Eight horses belonging to the Household Cavalry have had to be rehoused because construction work on a nearby military museum is too noisy.
Horse Guards members take part in the Changing of the Guard
Horse Guards said the horses were moved move from the Whitehall stables - where the new museum is being built - to Hyde Park Barracks in Knightsbridge.
The move has altered the Changing of the Guards ceremony.
All 16 horses taking part in the daily ceremony now trot down from the barracks in Knightsbridge.
The horses come from the Life Guards and Blues and Royals regiments of the Queen's Life Guards.
The two sentries in the ceremony at Horse Guards, who normally take part on horseback, are now performing their duties on foot.
The horses were moved because of the noise generated during the work on the £4.5m Household Cavalry Museum, which has been moved from Combermere Barracks, Windsor, the home of the Household Cavalry.
Lt Col David Sievwright of Horse Guards said: "This is simply a matter of horse welfare as there is considerable noise and a large number of skip lorries coming and going while large quantities of concrete are taken off site.
"However, it has always been the intention to maintain the majesty of the Queen's Life Guard and to maintain a military equestrian presence on the streets."
The new museum is due to open on 12 June next year, though Col Sievwright said the Queen's Life Guard should should return to their original routines by the end of September.