For probate you always need a house valuation, but you do not always need to pay for a formal one. If the estate sits comfortably below the inheritance tax threshold, a written estate agent opinion is usually enough. If it is near or above the threshold, HMRC expects a RICS Red Book valuation at the open market value on the date of death (gov.uk, valuing the estate of someone who died, as at August 2026, subject to change).
The word "valuation" causes most of the confusion. Everyone needs a figure for the house, because it forms part of the estate reported for probate and inheritance tax. What changes is how formal that figure must be. This guide sets out the level you actually need, and why the answer turns on tax, not on probate itself. Figures are current as at August 2026 and are subject to change.
Do you always need a house valuation for probate?
Yes. You cannot apply for probate or complete the inheritance tax forms without a value for the house, because it forms part of the estate's total, and that total decides both the probate route and any tax. What varies is how formal the figure must be, from your own researched estimate to a chartered surveyor's written report.
The figure required is the open market value at the date of death: the price the property might reasonably be expected to fetch if sold on the open market on the day the owner died (HMRC Inheritance Tax Manual, IHTM09703, s.160 IHTA 1984, as at August 2026, subject to change). It is not the insurance rebuild figure, the mortgage value, or a quick cash offer. How much rigour you put behind it should track how close the estate is to the £325,000 nil-rate band (gov.uk/inheritance-tax, as at August 2026, subject to change).
Which house valuation do you actually need?
The right level of valuation depends on the size and simplicity of the estate, not on the fact that probate is needed. The table below maps common situations to the route that usually suits; where inheritance tax is in question, err towards the more formal option.
| Estate situation | Valuation that usually suits | Why |
|---|---|---|
| Estate well below £325,000, ordinary house, no tax at stake | Your own researched estimate | Backed by Land Registry sold prices and portal listings for similar homes, and kept on file. |
| Estate below the threshold but not obviously so | Two or three written estate agent opinions | Free, and an average gives a defensible range if anyone queries it later. |
| Estate near or above £325,000 (or £500,000 with the home passing to children) | RICS Red Book valuation | The strongest evidence if HMRC questions the figure and tax turns on it. |
| High-value, unusual, part-share, tenanted, or land with development potential | RICS Red Book valuation | Value turns on facts and judgement that a professional is best placed to assess. |
General guidance only. A residence nil-rate band of up to £175,000 can lift a couple's combined allowances to £1,000,000 where a home passes to direct descendants (gov.uk, as at August 2026, subject to change). For land specifically, see our guide to valuing land for probate.
Estate agent opinion or a RICS Red Book valuation?
HMRC accepts both a written estate agent opinion and a RICS Red Book valuation for probate (gov.uk, as at August 2026, subject to change). The estate agent route is free but carries less weight; the RICS route costs money but is the most defensible, commonly in the region of £300 to £800 for a standard residential property, depending on the property and the area.
| Feature | Estate agent opinion | RICS Red Book valuation |
|---|---|---|
| Typical cost | Usually free | Commonly around £300 to £800 |
| Weight with HMRC | Accepted, but lighter | Strongest evidence if queried |
| Written to the date of death | Sometimes, if you ask | Yes, formally, with comparables |
| Best suited to | Estates below the tax threshold | Estates near or above the threshold, or complex property |
How do you get the house valued for probate?
Whichever route you take, the aim is a figure that reflects the open market value on the date of death and that you can support with evidence. The steps below apply to both estate agent opinions and RICS valuations.
- Tell the valuer it is for probate, so you get the date-of-death market value, not an optimistic asking price.
- Ask for the value as at the date of death, not today's value, especially if months have passed.
- On the estate agent route, get two or three written opinions rather than relying on a single figure.
- For any estate near the inheritance tax threshold, instruct a RICS registered valuer for a Red Book report with comparable sales.
- Keep every valuation and its evidence on file, because HMRC can review figures for several years.
The value then feeds into the estate total you report. Where a full account is needed, houses and land go on form IHT405, which attaches to form IHT400; many smaller "excepted" estates report values through the probate application instead (gov.uk, as at August 2026, subject to change). Our overview of what probate is and how it works shows where valuation fits in.
Do you still need a valuation if everything passes to your spouse?
Usually yes, even though there is no tax to worry about. Transfers between spouses and civil partners are exempt from inheritance tax, so many people assume the house value barely matters. In practice the date-of-death value still does real work later, on two points that are easy to miss.
First, the probate value becomes the base cost for capital gains tax, so if the property is later sold for more, the gain is measured from that figure and a low value today can mean a larger bill on the future sale. Second, an accurate record supports the transferable nil-rate band, making the unused allowances simpler to claim on the second estate. A written estate agent opinion is normally fine in a spouse-exempt estate, but do obtain one and keep it. Our inheritance tax guide explains how allowances pass between spouses.
What happens if you undervalue the house?
An under-value can be costly. HMRC can refer a property figure to the Valuation Office Agency, whose District Valuer is a chartered surveyor acting for HMRC (gov.uk, Valuation Office Agency, as at August 2026). If the figure was too low and tax was underpaid, additional tax, interest and penalties can follow, and the personal representative can be personally exposed for a figure they cannot support. A RICS Red Book report prepared as at the date of death, supported by comparable sales, is the strongest answer to such a query, which is why the cost is often worth it once an estate is near the threshold. For a deeper walk-through, see our probate property valuation guide.