Google DeepMind’s PlanAssist is expanding from a three-council pilot to a 12-month beta involving 15 English councils. The AI tool brings together application documents, planning policies and site constraints, then prepares cited draft assessments for planning officers to review.
The UK government’s announcement, published on October 30, 2026, reports a 58% reduction in time spent on key planning tasks during early testing in Camden, Barnet and Dorset. A Google DeepMind post dated October 31 identifies those tasks more specifically as householder application assessments.
That distinction matters. Less officer time spent assessing an application is a useful operational gain, but it is a different measurement from the number of weeks an applicant waits for a decision. The larger beta will test the tool on live applications across more councils, with officers retaining the final say.
How PlanAssist Turns Documents Into Draft Assessments
PlanAssist was developed by Google DeepMind with the UK government, Google Cloud, Faculty and local authorities. Google says it is built with Gemini and supports the processing of routine householder applications, including proposals such as extensions, conservatories and loft conversions.
According to DeepMind’s workflow description, the tool works through four main stages:
- Application validation: It checks documents and architectural drawings to identify whether the required information has been submitted.
- Policy and constraint checks: It examines the proposal against local and national planning policies and relevant site constraints, including protections such as tree preservation orders.
- Previous issues and objections: It checks whether concerns have already been raised, including objections from local residents.
- Draft reporting: It produces cited assessment reports that planning officers can edit before reaching a decision.
The practical benefit is bringing several kinds of evidence into one review process. An officer assessing an extension may need to connect the submitted drawings with the applicable policies, site protections and consultation responses. PlanAssist is intended to reduce the time spent finding and assembling that material.
The citations are consequential. They give an officer a route back to the evidence behind a statement in the draft. But a cited report still needs scrutiny: a source may support a sentence while the assessment misses another relevant document or constraint.
