Two-Bed Semi To Six-Bed HMO, No Planning Needed
Cheshunt, Hertfordshire
A two-bed semi tested for a six-bed HMO that needs no planning permission at all, with a five-bed fallback drawn for the loft risk.
Feasibility In Brief
The Brief
The client already ran an HMO nearby and wanted the same product here. Could a two-bed semi take six en-suite bedrooms while staying inside Use Class C4, where the change of use is permitted development and needs no planning permission at all?
What We Found
Six en-suite bedrooms work using the existing footprint and the rear extension already built under permitted development, with the boiler and services moved to the ground floor utility room to free the loft. The loft is the variable: only floor area with headroom above 1.5 metres counts, and it had not been measured, so a five-bed fallback was drawn alongside the six-bed scheme.
Our Recommendation
Proceed as a six-bedroom C4 HMO under permitted development. Measure the loft before fixing the design, and treat the roof works as a separate householder application if the hip-to-gable and rear dormer together exceed the 50 cubic metre allowance.
The Proposed Layout
Option A takes six en-suite bedrooms across three floors with loft rooms of 12.3 and 9.7 sqm. Option B takes five, with a single 22 sqm loft bedroom, if the headroom falls short.
What The Client Received
Feasibility Overview
The proposed design, planning route, key constraints, commercial position and a clear Go or No-Go recommendation.
Planning Research & Risk Analysis
Site-specific policy research, planning precedents, appeal decisions and a risk register with cost implications.
Space & Standards Review
Bedroom, amenity, ceiling-height, kitchen and facility requirements checked room by room against the design.
These are real client reports, so they are not published here.
Official guidance reviewed: Broxbourne HMO Amenity Guidance
The Decision
A clear route forward before purchase.
The feasibility confirmed a compliant six-bedroom layout on a route that needs no planning permission, and identified the unmeasured loft as the one thing that decides between six bedrooms and five.
Recommended roadmap
- 01Measured survey
- 02Confirm loft headroom
- 03Roof works, if needed
- 04Technical design
- 05Construction
- 06C4 lawful development certificate
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