1. How a bank valuation is calculated
Mortgage approval rests on two legs: your ability to repay (income, debt servicing ratio, stress test) and the value of the security — the flat. Valuers appointed by the bank use the comparison method: recent registered transactions in the same estate with similar age, orientation, floor and saleable area, adjusted for floor level, view, condition and title.
Valuers read registered transaction prices from the Land Registry, not agents' asking prices. Asking prices typically sit several percent above eventual transaction prices, and that spread is exactly where valuation gaps come from.
The rule that matters: loan-to-value is applied to the lower of price and valuation. A valuation above your price gives you nothing; a valuation below it directly reduces what you can borrow.
| Valuation factor | Effect | Note |
|---|---|---|
| Comparables, last 3–6 months | Primary driver | Closer in time and specification carries more weight |
| Saleable area and layout | Small or awkward units discounted | Saleable, not gross, area |
| Floor and view | High floor / sea view uplift | Same block can vary 5%+ across floors |
| Building age and condition | Older and single-block discounted | Pending major repairs make valuers cautious |
| Title and use | Heavy discounts for stigma, illegal structures, village houses | Some banks decline outright |
2. What a shortfall costs in cash
Take an HK$8M purchase at 70% LTV. If the valuation matches at HK$8M, the loan is HK$5.6M and the deposit HK$2.4M. If the valuation is HK$7.6M, the bank lends on the lower figure — HK$5.32M — and you find HK$280,000 more in cash.
In other words, every HK$1M of shortfall costs you HK$700,000 in additional cash at 70% LTV. That money cannot be borrowed, and it cannot be renegotiated after the provisional agreement is signed — the price is locked at that point.
| Price | Valuation | Loan at 70% | Extra cash needed |
|---|---|---|---|
| HK$8.0M | HK$8.0M (full) | HK$5.60M | — |
| HK$8.0M | HK$7.8M | HK$5.46M | HK$140,000 |
| HK$8.0M | HK$7.6M | HK$5.32M | HK$280,000 |
| HK$8.0M | HK$7.2M | HK$5.04M | HK$560,000 |
3. Why banks value the same flat differently
The same unit can be valued 3% to 8% apart across banks. Different valuation firms, different risk appetite for a given estate, different internal discounts for older and single-block buildings, and the gap between an instant online estimate and a formal valuation all contribute.
Online estimates are indicative only; the bank relies on the formal report. Practically: run online estimates at several banks first, then submit formal applications to the one or two that value highest on acceptable rate and cash-rebate terms.
Valuations track the market. When the index is falling, valuers weight the most recent transactions and older comparables lose relevance — which is why shortfalls cluster in soft markets.
4. Five ways to close the gap
One: ask the bank to review, supplying recent same-block transactions, photographs and a floor plan explaining why the closest comparables support a higher figure.
Two: apply to another bank. Results differ enough that one extra application is the fastest single fix.
Three: take mortgage insurance to raise LTV. Premiums are charged on the loan and the lower valuation still applies, so it eases the cash need rather than removing the gap.
Four: increase the deposit or extend the tenor — paying with liquidity or with total interest.
Five: negotiate the price down to the valuation before the provisional agreement is signed. This is the only route that costs you nothing.
5. Negotiation is the cleanest fix
A shortfall simply means the asking price sits above what comparable transactions support; the bank has put a number on it. Since valuation is anchored on registered transactions, negotiating from those same transactions is the direct way to bring the price back to value.
On that HK$8M flat, a 3% reduction (HK$240,000) removes most of the shortfall outright, and simultaneously reduces ad valorem stamp duty, commission and thirty years of mortgage interest.
Sources: Rating and Valuation Department, Hong Kong Property Review Monthly Supplement (private domestic price index and price per square metre by class A–E); Land Registry residential sale and purchase agreement statistics; HKMA residential mortgage guidelines and survey. Check the latest official release before relying on any figure.