How UK pre-seed valuations are really set (and how to defend yours)
Ask a first-time founder what their company is worth and you tend to get one of two answers. Either a shrug, or a confident number backed by a spreadsheet that discounts imaginary profits from 2031 into today’s money. Both miss what’s actually happening in the room. At pre-seed, valuation is not a measurement of what your company is worth. There’s nothing yet to measure. It’s the price of a deal, and prices get set by demand, dilution and a handful of constraints most founders never see.
I spent my career on the capital side, first across three of the UK’s largest corporate banks moving over £1bn of funding, then advising founders through their raises. So I’ve watched a lot of these numbers get made, from both sides of the table. Here’s how it really happens, and how to walk in with a figure you can actually defend.
Valuation is a price, not a truth
Two words you need first. Pre-money is what the business is valued at before the new money goes in. Post-money is that figure plus the cash you raise. An investor’s stake is simply their cheque divided by the post-money valuation. Put in £150,000 at a £1.5m post-money and you own 10%. That’s the whole equation.
Notice what’s not in it. No one at pre-seed is discounting your cash flows, because there are no cash flows to discount. A discounted cash flow model on a company with no revenue is a daydream in a spreadsheet, and experienced investors treat it as one. They’re not pricing your future profits. They’re pricing the risk of backing you now, and the share of the company they want in return for taking it.
The number is mostly arithmetic
Here’s the part that surprises founders. Investors don’t usually start with your valuation. They start with the percentage they want to own. At pre-seed, most angels and early funds are looking for somewhere between 10% and 20% of the company for leading or filling a round. Fix the amount you’re raising and the ownership they want, and the valuation simply falls out of the sum.
An example. You want to raise £250,000. The investor wants 15%. That implies a post-money of about £1.67m, so a pre-money of roughly £1.42m. Now say they push for 20% instead. Your pre-money drops to £1m. Nothing about your business changed in those two sentences. You didn’t become less valuable. The maths just moved, because the two things that actually drive the number are how much you raise and how much of the company you’re willing to part with. Almost everything else is negotiation around those two levers.
What moves you within the range
So what decides whether an investor asks for 12% or 20%? The same thing that decides most funding questions: how much risk they think they’re taking. Every piece of evidence that lowers that risk nudges the percentage down, which is to say it pushes your valuation up.
A working product beats a wireframe. Early paying customers beat a waitlist. A founder or team who has built and sold something before beats a first-timer with a deck. A market investors already believe in beats one you have to talk them into. None of this is about polish or confidence. It is about whether the story rests on things that have actually happened. Founders who try to win valuation on narrative alone almost always lose it at the first hard question. The ones who move their number do it with proof.
The SEIS envelope quietly sets the ceiling
There’s a very British constraint sitting underneath most first rounds, and it shapes the valuation whether you plan for it or not. The Seed Enterprise Investment Scheme (SEIS) lets qualifying UK companies raise up to £250,000, with investors getting 50% income tax relief on what they put in. To qualify, the company must have been trading for under three years, hold gross assets of no more than £350,000 and have fewer than 25 employees. Each investor can claim relief on up to £200,000 a year, and no SEIS investor can end up holding more than 30% of the company (figures correct as of 10 August 2026, source: British Business Bank).
Why does a tax scheme touch your valuation? Because at pre-seed most UK angels want their cheque to qualify for SEIS, and that quietly shapes the whole round. Your valuation has to leave room for those investors to get a stake that feels worth having, for a cheque small enough to be one person’s allocation, without anyone tipping over that 30% line. Getting advance assurance from HMRC, which is their confirmation that your round looks eligible before anyone invests, makes you far easier to say yes to. This is information rather than tax advice, but it’s exactly the kind of thing worth sorting before you name a figure.
Often you don’t set a number at all
Plenty of UK pre-seed rounds never put a fixed price on the equity. Instead they use an Advance Subscription Agreement (an ASA: money in now, shares issued later at your next priced round) or its US cousin, the SAFE. These defer the valuation to a future round and usually carry a discount, a valuation cap, or both. The cap is the maximum valuation at which that early money is allowed to convert into shares, so it protects the investor if you go on to raise at a much higher price later.
Which means that at pre-seed your valuation is frequently not a price at all. It’s a cap: a ceiling you and your first backers agree on now and test later. One UK-specific warning, because it catches people out. An ASA can be structured to keep SEIS and EIS eligibility, but a standard US SAFE usually can’t, which can quietly cost your investors their tax relief. That trap deserves its own post, and it will get one.
The comparables trap and the AI premium
The last thing founders anchor on is what similar companies raised at. That’s reasonable, but mind two things. First, the headline numbers you read are skewed upward, because the companies that raise at punchy valuations get written about and the flat rounds quietly don’t. You’re reading a highlight reel and mistaking it for the average. Second, sector is currently doing more work than stage. Anything wearing an AI label is commanding a premium the rest of the market simply isn’t seeing, so a comparable from outside your space can mislead you badly.
For a sense of scale, the median UK seed pre-money valuation, one stage above you, sat in the region of £5m to £6m in the most recent British Business Bank data (Small Business Equity Tracker 2025). Pre-seed sits well below that, and honest pre-seed data is genuinely thin, so treat any single number you’re quoted as directional rather than a target to hit.
A high valuation isn’t a free win
It’s tempting to treat valuation as a scoreboard and push for the biggest number you can get. Investors read it the opposite way: as a hurdle you now have to clear. Price the round too high and you set a bar your next raise has to jump, and if you can’t, you’re looking at a down round (raising later at a lower valuation than before), which is bruising to your ownership and reads as a warning sign to everyone at the table. A sensible valuation you can comfortably grow past is worth far more than a heroic one you then spend two years trying to justify.
How to walk in with a number you can defend
Work backwards, in this order. Start with the milestone: what’s the specific proof point that unlocks your next round, and how much money does reaching it actually take? That sets the amount you raise, not a vague 18 months of runway. Then decide the most dilution you’re willing to accept, and as a rule of thumb try not to give away much more than 20% to 25% at pre-seed, because you need equity left for the rounds after this one. Those two decisions give you a valuation range, not a single point.
Bring the comparables that support the top of that range and the evidence that earns it. Then hold the range lightly. The final number is the outcome of a negotiation, not a hill to die on, and the founders who do best are the ones who understand the maths well enough to move within it without losing the room.
Know where you actually stand first
Before you go anywhere near a number, it helps to know how an investor would score you today. That’s what the Launchology Funding Readiness Assessment is for. It looks at your evidence, your team and your traction the way the person writing the cheque will, and tells you honestly where you stand and what to fix before you start talking valuation. Set your number from that position, not from a spreadsheet daydream. Take the Funding Readiness Assessment.