Why Accurate Dimensions Matter When Buying Antiques

Dimensions affect identity, use and transport. Overall height, width and depth are insufficient for many objects: record cornice, base, door swing, knee clearance, leaf extensions, dismantled sections and the largest indivisible component.

Establish the claim

Write down exactly what is being asserted: maker, date, material, provenance, condition, legal status or price. Then separate observation from interpretation. An inscription, invoice or construction feature is evidence; the conclusion drawn from it remains an opinion whose strength depends on context and comparison.

What to examine

Ask whether measurements include handles, mouldings and projecting feet.
Measure doors, stairs, landings, lifts and turning circles.
Confirm whether the object dismantles and whether doing so is historically and structurally safe.
Use dimensions to test whether parts have been cut down or associated.

Use good diffuse light and inspect the front, back, underside and interior. Raking light reveals surface changes; a hand lens helps with tool marks, fibres, coatings and metalwork. Do not scrape, polish, dismantle or use chemical tests. Ask for photographs with a scale when inspection is remote.

Condition, originality and restoration

Originality is not all-or-nothing. Record the status of each major component, surface and fitting. Look for redundant holes, shadow lines, altered rebates, inconsistent oxidation, different tool marks and abrupt changes in wear. A well-executed historic repair may be acceptable and informative; undisclosed reconstruction that changes identity is different.

Condition reports are normally limited observations, not warranties or conservation proposals. Ask whether defects are stable or active, whether the object safely performs its intended function and which areas could not be inspected. Obtain a specialist estimate before buying when structural repair, complex surfaces, regulated materials or mechanisms are involved.

Research and due diligence

Compare the object with securely dated museum examples and primary documentation such as catalogues, patents, inventories and archival photographs. Dealer listings and auction archives are useful leads, but repeated descriptions do not become proof. Verify names, dates and provenance against independent records.

Read the seller's terms before payment. Establish return rights, guarantees, applicable taxes, collection deadline, insurance responsibility and all fees. For protected species, cultural property, export, electrical safety or upholstered furniture, check the law currently applicable to the object and transaction rather than relying on an old invoice.

Record the transaction

Keep the listing, condition report, correspondence, invoice, receipt, transport record and photographs together. The invoice should preserve the precise attribution wording and disclose known replacements or restoration. Give the object a stable collection number and record later treatment without erasing earlier history.

Practical decision test

Can the object be identified consistently from the supplied evidence?
Do construction, materials and wear support the proposed date?
Are condition and restoration sufficiently disclosed?
Is provenance documented rather than merely repeated?
Have fees, transport, insurance and likely conservation been included?
Are legal, safety and ethical questions resolved before payment?
Would the purchase still make sense if the weakest unsupported claim were removed?

A defensible purchase does not require certainty about everything. It requires clear boundaries between fact, informed opinion and unknowns—and a price appropriate to those boundaries.

Sources and further reading

[Christie's auction terminology](https://www.christies.com/en/help/glossary)
[CINOA Code of Ethics](https://www.cinoa.org/about/code-of-ethics/)
[UK Government: furniture fire-safety regulations](https://www.gov.uk/government/publications/furniture-and-furnishings-fire-safety-regulations)
[Victoria and Albert Museum collections](https://www.vam.ac.uk/collections)