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The building boom in Ickenham really gets under way!

In common with the rest of Metroland, new estates began to rise in Ickenham: Ickenham Garden city on the site of Milton Farm, The Swakeleys Estate and Bridge Way, The English (Ivy House) Estate, the Harefield Place Estate and Glebe Estate, which was owned by Francis Jackson's development company. He was associated with George Ball, who built the Manor Homes in Ruislip Manor.

Plans were made to build an estate of 2,311 acres linking Ickenham to South Ruislip, with schools, cinema and shops. Most of the estate was started before 1938, and a site was set aside for a school where Glebe Primary was built in the 1950's. The rest of the land became part of the Middlesex Green Belt.

Road widening and building went on apace. The A40 Western Avenue went as far as Hillingdon Circuit in 1934, and to the Swakeleys Roundabout by 1939, but it was not completed until after the end of the War. Elms were felled along Swakeleys Road and Long Lane, and the High Road was widened in 1935, necessitating the demolition of the Old Schools and the original Fox & Geese. Swakeleys Road became dual carriageway as far as the junction with Breakspear Road South in 1939.

Population figures give an idea of the rate of growth in this decade, although exact comparisons are impossible because the boundaries of the civil parish were enlarged in 1929. The population of the civil parish was 443 in 1921, and 1,741 in 1931.

At the end of this decade all building work came to an abrupt halt as Ickenham again prepared for war.