How to Value a Property for Probate: RICS Surveyor vs Online Valuation

What Valuation Does HMRC Require?

HMRC requires the open market value of the property at the date of death. This is defined in the Inheritance Tax Act 1984 as the price the property might reasonably be expected to fetch if sold on the open market at that date, with no artificial limitations on purchasers.

This is not the same as:

• The sum insured for buildings insurance purposes.
• The outstanding mortgage balance.
• The price paid when the deceased purchased the property.
• Any current asking price or estate agent marketing appraisal.

The date of death valuation is fixed — subsequent falls or rises in property values do not affect it (although "loss on sale" relief may apply if the property is sold within four years of death at a lower price than the probate value, which can reduce IHT paid).

Method 1: Estate Agent Letters

The most common approach for straightforward residential properties is to obtain written valuations from three local estate agents. Each agent should inspect the property and provide a written letter stating the estimated open market value at the date of death.

HMRC will accept the average (or a well-reasoned single figure) from these letters provided they are clearly dated and reference the date of death specifically. Estate agent letters are less expensive than a RICS survey — typically free or a nominal fee — but carry less weight if HMRC chooses to challenge.

Practical tip: Ask each agent to confirm in writing that the valuation is for probate purposes and reflects the open market value at the specific date of death. A generic "current market appraisal" is not suitable.

Method 2: RICS Red Book Valuation

A RICS (Royal Institution of Chartered Surveyors) Red Book valuation is a formal, professionally indemnified report prepared by a qualified RICS Registered Valuer. It is the gold standard for probate valuations and provides the most defensible evidence against HMRC challenge.

A Red Book valuation typically costs £200–£600 for a standard residential property. For high-value properties, complex properties, or estates where significant IHT is at stake, this cost is almost always justified.

You can find RICS members via the RICS website. When instructing, explicitly state that you require a "Red Book compliant probate valuation at the date of death" — this triggers specific reporting standards.

Method 3: HMRC's District Valuer Service

HMRC has its own team of valuers — the District Valuer Service (DVS) — who review property valuations submitted in IHT400 returns. They can issue a higher valuation if they believe the submitted figure is too low. Their higher figure then becomes the basis for IHT calculation unless you dispute it.

If the DVS challenges your valuation, you have the right to negotiate and, if agreement cannot be reached, to refer the matter to the First- tier Tribunal (Tax). In practice most challenges are resolved by negotiation.

To minimise the risk of challenge, ensure your estate agent letters or RICS report explicitly address comparable sales in the area around the date of death.

Valuing Joint Property

If the deceased owned property jointly, only their share is included in their estate. There are two types of joint ownership:

HMRC accepts a "tenancy in common" discount of typically 10–15% on the deceased's share to reflect the fact that a purchaser cannot buy the whole property from the estate alone. Discuss the appropriate discount with your RICS valuer.

Valuing a Property Subject to a Tenancy

If the property was tenanted, the open market value must reflect this. A tenanted property typically achieves a lower price than a vacant property because the buyer inherits the tenant and cannot immediately sell with vacant possession. Your valuer must be told of any tenancy arrangements.

Deducting the Mortgage

If the property has an outstanding mortgage, this is a liability of the estate. The mortgage balance at the date of death is deducted when calculating the net estate for IHT purposes — it is not deducted from the property valuation itself. For example: property value £400,000, mortgage balance £150,000 = net contribution to estate of £250,000.

Request a redemption statement from the lender for the exact balance at the date of death. For guidance on IHT calculations, see our inheritance tax guide for 2026–27.

Recording the Valuation in IHT400

Property values are reported in Schedule IHT405 (Houses, land, buildings and interests in land) of the IHT400 return. You must provide the full address, tenure (freehold or leasehold), and the valuation figure. For leasehold properties, also note the number of years remaining on the lease. For the complete IHT400 filing process, see our IHT400 form guide.

Once probate is granted and the property is to be transferred to a beneficiary, you will need to complete an AS1 assent form for Land Registry. See our guide to transferring property to a beneficiary with the AS1 assent form.

Loss on Sale Relief

If the property is sold within 4 years of the date of death at a lower price than the probate valuation, you can claim "loss on sale relief" under s191 IHTA 1984. This substitutes the actual sale price for the probate value and reduces the IHT payable. To claim, you must file a claim with HMRC within 4 years of the date of death.

Note that if other property in the estate is also sold within this period, losses and gains are aggregated, and you can only claim if there is a net loss overall across all property disposals.

For further guidance on the estate administration process, see our estate administration checklist, and for applying for probate see our guide to applying for probate. Ready to start? Use our free estate administration tool to get a personalised task list.

Related Guides

• IHT on Jointly Owned Property
• Complete UK Probate Guide 2026
• Paying IHT Before Probate