1. Choosing on price, not on process

A £2,000 sourcing fee looks like the obvious choice next to a £5,000 one. It rarely is.

The fee isn't the product. The product is the work behind the deal: the comparable sales analysis, the verified rental evidence, the costed refurbishment schedule, the planning and tenure checks, the modelled exit. A cheap fee often means a thin deal pack — two pages of optimistic numbers with very little underneath them. And an optimistic number you didn't stress-test is the most expensive thing you can buy.

Do this instead. Ask to see a full deal pack before you commit to anything. Look for the workings shown, not just the headline yield: comparables included, refurb costed line by line, exit strategy modelled across more than one scenario. Judged against a properly sourced deal, the difference between a £2k and a £5k fee is a rounding error.

2. Being vague about your criteria

"Send me anything that stacks" is not a brief. It feels open-minded, but in practice it forces the sourcer to guess — and guessing wastes both your time and theirs.

A sourcer who doesn't know your budget, your strategy, your target areas and your appetite for risk cannot filter properly. You'll receive deals that were never right for you, lose confidence in the ones that are, and slowly conclude that sourcing "doesn't work" — when the real problem was an unclear instruction at the start.

Do this instead. Be specific from day one. How much cash you have available, whether finance is already in place, your target yield, your preferred areas, whether you're after buy-to-let, HMO or buy-refurbish-refinance, and how hands-on you want to be. The tighter the brief, the better the deals that come back. A good sourcer will push you to be precise; that's a feature, not a nuisance.

3. Skipping your own due diligence

This is the one even experienced investors get wrong, usually because the deal pack is good. A strong pack is reassuring, and reassurance makes people relax.

But a sourcer does the heavy lifting — they don't carry the risk. It is still your money going in and your name going on the title. Taking any deal pack entirely at face value, however polished, is how small errors slip through to completion.

Do this instead. Verify the headline numbers yourself. Sense-check the comparables against your own knowledge of the area. Look at the live rental evidence. Pressure-test the refurbishment budget against what your own trades would quote. None of this is a sign of distrust, and a confident sourcer will welcome it — if anything, an investor who checks the numbers is easier to work with, because the deals that survive that scrutiny are the ones everyone can move on quickly.

4. Not checking they're actually compliant

Deal sourcing is a regulated activity, and a meaningful number of people offering it do not hold the cover they are legally required to have. If something goes wrong with an unregistered sourcer, you may have no protection and no recourse at all.

This isn't an exotic risk. It's the most basic box to tick, and it's the one most often skipped — usually because the deal looks exciting and the paperwork feels like a formality.

Do this instead. Before you pay anything, confirm three things in writing: membership of a redress scheme, professional indemnity insurance, and registration for anti-money-laundering supervision. A legitimate sourcer will have all three to hand and won't be remotely offended that you asked. If those questions are met with hesitation, you have your answer.

5. Treating it as a one-off transaction

It's tempting to think of sourcing deal by deal: a fee paid, a property delivered, relationship complete. The investors who get the most out of sourcing think about it very differently.

The first deal is really a trial. It's where you each learn how the other works — how you make decisions, how quickly you move, what you actually mean when you say a deal "fits." The value compounds across the next several deals, once that understanding is in place. Start over with a new sourcer each time and you reset that learning curve every single deal.

Do this instead. Treat a good sourcer as a long-term relationship. Give honest feedback, be straight about what worked and what didn't, and stay in touch between deals. A sourcer who knows your criteria inside out — and trusts that you'll move when the numbers are right — will bring you the right deal first, before it goes to anyone else. That priority access is worth more than any single fee.

The bottom line

None of these five mistakes is dramatic. That's exactly why they're worth flagging — they're quiet, they feel reasonable in the moment, and they tend to be noticed only with hindsight.

Get them right and the maths is straightforward. A sourcer stops being a line item on a single purchase and becomes one of the most valuable relationships in your property business: consistent deal flow, genuine due diligence, and first sight of the deals that never reach the open market.

Acre Estates sources fully-packaged, due-diligenced property deals for investors — buy-to-let, HMO and buy-refurbish-refinance. If you'd like to see what a complete deal pack looks like, with every number's workings shown, get in touch at lawrence@acre-estates.com.