New Builds, New Prices: What Is Driving London's Development Surge and What Buyers Need to Know Now

London granted planning permission for more than 31,000 new homes in the 12 months to April 2026, the highest annual figure since 2017, according to data held by the Greater London Authority. The number alone is striking. What matters more is where those approvals are concentrated and what they are doing to asking prices in neighbourhoods that were, until recently, considered secondary markets.

The timing is not accidental. The government's revised National Planning Policy Framework, updated in January, removed several of the local veto mechanisms that councils had used to slow or kill large residential schemes. Combined with Sadiq Khan's successor at City Hall pushing a 50 percent affordable-housing threshold on public land only — rather than across all sites — private developers have returned with appetite. Build cost inflation, which peaked at 9.2 percent in 2023, has since eased to closer to 3.5 percent, making schemes viable that were stalled two years ago.

Where the Cranes Are Going Up

The concentration of activity is telling. Along the stretch of the Elizabeth Line between Stratford and Abbey Wood, at least seven major residential schemes are now under construction or awaiting final sign-off. The Hallsville Quarter phase four in Canning Town is due to deliver 486 units by spring 2028, with one-bedroom flats currently marketed off-plan at £415,000 — up roughly £35,000 from the phase-three launch price in early 2024. Further east, the Thamesmead Waterfront scheme, being developed by Peabody and Lendlease across a 200-acre site in SE28, has received outline approval for 11,500 homes over two decades, with the first 1,500 expected to complete before 2030.

In inner south London, the Old Kent Road Opportunity Area is generating particular interest. Two schemes on the corridor — the Ruby Triangle development near Peckham and the Malt Street project — are both past the s106 agreement stage and moving toward detailed construction programmes. Southwark Council approved revised plans for Malt Street in March, clearing the way for 1,300 homes on a former industrial site. Flats on that scheme are not yet publicly marketed, but comparable new builds on the Old Kent Road itself are already trading at £520 per square foot, against a borough-wide resale average closer to £480.

What Buyers Should Actually Do

The price pressure is straightforward to explain: supply is coming, but slowly, and demand is not waiting. The buy-to-let market has also re-entered the conversation since stamp duty surcharge reforms took partial effect in April, reducing the additional rate for properties below £300,000 from 5 percent to 3 percent. That has brought landlord buyers back to Zone 4 and Zone 5 schemes — particularly along the Overground corridor through Walthamstow and Seven Sisters — competing directly with first-time buyers using the extended Mortgage Guarantee Scheme, which runs until December 2027.

For buyers considering off-plan purchases, the critical variable right now is build programme certainty. Several schemes that launched in 2022 and 2023 are running 12 to 18 months late due to earlier supply chain disruptions, meaning buyers who exchanged contracts expecting a 2025 completion are now looking at 2026 or 2027. Solicitors specialising in new-build conveyancing are advising clients to scrutinise the longstop date — the final contractual deadline for completion — rather than the headline estimated delivery date, and to ensure their mortgage offer window is structured accordingly. Some lenders, including Nationwide, now offer 12-month validity on mortgage offers specifically for new-build purchases, which reduces the risk of having to reapply at a worse rate.

The practical advice from agents working the Stratford and Canning Town market is blunt: schemes in Zone 3 with Elizabeth Line access that are launching now are pricing in the infrastructure premium upfront. Buyers who want value are better served looking at Zone 4 launches — particularly around Barking Riverside, where 10,800 homes are planned and London Overground extension works are due to complete in late 2027. The discount to Zone 3 is currently around 18 percent per square foot. That gap will not stay open indefinitely.