Insights from the Industry Disruptors podcast

Behind the Curtain: The Real Mortgage Underwriting Process.

Episode 2

A brutally honest look at mortgage underwriting, what really happens behind the scenes, and how borrowers and advisers can navigate the chaos.

Getting a mortgage might seem like a straightforward process. Submit a few documents, get your credit checked, and wait for an approval. Simple, right? Not quite. Behind the scenes, there’s a whole world of confusion, delays, and eyebrow-raising decisions being made by underwriters. In this post, based on Season 2, Episode 2 of Industry Disruptors, we pull back the curtain on the mortgage underwriting process with Charlotte Grahame, qualified adviser and Hearthstone team member.

What Is the Mortgage Underwriting Process?

Mortgage underwriting is where the magic (and madness) happens. It’s the process lenders use to assess the risk of lending to a borrower. Underwriters analyse your income, credit, outgoings, property details, and a whole stack of documents to decide whether you’re a safe bet.

They’re not just ticking boxes. They’re digging into the fine print, looking for anything that could cause a deal to go sideways. And sometimes, their decisions leave even experienced brokers scratching their heads.

What Mortgage Clients Don’t See (But Should Know)

From a borrower’s perspective, things often feel like they’ve gone silent after an application is submitted. But behind the scenes, the underwriter might be:

  • Reviewing line-by-line transactions on your bank statements
  • Questioning why your payslip says “Michael” when your ID says “Mike”
  • Asking for documentation that’s already been sent

Documents must be complete, accurate, and in the right format. No screenshots. No cropped images. No excuses. Advisers ask for things because lenders need them. It’s not optional.

The Most Common Underwriting Frustrations (Real-Life Stories)

Charlotte and the team deal with underwriters daily. The frustration? It’s real. Some lowlights:

  • Lenders requesting payment evidence for a Freeholder who paid themselves
  • Underwriters asking one question at a time, over a week, instead of just requesting everything at once
  • Clients sending in photos of a closed passport, or bank statements with half the details missing

Each silly delay adds days, sometimes weeks, to your mortgage application.

How Poor Underwriting Delays Can Derail Deals

A delayed deal can cost you the property, your deposit, or your sanity.

  • Waiting 5+ days for a reply to a simple document
  • Notes added to a case being ignored by underwriters
  • Cases being handed from person to person with zero continuity

In one case, Hearthstone submitted a complete application, but a lender sat on it for a full month without action. And when chased? “Oh, sorry, we missed it.”

Why Trusting Your Mortgage Adviser Matters

Your adviser isn’t just a middleman. They are your defender, your translator, and your project manager.

They know what underwriters need, even before they ask. They chase relentlessly. They write cover notes explaining why your one-time mobile bill missed in 2018 shouldn’t cost you a mortgage today.

But they can only do that if you trust them.

  • Don’t question every document request
  • Don’t send WhatsApp screenshots instead of PDFs
  • Don’t ghost them for two weeks and expect magic to happen

The Good, the Bad, and the (Actually) Helpful Lenders

Not all lenders are a nightmare. Some get it. A few are even good:

  • Accord Mortgages: Quick, clear, and consistent.
  • LendInvest: Friendly underwriters who pick up the phone.
  • Sentry: Efficient, responsive, and proactive.

But many others? They’re in the dark ages, insisting on paperwork that doesn’t exist or getting spooked by leaseholds, titles, or even the shape of the building.

Tips for Navigating the Underwriting Process Like a Pro

Want to avoid delays and hair-pulling?

  • Send PDF documents only. No screenshots, cropped images, or messy scans.
  • Fill out your client portal in full. It’s not optional.
  • Respond quickly to your adviser. Don’t sit on a document for days.
  • Be honest upfront. Hidden issues always come back to bite.
  • Don’t argue with your adviser. They’re not making this up — they’re trying to help you.

What This All Comes Down To

Underwriting shouldn’t be this hard. But it is. And unless something changes across the industry, it’s not getting easier anytime soon.

That’s why who you work with matters. A great adviser isn’t just filling in forms — they’re constantly translating chaos into clarity. They’re chasing lenders, pushing back on pointless delays, and protecting your deal at every step.

So if your adviser tells you they need something, don’t push back. Don’t delay. Just send it — and let them do what they do best.

Need a Mortgage Without the Mayhem?

If you want a broker who fights for your deal like it’s their own, get in touch with Hearthstone. We deal with the stress so you don’t have to.

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This article was produced by the team at Hearthstone Mortgages, led by Ajay Nayyar (CeMAP), Founder and Managing Director, and Jordanne Whiley MBE (CeMAP, CeRER, PhD), Office Manager and Senior Adviser. With deep expertise in specialist lending and a client-first approach, Hearthstone is dedicated to helping property investors and homebuyers make smart, informed decisions.

Learn more about the Hearthstone team.

Industry Disruptors Podcast

Podcast Hosts

Ajay is the Founder and Managing Director of The Hearthstone Group and established Hearthstone Mortgages in 2019 after excelling in the UK mortgage advisory space. He is an expert in mortgages, bridging loans, and protection, with a personal property portfolio and extensive speaking experience at investor and lender panels. Driven by a passion for empowering clients, Ajay continues to expand the Hearthstone brand, delivering invaluable knowledge. Outside of work, he is an award-winning actor and producer with over 20 projects to his name.
Jordanne is the Office Manager and Senior Adviser at Hearthstone Mortgages. An award-winning expert in mortgages, equity release, commercial property, bridging, development finance, protection, and will writing, Jordanne's dedication to helping clients achieve their dreams is unparalleled, reflected in her glowing reviews. Beyond her advisory role, Jordanne is a 4x Paralympic medalist and 13x Grand Slam tennis champion, bringing her Olympic-level ambition to Hearthstone's daily operations.

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