Between 1921 and 1981 the number of Kingsdown residents grew substantially to nearly 5000. Cul-de-sac construction added to the existing roads and several park home estates were built for older residents. A new primary school on Fawkham Road was built to take the growing number of children. Electricity was introduced in 1937 but mains drainage was only installed in 1968. During this period Brands Hatch Farm opened its land to cyclists for racing, the precursor to Brand Hatch Racing Circuit. The A20 was widened to a dual carriageway (subsequently reduced to single carriageway) and the trees that lined the road lost to the village. The construction of the M20, taking traffic to Dover, meant that the village was no longer a major thoroughfare for cars, coaches and lorries.