President Donald Trump’s ambitious plan to add a 90,000-square-foot ballroom to the White House is being carried out with funds raised from private donors and corporations, but experts and preservationists warn that the broader financial and oversight implications remain unclear as the project progresses.

The ballroom, which will replace part of the East Wing and is expected to cost around $300 million, has been financed through a mix of contributions from major technology, defence and industrial firms alongside personal donations from Trump himself.

The White House has repeatedly asserted that no federal taxpayer dollars are being used for construction, relying instead on private gifts routed through the nonprofit Trust for the National Mall.

A list of donors contributing to the ballroom includes prominent companies such as Amazon, Apple, Google, Meta Platforms, Lockheed Martin and Microsoft, as well as individual supporters and foundations.

Some contributions are sizeable, such as a reported $22 million from Google tied to a legal settlement, though the administration has not disclosed the exact amounts each donor has given.

Donors are also given the option to remain anonymous, raising concerns about transparency and influence.

While the project is privately financed, legal and planning experts emphasise that the longer-term costs associated with the ballroom — including security, utilities, staffing and maintenance — are likely to fall under federal responsibility once construction is complete.

Under existing law, privately funded additions to federal properties can proceed without congressional appropriations, but ancillary operational obligations could strain federal budgets down the line.

These downstream impacts are typically not captured in early design reviews and could result in expanded obligations for agencies such as the Secret Service.

The construction has faced legal challenges from preservation groups, which argue that statutory review processes under the National Historic Preservation Act and other federal planning requirements were bypassed.

A federal lawsuit is seeking to halt the project until such reviews are completed, with critics contending that demolishing historic parts of the East Wing and undertaking a large addition should involve broader oversight.

A federal judge has expressed scepticism about the administration’s authority to proceed without congressional approval.

Supporters of the ballroom argue that the new space will provide a modern venue for state functions and diplomatic events that outgrow existing facilities, enhancing the White House’s ability to host large gatherings without erecting external tents.

The debate over private funding, transparency and future federal costs underscores how donor-driven projects within public buildings can raise questions about oversight, legacy and the evolving relationship between private interests and national institutions.