In this planning appeal case study, HEAL Planning explains how a Green Belt planning refusal was successfully overturned at appeal for a single-storey home extension in Witley, Surrey, within the administrative area of Waverley Borough Council. The appeal resulted in full planning permission being granted for a modest orangery-style extension and an open canopy porch, despite the site being located within the Green Belt, a Conservation Area, and the Surrey Hills National Landscape.
The homeowner contacted HEAL Planning after Waverley Borough Council refused the original planning application in February, citing Green Belt policy. The council concluded that the proposal amounted to inappropriate development, would harm the openness of the Green Belt, and that no very special circumstances existed to outweigh this harm. The authority also claimed that the extension was disproportionate to the original dwelling and therefore failed to meet policy exceptions.
As with every case, HEAL Planning began with a free, no-obligation consultation. A Specialist Planning Appeal Assessment Officer reviewed the refusal reason in detail, alongside the officer’s report, approved plans, site context, and both local and national planning policy. This early assessment confirmed that there were strong material planning grounds to challenge the decision. A full written proposal was then issued to allow the homeowner to proceed with complete clarity and confidence.
The appeal was submitted under Section 78 to the Planning Inspectorate. Following a site visit in September, the Inspector identified the key issue as whether the proposal constituted inappropriate development in the Green Belt when assessed against the National Planning Policy Framework and the development plan.
The appeal case focused on NPPF paragraph 145(c), which allows extensions to existing buildings in the Green Belt provided they are not disproportionate to the original dwelling. HEAL Planning demonstrated that proportionality is a matter of planning judgment rather than a rigid numerical calculation. While Waverley’s local policy references a forty percent guideline, this figure was shown to be guidance rather than a definitive threshold.
The proposed extension was single storey, low-profile, and clearly subservient to the host dwelling. Its orangery-style design, glazed lantern roof, and open canopy porch significantly reduced perceived bulk and visual mass. The appeal submission also highlighted the site’s strong contextual relationship with surrounding residential development, despite being outside the defined settlement boundary. Mature boundary planting and enclosure limited visibility from public viewpoints, and the use of matching materials ensured visual continuity with the existing house.
The Inspector agreed with this assessment. They concluded that the development was proportionate, fell within the Green Belt exceptions, and therefore was not inappropriate development. As a result, no separate Green Belt openness harm was identified. The Inspector also confirmed that the proposal would preserve the character and appearance of the Conservation Area and conserve the natural beauty of the Surrey Hills National Landscape.
Planning permission was granted with standard conditions, including commencement within three years, compliance with approved plans, and the use of matching external materials. This case demonstrates how Green Belt planning appeals can succeed when proposals are modest, policy-compliant, and supported by a carefully structured, evidence-led appeal strategy.
Green Belt home extension planning appeal
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