A set of replacement doors for the Orangery at Windsor Castle cost £1.2m, new royal accounts show.
The 20 bespoke doors were installed on the East Terrace after the previous set suffered severe wood rot and decay.
Figures show the monarchy also spent £1m on ceiling inspections and £1.5m on food and drink hospitality within the royal households.
Meanwhile, travel expenses for the royal family topped £4.5m – including a £154,000 trip to Italy, Romania and Austria made by the Prince of Wales and Duchess of Cornwall in April.
Image: Prince Charles in Amatrice, Italy, during his six-figure trip with the Duchess of Cornwall
The Queen is said to keep an eye on travel expenses, which she has to sign off on, and is known to “have a word” if they seem too costly, according to palace officials.
Other costly trips included the Duke and Duchess of Cambridge’s state visit to India and Bhutan (£97,703), and the Duke of York’s trip to Mozambique and Botswana (£54,000).
The Royal Train was also expensive, with £288,697 spent on just 14 trips.
One of those visits was made by the Duke of Edinburgh to an anniversary dinner in Devon, which cost £18,690.
Image: In all, travel expenses for the royal family topped 4.5m
A royal source said: “We believe that, though it’s not the cheapest way to travel, it does represent many of the features that we look for in terms of safety, security, not causing disruption to lots of other people – convenience – environmental aspects it’s strong on as well.”
The annual accounts show the Queen’s expenditure was £41.9m last year.
It came as the Crown Estate’s profits jumped by 8% to £328.8m, while the Prince of Wales’ private income from the Duchy of Cornwall was £20.7m.
Sir Alan Reid, Keeper of the Privy Purse, said the Sovereign Grant paid to the Queen equated to 65p per person in the UK.
Image: Republic’s Graham Smith claims the crown cost 345m last year
He said: “Consider that against what the Queen does and represents for this country, I believe it represents excellent value for money.”
Graham Smith, chief executive of campaign group Republic, claimed the actual cost of the crown was around £345m.
He said: “This massive bill for the taxpayer is supporting privileged lifestyles: helicopter flights around the country, palatial homes, round-the-clock security for minor royals who should pay their own way, and millions of pounds in cash handed to the family by the two duchies.”