If you have ever waited weeks to hear back on a loft conversion or rear extension in England, this one is for you. The UK government and Google DeepMind are expanding PlanAssist, an AI tool built with Gemini that helps council planning officers assess routine home applications. After pilots in three councils, it is now entering a 12-month beta across 15 councils.

Coffee summary

  • FACT: PlanAssist was piloted in Barnet, Camden, and Dorset from June 2026 and now enters a 12-month beta across 15 councils.
  • CLAIM: Google DeepMind says pilot councils cut officer time on householder assessments by 58%, and over 70% of AI-drafted reports were approved without edits.
  • CLAIM: The government says the tool is helping it halve processing times for routine householder applications, from eight weeks to four.
  • FACT: Subject to successful testing, the government intends to make PlanAssist available to every council in England by the end of 2027. It will not be mandated software.
  • FACT: Planning officers still make the final decision.

What happened

The government announced the expansion on October 30, 2026, and Google DeepMind followed with a blog post on October 31. PlanAssist is built with Gemini. The government says it was developed with Google DeepMind, Google Cloud, Faculty, and local authorities, as part of work led through its Incubator for AI (i.AI).

The 12 new beta councils are Ashford, Bristol, Cumberland, Lambeth, Newcastle, North Lincolnshire, Nottingham, Redbridge, Rochdale, South Gloucestershire, Stoke-on-Trent, and Westminster. With the three pilot councils, that makes 15. DeepMind says the new councils will be onboarded in three cohorts and the beta uses live applications.

What the tool does

PlanAssist focuses on householder applications: changes to an existing home, such as extensions, loft conversions, or conservatories. The government says these account for nearly 70% of applications each year, and DeepMind says up to 70% of officers’ workloads.

According to DeepMind, the tool works in four steps:

  1. Validate the application documents and architectural drawings.
  2. Check heritage constraints (such as tree preservation orders) and local and national planning policies.
  3. Review whether issues or objections were raised before, such as by local residents.
  4. Draft a fully cited report that the planning officer can edit before deciding.

Why it matters

OPINION: Faster answers on small home projects matter to families, and freeing officers’ time matters to housing policy. DeepMind links the tool to the government’s goal of 1.5 million new homes by 2029. The argument is simple: if AI handles routine paperwork, officers can spend more time on complex cases and major developments.

Two other changes arrive alongside it. From October 31, a new National Scheme of Delegation means straightforward applications are decided by expert planning officers rather than waiting for a planning committee slot. The government also says 420 planners have been recruited through government-backed programmes.

Who should care

  • Homeowners in England planning extensions or other home improvements.
  • Architects and planning agents who submit householder applications for clients.
  • Council planning teams deciding whether to join the rollout.
  • Other governments watching public-sector AI in action.

Limitations

  • Early data. The 58% and 70% figures come from three pilot councils, as reported by Google DeepMind. Independent evaluations have not been published.
  • Projection, not a promise. The 8-to-4-week figure is the government’s estimate for routine cases, not a guaranteed decision time.
  • Routine cases only. The tool targets householder applications, not major developments.
  • Uneven adoption. Councils can choose whether to use the tool, so waits may still differ by area.
  • Oversight matters. AI-drafted reports can contain errors, so officer review remains essential.

What to do next

  1. Homeowners: submit complete applications with clear drawings. Any assessment, AI-assisted or not, works better with good documents.
  2. Check your council. See whether your local authority is in the beta list above.
  3. Agents and architects: ask partner councils how AI-drafted reports are reviewed and how to raise concerns.
  4. Council teams: watch for guidance on the wider rollout. The government is also requiring key planning documents to be digitised and published as open data by the end of 2027.

AIImpish Take

PlanAssist is a good example of practical public-sector AI: a narrow, high-volume task, a human making the final call, and a staged rollout. The pilot numbers are promising but come from the people who built it. The 12-month beta is the real test, and independent results should decide how far it goes.

Related on AIImpish

*Sources: Google DeepMind, “Speeding up planning decisions with AI,” Oct 31, 2026; GOV.UK, “Faster planning decisions as new rules and AI tackle delays,” Oct 30, 2026.*