Savills' latest Build to Rent Market Update reveals that institutional investment into the sector reached £4.3 billion in the year to Q2 2026, with the operational stock of purpose-built rental homes now exceeding 128,000 units nationally and a further 115,000 under construction or in planning. The headline figure confirms what many in the sector have suspected for eighteen months: capital that once flowed almost exclusively towards London and the South East is now chasing yield and scale in Britain's second-tier cities, fundamentally reshaping where rental supply will land over the next decade.