Work began on 14 June on a helicopter landing pad on the South Lawn of the White House, at a cost put at five million dollars. The stated reason is the grass. The VH-92 Patriot, the Sikorsky aircraft that entered service as Marine One under Joe Biden, is heavier than the machine it replaced and vents its exhaust downward, so the heat burns the lawn every time it sets down. A spokesman said the White House had needed a proper helipad for years, one that lets the president land safely and protects the South Lawn from the fumes.

That much is a real maintenance problem with an unglamorous solution, and most large institutions would have solved it with a reinforced pad and no announcement. This one is finished with an enormous presidential seal cut into granite.

According to the Washington Post, the president was closely involved in the construction, and after several weeks of work the pad was demolished and rebuilt because he judged the slope too steep. Rebuilding a finished concrete and stone structure is not a change order. It is the same job done twice, and the reporting indicates it is likely to have pushed the cost above the stated figure. Nobody has published the revised number.

It also has to be set beside the ballroom. The White House is already building a new one at a reported cost approaching 600 million dollars, which makes the helipad a rounding error inside a much larger programme of works at the presidential residence. The pattern is what makes it worth reporting rather than the sum: a sustained programme of construction at the executive mansion, directed personally, and judged on how it looks.

The South Lawn is not private property. It is a federal site inside a protected historic setting, and permanent changes to it normally pass through review bodies whose job is to weigh alterations against the character of the place. A landing pad hard-standing is a defensible piece of infrastructure. A monumental seal in granite is a permanent decorative statement, and the two things are usually assessed differently.

The defence offered is that the building has never looked better and will look better still. That is the argument, and it is one voters can weigh. What is missing from it is the number: what the demolition and rebuild finally cost, and who signed it off.