How to Value a Pre-Seed Startup
2026 Guide for UK Founders
Pre-revenue startups are hard to value. Here's a practical breakdown of the four methods UK angels actually use, what pushes your number up or down, and a dilution calculator so you know exactly what you're giving away.
Why Startup Valuation Is So Hard Pre-Revenue
Valuing a pre-revenue startup is fundamentally different from valuing a business with cash flow. You can't use a revenue multiple, EBITDA multiple, or discounted cash flow in any meaningful sense — there's nothing to multiply or discount. What you're really pricing is the option to capture a large future outcome, balanced against a high probability of failure.
In the UK, pre-seed valuations are negotiated, not calculated. There is no formula that spits out the right number. The methods below are frameworks for anchoring a conversation — not scientific answers. Your valuation will ultimately be set by what an informed investor agrees to pay, which means the best way to raise your valuation is to raise your leverage: more traction, more competing term sheets, stronger team.
That said, founders who understand valuation mechanics negotiate better deals, avoid giving away too much equity early, and set expectations that don't blow up their next round.
The Four Valuation Methods UK Angels Use
Scorecard Method
Bill Payne / UKBAA adaptationHow it works: Start with a regional benchmark pre-money (e.g. £1.5M for UK pre-seed). Adjust up or down using weighted factors: team strength, opportunity size, product/technology, competitive environment, marketing/sales channels, and need for additional investment.
Best for: Any pre-revenue startup. Most widely used by UK angels.
Weakness: Benchmark data is sparse; different angels use different baselines.
Berkus Method
Dave Berkus (US angel)How it works: Assigns up to £500K of value to five risk-reducing factors: sound idea (£500K), working prototype (£500K), quality management team (£500K), strategic relationships (£500K), and product rollout or sales (£500K). Max implied valuation: £2.5M.
Best for: Very early stage — idea or prototype phase, no revenue.
Weakness: Fixed ceiling of £2.5M may be too low for capital-intensive or deep tech plays.
VC Method (Backwards from Exit)
Bill Sahlman, Harvard Business SchoolHow it works: Project your company's value at exit (typically 5–7 years). Apply a discount rate (VCs use 40–70% for seed). Work back to today: Post-money = Exit Value ÷ (1 + discount rate)^years. Subtract the raise to get pre-money.
Best for: Startups with a clear, large exit thesis. Useful when pitching VCs.
Weakness: Highly sensitive to exit assumptions. Angels rarely use it in isolation.
Comparable Transactions
Standard M&A practice adapted for early-stageHow it works: Research what similar UK startups (same sector, stage, and traction level) have raised at. Crunchbase, Beauhurst, and BackerIQ SH01 data can show recent seed rounds. Use these as anchors for your own range.
Best for: Founders who can point to 3–5 comparable raises in the same sector.
Weakness: Comparable data at pre-seed is thin. Many UK raises are not publicly disclosed.
What Pushes Your Valuation Up or Down
Pushes value UP
- +Serial founders with at least one exit
- +Proprietary technology or defensible IP
- +Early revenue or strong letters of intent
- +Large and fast-growing addressable market (£500M+)
- +Strategic partnerships or distribution locked in
- +SEIS/EIS advance assurance confirmed
Pushes value DOWN
- −First-time founders with no relevant domain experience
- −No IP or easily replicable product
- −Crowded market with well-funded incumbents
- −Revenue model still unproven
- −Single founder with no co-founder or key hires
- −No SEIS/EIS advance assurance
Dilution Calculator: Raising £250K at Different Valuations
How much equity you sell depends on your pre-money valuation. This table shows the maths for a typical SEIS raise.
| Pre-money valuation | Amount raised | Post-money valuation | Investor dilution | Founder retained |
|---|---|---|---|---|
| £500K | £250K | £750K | 33.3% | 66.7% |
| £750K | £250K | £1M | 25.0% | 75.0% |
| £1M | £250K | £1.25M | 20.0% | 80.0% |
| £1.5M | £250K | £1.75M | 14.3% | 85.7% |
| £2M | £250K | £2.25M | 11.1% | 88.9% |
| £3M | £250K | £3.25M | 7.7% | 92.3% |
Note: This assumes a single investor and no ESOP or previous dilution. Real cap tables are more complex. Founder retained % is of the total post-money equity, not adjusting for existing shareholders.
UK Pre-Seed Valuation Ranges (2026)
Based on publicly disclosed UK raises (Beauhurst, Crunchbase) and SH01 filing patterns in BackerIQ's dataset, here are the typical pre-money ranges for UK pre-seed rounds in 2026:
| Stage / Profile | Typical pre-money range |
|---|---|
| First-time founder, idea stage | £500K – £1M |
| Prototype / beta, some users | £750K – £1.5M |
| Early revenue (<£10K MRR) | £1M – £2M |
| Serial founder with exit history | £1.5M – £3M |
| Deep tech / AI, strong IP | £2M – £5M |
These are medians, not rules. A first-time founder with genuine traction and multiple term sheets can command £2M+. A serial founder with no product and a declining market might struggle at £1M. The best way to anchor your valuation is with competing investor interest — nothing validates a number like another investor offering the same terms.
Frequently asked questions
What is a typical pre-seed valuation in the UK?
UK pre-seed valuations typically range from £500K to £2M pre-money. The median SEIS raise is around £150K–£250K, usually at a £1M–£1.5M pre-money valuation. Founders with a previous exit or strong traction can command £2M–£3M pre-money. London-based deeptech or AI plays sometimes push £3M–£5M, though this is the exception rather than the rule.
Do I need a formal valuation to raise from angels?
No. Angel investments are negotiated, not formally appraised. You set an asking valuation, angels either accept it, counter, or walk. Most UK angels will not commission an independent valuation at pre-seed. What matters is whether the valuation is defensible given your traction, team, and market — and whether it leaves enough equity for future rounds. If you raise at too high a valuation and can't hit the milestones, your Series A may come as a down round.
Should I use a convertible note to avoid setting a valuation?
Convertible notes and Advance Subscription Agreements (ASAs) are popular in the UK precisely because they defer valuation. Instead of setting a price now, you agree that the loan converts to equity at the next priced round — usually at a discount (e.g. 20%) or with a valuation cap. This is common when you have momentum but don't want to anchor too early. However, HMRC's SEIS/EIS rules require that shares be issued at the point of investment, so ASAs are structured differently from US-style convertibles. See our guide on ASAs vs convertible notes for more.
How does valuation affect SEIS eligibility?
SEIS eligibility is based on gross assets (must be under £350K before the investment) and company age (must be within 3 years of first commercial sale). Valuation doesn't directly affect eligibility, but it affects how much SEIS relief each investor can claim. The SEIS investment limit is £250K per company. If you raise at a £2M pre-money valuation and raise £250K, investors own 11.1% — they can still claim 50% SEIS income tax relief on the full £250K invested.
What's the difference between pre-money and post-money valuation?
Pre-money valuation is what your company is worth before the investment. Post-money is pre-money plus the amount raised. If an investor puts in £250K at a £1M pre-money valuation, the post-money valuation is £1.25M, and the investor owns 20% (£250K ÷ £1.25M). Always be clear which figure you're quoting — misunderstandings here are one of the most common sources of early-stage deal friction.
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