How a valuer decides what your split units are worth

I get asked about finance more than anything else, but valuation is the question people should be asking first. Your funding, your deposit, your exit and whether the deal works at all are all downstream of what a valuer writes down. Get the valuation wrong in your model and every other number in your spreadsheet is fiction.

The same building, two completely different values

This is the bit that unlocks the whole strategy, so read it twice.

A block of flats under one title is usually valued as an investment. A valuer looks at the rent it produces and applies a yield. That is it. The building is a machine that generates income, and the value is a multiple of that income.

The same building, split into individual titles, gets valued on a bricks-and-mortar basis instead. Each flat is now a thing an ordinary person could buy and live in, so it is valued against what similar flats nearby have actually sold for.

The split is what converts one into the other. You have not laid a brick. You have changed what the building legally is, and in doing so you have moved it from the investment market into the owner-occupier market, which almost always pays more per square foot. That gap is the entire opportunity.

The aggregate valuation, and why it is the only number that counts

Add up what each individual unit is worth and you have the aggregate valuation. That is the figure a lender lends against, typically at around 75% loan to value.

So the arithmetic that decides whether a deal stacks is not "what is the block worth" against "what am I paying". It is: what is the aggregate value of the split units, what percentage of that will a lender advance, and is that advance enough to cover the block purchase price plus the frictional costs of doing the split. What you are really hunting for is a big enough discount off the block value to make that work.

What makes a comparable actually stand up

Comparables are the evidence. A valuer is not interested in your opinion, and frankly nor am I. They want sold prices for similar properties nearby, recently.

The gold standard, and what I aim for every time:

Sold, not asking. Asking prices prove nothing. Somebody has to have actually paid it.
Within a quarter of a mile. Closer is better.
Within the last six months. Older than that and the market has moved.
Full address, price and date on every single one, so it can be checked.

Then sense-check every one of them before you put it in front of anybody. Filter by radius AND by square metreage, because a "comparable" that turns out to be a house rather than a flat will get spotted, and once one of your comparables falls over the valuer stops trusting the rest of them.

Do not cherry-pick the top of the range either. On a 62 square metre one-bed I worked through recently the honest comparables ran from £65,000 up to £135,000, and the £65,000 one was an unrefurbished flat that later resold for considerably more after works. The defensible answer was somewhere around £115,000 to £122,000, not £135,000. Put £135,000 in your model and you have built a deal on your best day rather than a likely one.

Four traps that kill otherwise good blocks

1. Flats that are individually too cheap

Most lenders want to see a minimum value per flat, and around £75,000 is a common threshold. A block of eight flats that each value at £60,000 has a real problem: the aggregate might look fine, but nobody will lend on the units, so the deal gets pushed into bridging, and bridging may well make it unviable. Check the per-unit figure, not just the total.

2. Very small units

Flats under about 30 square metres regularly fall below lending minimums. There are workarounds, including leaving the small ones unencumbered and refinancing them later with a specialist, but you need to know before you exchange, not after.

3. Assuming the parking and gardens add value

Land only adds mortgageable value if it is demised with the individual unit. A parking space or a ground-floor garden attached to a specific flat can add anywhere from a couple of thousand pounds to £30,000 or £40,000 in parts of Bristol. The same land sitting in the communal area adds nothing to any individual valuation. How you carve up the leases directly changes the number.

4. Odd leases and heavy service charges

Unusual lease lengths and high service charges make your units harder to compare and harder to sell, which a valuer will reflect. This is one of several reasons the lease structure is not an administrative afterthought to be left entirely to a solicitor.

If there is a commercial element

Mixed-use changes the job, because the commercial part is valued on yield and the yield is driven by the strength of the tenant. The same £40,000 a year rent is worth about £571,000 at a 7% yield and about £363,000 at 11%. Same rent. Over £200,000 of difference, entirely down to how safe that income looks.

Which means attracting a stronger tenant is a valuation strategy, not just a letting decision.

One thing that surprises people: commercial lenders judge a unit heavily on its street scene. A cafe or deli sitting among independent shops reads far better than the same unit next to a chip shop, a bargain booze and a vape shop. That is not snobbery, it is resale logic. The street scene drives what an owner-occupier will eventually pay once the flats above are split off.

How to put your case to a valuer, properly

Here is where most people leave money on the table. They let a valuer turn up cold, walk round a building they have never seen before, and work it out from scratch in an afternoon.

I prepare what I call a valuation memorandum. Never call it a "valuation pack" in front of a valuer, by the way. It is built as a short slide deck turned into a PDF, and I deliver it personally rather than emailing it into a void.

What goes in it:

The basis, stated plainly. On a 40-flat conversion I own, the memorandum set out a bricks-and-mortar value of £119 per square foot across the flats, excluding communal areas, reaching about £2.23 million.
Sold comparables to the standard above, with full address, price and date on each.
A rental breakdown table, unit by unit.
Evidence of the refurbishment, so the condition is not guesswork.
The rent progression, disclosed honestly. On that block I showed £14,000 a month at the point of valuation, projected to £16,500 by month end and £19,000 by quarter end.

And here is why full disclosure is not just the right thing but the smart thing: that valuer went away and wrote an estimated rental value of £19,500 a month. More than I had claimed. If I had exaggerated, he would have discounted everything I said. Because every number I gave him checked out, he trusted the direction of travel and went further than I did.

On the figure you put forward: aim a little above the minimum you actually need. If a valuer knocks you back you still have headroom, and a higher agreed value helps you later when you move from bridge to term mortgage.

The line you do not cross. A valuer is an independent professional with duties to the lender, not to you. Your job is to make sure they have all the evidence, presented clearly, so they can reach a properly informed opinion. Your job is never to lean on them for a number.

Full disclosure on day one. Never doctor a document. Not once, not a little bit. Get caught doing that and you are finished with that lender and probably that valuer's whole firm, and deservedly so.

What happens when it comes in low

Sometimes you do everything right and it still lands under. On one of my own blocks the bridge valuation came in low because it landed two weeks after a certain mini-budget, leaving a shortfall of about £87,500 that a private lender had to cover. That block then sat on bridge for eight months at roughly £12,000 a month before it reached term finance.

It came good. But that is exactly why you need contingency behind you and options B and C ready before you exchange. Ask yourself honestly: if the valuation came in 10% under, would this deal still work, or would it quietly ruin your year?

This article explains how valuations on split blocks are generally approached. It is not a valuation, not a substitute for one, and not advice on any specific property. Get a qualified RICS valuer, and get your own professional advice on your own facts. Lender criteria and thresholds mentioned here move, so check the current position before relying on any of it.

Want a second opinion on your numbers?

Book a free fifteen minute call and talk me through the block. If your aggregate valuation does not stand up, far better to hear it from me now than from a valuer after you have spent thousands finding out.

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