Bookham extension appeal wins on bungalow street character

The Bookham extension appeal has succeeded, allowing a bungalow on Westfield Drive in Great Bookham, Surrey, to be enlarged despite concerns about its width, roof shape and spacing. Inspector G Sylvester granted planning permission on 9th October 2026, overturning Mole Valley District Council’s refusal. This is an issued appeal decision, rather than a proposal waiting for approval.

The scheme replaces an existing garage with a single-storey side extension and enlarges the roof to provide a loft conversion, including two rear dormer windows. For neighbours, the central question was whether the bungalow would still fit comfortably within the cul-de-sac. The Inspector found that it would, even though some individual design guidelines were not met.

I would read this as a useful reminder to look beyond a measurement in isolation. The Inspector examined how the whole group of bungalows works together, including the turning head, front gardens and remaining gaps. If you’re planning an extension locally, that reasoning matters more than assuming that another homeowner’s successful appeal gives you the same permission.

Why the Bookham extension fitted the street

Westfield Drive is described in the decision as a residential cul-de-sac with detached bungalows, clear building lines and broadly similar traditional designs. Their compact hipped roofs have short ridgelines, giving the street a recognisable and cohesive appearance. A hipped roof slopes down on all sides, rather than ending in a vertical gable.

The appeal bungalow stands within the small group facing the turning head, where gaps are wider than along much of the western side of the street. The Inspector found that the road’s spacious character comes mainly from the open area across the street: front gardens, carriageway, pavements and verges together create that impression.

The Bookham extension would reduce the gap to the bungalow on its northern side. However, the council’s evidence indicated that about 4.5 metres would remain between the buildings. That would be broadly comparable to the gap on the appeal property’s southern side, leaving a consistent arrangement around the turning head.

That comparison helped the Inspector conclude that the extended home would not look cramped. I find that distinction useful: the distance between buildings, the distance to a boundary and the overall impression of space are related, but they are not interchangeable measurements.

A wider roof was acceptable in this particular position

The proposal would give the bungalow a wider frontage, longer ridge and greater overall bulk. The Inspector accepted that its compact roof form would be diminished and that it would no longer share the same scale and massing as neighbouring bungalows. The decision therefore acknowledges a departure from the design code’s expectation on those points.

However, the building’s central position at the end of the cul-de-sac changed the assessment. Its wider frontage would become a focal point, with narrower bungalows arranged around it. Taken together, the group would remain balanced and cohesive, and the extension would respect the existing bungalow’s style.

In the Bookham extension decision, that street-level assessment outweighed the argument that matching every neighbouring building’s dimensions was necessary. The Inspector nevertheless made clear that future schemes would require their own assessment. This permission is not a general approval for wider roofs throughout Bookham.

His warning is worth keeping alongside the successful outcome: “Any future proposals would need to be assessed on their own merits and context.” If your home occupies a different position, the same roof enlargement could have a different visual effect.

How the design guidance was applied

The decision considers the Bookham & Fetcham Design Code 2025, the Mole Valley Local Plan adopted in October 2024, the Bookham Neighbourhood Development Plan and the council’s July 2025 house-extension guidance. These documents set the local expectations against which the design was assessed.

The proposal would not maintain the existing space to the northern boundary or a consistent one-metre boundary gap. Those matters appear in the design guidance. But the Inspector found that the relationship between the neighbouring buildings would still respect the surrounding layout, design and character.

The Bookham extension therefore complied with the relevant neighbourhood-plan policy as a whole, rather than failing simply because one suggested spacing arrangement was not retained. The Inspector also concluded that it met the Local Plan’s objectives on local character, development pattern and appropriate spacing.

I would approach a similar application by showing that relationship clearly on accurate drawings. A statement saying that your design is attractive won’t answer a concern about spacing. Plans, elevations and a careful explanation of the street’s actual pattern give the decision-maker something concrete to assess.

Dormers, existing works and neighbours

The proposed rear dormer would be barely visible from the street, while the rooflights would sit almost flush with the roof plane. The Inspector and council agreed that those elements would not harm the area’s character. The decision also records an existing rear dormer and side rooflights, although the Inspector assessed the proposal against the baseline shown on the submitted plans.

No policy was identified that specifically prevented loft conversions in bungalows. The Inspector gave limited weight to the loss of a single-storey dwelling and noted a lawful development certificate indicating that a form of loft conversion could be undertaken under national permitted development rights.

That does not turn the entire Bookham extension into permitted development. The appeal granted planning permission for the particular submitted scheme. If you’re considering a different roof alteration, our Class B roof and dormer guidance explains the separate national route and its limits.

Neighbouring living conditions were also considered. The Inspector found that the separation distances would avoid harm, including to properties behind the site on Bushy Road. Concerns about boundary encroachment were addressed separately: planning permission does not override landownership or private property rights.

What the permission requires before and after building

The permission carries four conditions. Work must begin within three years of the decision and follow the specified approved drawings. External materials must match the existing dwelling. The side-facing rooflights must have obscure glazing before the extension is occupied, with opening restricted unless the opening parts are more than 1.7 metres above the relevant floor.

Those privacy requirements must be retained afterwards. I would check them against the specification before ordering rooflights, rather than discovering late in the build that the chosen units cannot meet the condition. Our planning conditions guidance explains why the wording attached to an approval matters.

For homeowners reading the Bookham extension decision, the practical lesson is to build an evidence-based design case around the actual site. For neighbours, it is to explain the specific effect you are concerned about, such as an enclosing wall or overlooking window. Neither side is helped by treating a guideline as an automatic answer.

You can read the full official decision for appeal 6013739 and the Planning Inspectorate case record. The application reference is MO/2026/00714. The available record contains no separate costs decision, so this report makes no claim that costs were awarded.

If you are weighing up a refusal, our planning appeals guide explains the route. We can help with the planning assessment, but the starting point remains your own drawings, local policies and reasons for refusal.