PlanAssist Expands to 15 Councils: How AI Is Cutting UK Planning Waits From Eight Weeks to Four

Getting planning permission for a home extension has long been a test of patience in England. Loft conversions, rear extensions and conservatories are the everyday end of the planning system, yet applicants have often waited weeks while officers worked through paperwork, policies and site constraints. On 30 October 2026, the UK government announced a set of changes designed to speed that process up, and at the centre of the announcement is an artificial intelligence tool called PlanAssist.

PlanAssist is not a robot that approves or refuses applications on its own. According to the government, it pulls together the application, the relevant local policies and the constraints on a site into one place, then gives a trained planning officer an evidence-backed initial assessment to review. The officer still makes the decision. What changes is how much routine admin sits between the application landing on a desk and that decision being made.

What PlanAssist actually does

Planning officers deal with a lot of documents. A single householder application can involve drawings, forms, local plan policies, conservation area rules, flood risk notes and neighbour comments. Finding the right passage in the right document takes time, and that time adds up across thousands of applications.

PlanAssist is designed to cut that searching down. Developed with Google DeepMind, Google Cloud, Faculty and local authorities, the tool brings applications, policies and site constraints together so officers can find key information more quickly. It then produces an initial assessment, backed by the evidence it has gathered, for the officer to consider alongside their normal process.

The numbers behind the expansion

The headline figure in the announcement is a 58 percent cut in time spent on key planning tasks during early testing. The government says that helped halve processing times for routine householder applications, from eight weeks to four weeks.

Those early tests ran in three councils: Camden, Barnet and Dorset. Following that trial, PlanAssist will now expand to 15 councils for 12 months. The 12 councils joining the trial are Ashford, Lambeth, Newcastle, Nottingham, Bristol, Cumberland, North Lincolnshire, Rochdale, Redbridge, South Gloucestershire, Stoke-on-Trent and Westminster. The government says it intends to make the tool available to every council in England by the end of 2027.

The wider planning changes announced at the same time

PlanAssist did not arrive on its own. From Saturday 31 October 2026, a new National Scheme of Delegation means straightforward applications will be decided by expert planning officers rather than waiting for a planning committee slot. The government says this should give applicants greater certainty and free councillors to focus on the most significant developments.

Staffing is the other half of the package. The government says 420 planners have been recruited through government-backed programmes, passing its 2024 manifesto commitment to recruit 300 additional planners. Housing Secretary Angela Rayner said the government would go further, with 1,400 new recruits across the planning system by the end of this Parliament.

Why the government is pushing AI into planning now

Planning has become a bottleneck story in Britain. The government has set ambitious housebuilding targets, and slow decisions on everyday applications feed a wider sense that the system moves too slowly. AI Minister Kanishka Narayan framed PlanAssist as AI put to work in practice, saying it slashes time on routine tasks by more than half while freeing skilled planners for major developments.

Faculty, the third partner, stressed trust. Its director of public services, Paul Maltby, said the system was shaped with planning officers in Camden, Dorset and Barnet, and that it shows its working in a way officers can follow.

What this means if you are planning an extension

For most homeowners, the immediate change is not PlanAssist itself but the delegation rule. If your application is straightforward, it should now be decided by an officer rather than waiting for a committee date. That alone could remove a source of delay that had little to do with the merits of the application.

If you live in one of the 15 trial councils, your application may also be processed with PlanAssist in the background. You will not interact with the tool directly, and you should not expect a different standard of decision. The test is whether your decision arrives sooner, with the same care applied to policies and constraints.

There are limits to what the announcement promises. The 58 percent figure covers time spent on key tasks in early testing, not every application in every council. The eight-weeks-to-four-weeks comparison covers routine householder applications, not complex schemes. And the nationwide rollout is an intention for the end of 2027, not a guarantee for next month.

Still, the direction is clear. The government is also mandating the digitisation and publication of key planning documents as open data by the end of 2027, which should improve the data that tools like PlanAssist can work with.

Questions worth asking as the trial grows

The 12-month expansion to 15 councils is a test at scale. Will the time savings hold when the tool meets a wider mix of applications, from conservation areas to flood zones? Will officers find the initial assessments consistently reliable? And will applicants notice a difference in practice, or will other bottlenecks, such as validation and neighbour consultation, keep overall waits long?

Those questions cannot be answered from a press release. They will be answered by the trial itself, council by council, application by application. What can be said now is that the government has chosen a cautious model: human officers in charge, AI doing the gathering and the first draft of the assessment, and a staged rollout rather than a sudden nationwide switch.

Frequently Asked Questions

What is PlanAssist?

PlanAssist is an AI tool developed with Google DeepMind, Google Cloud, Faculty and local authorities. It brings together planning applications, local policies and site constraints, and gives planning officers an evidence-backed initial assessment to review. Officers remain responsible for the final decision.

Which councils are using PlanAssist?

After trials in Camden, Barnet and Dorset, the tool is expanding to 15 councils for 12 months. The additional councils are Ashford, Lambeth, Newcastle, Nottingham, Bristol, Cumberland, North Lincolnshire, Rochdale, Redbridge, South Gloucestershire, Stoke-on-Trent and Westminster. The government intends to make it available to every council in England by the end of 2027.

Will PlanAssist decide my planning application?

No. According to the government, PlanAssist supports officers by gathering information and providing an initial assessment. Planning officers review applications and make the decisions, using the tool alongside their normal process.