The Planning Advisors
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Trusted by 500+ homeowners

Know your planning risk
before you submit

Intelligent assessment of UK planning policy compliance. Identify refusal pressure points early and save time, money, and neighbour goodwill.

Check Your ExtensionSee How It Works
UK Methodology
Instant Analysis
Fixed Fee £29

Most extensions aren't refused
because they're impossible

They're refused because of avoidable design mistakes

Common Refusal Triggers

  • Side extensions that close gaps too far
  • Rear extensions breaching the 45° rule
  • Dormers that dominate the roofscape
  • Green Belt volume limit exceedances

The Hidden Cost

£2,500+
Average cost before refusal
Architect drawings£800-1,500
Application fee£200-500
Time lost8-12 weeks
Neighbour relationsDamaged
Check Before You Commit

How it works

Structured planning assessment in three steps

1

Enter details

Extension type, dimensions, boundary distances, and property context. Takes 3 minutes.

2

Instant assessment

45° rule, gap standards, Green Belt thresholds, overlooking criteria—all applied automatically.

3

Risk analysis

Refusal risk score, pressure points, mitigation guidance, and downloadable PDF report.

Professional Planning Intelligence

Start your assessment now

Join 500+ homeowners who checked their planning risk before committing to costly drawings.

Check My Extension Risk
UK Planning Methodology
NPPF Framework Based
500+ Assessments Complete