, and finish with what you screen for now as a result. Hiring managers respect an honest read on a bad move far more than a cover story.
Should I ask about salary in a first interview?
No, not unless the interviewer raises it. Answer directly if asked, but don't lead with it. First interviews are for building their interest. Negotiation works better once they want you, or through your recruiter if you have one.
How should I prepare for a building products sales interview?
Know your own numbers cold, research the company's products, projects, and competitors, and prepare five questions that prove commercial curiosity. Twenty minutes with an AI research tool now covers what used to take a day.
How do I finish an interview strongly?
Close. Say you're interested and ask what they'd need to see to move you to the next stage. It surfaces any concerns while you're still in the room and demonstrates the exact behaviour a sales role is hiring for.
I'm a specialist recruiter for the building products industry. James Bowesman is based in Melbourne and runs Specified Select.