Two-storey rear extension refusal overturned on appeal in Barnet.

Barnet refused a two-storey rear extension on Trinder Road on two grounds: harm to character, and harm to the neighbour at the shared boundary. The Inspector allowed it anyway — largely because of what was already on the street, and what was already screening the boundary.

The application

✓Site: a semi-detached house on Trinder Road, Barnet.
✓Proposal: a two-storey rear extension — full-width at ground floor, narrower at first floor, projecting around 3m and tying into the existing hipped roof.
✓Decision: refused by Barnet, then allowed on appeal by the Planning Inspectorate.

Why the council refused it

Barnet gave two refusal reasons. First, that the extension's size, width, massing and bulk made it an incongruous, unsympathetic addition, harmful to the character of the house and the surrounding area. Second, that its size and closeness to the boundary with the next-door neighbour would be visually obtrusive and overbearing from that neighbour's rear garden — causing loss of outlook, loss of amenity, and an increased sense of enclosure.

Both reasons cited the London Plan's design policy, two Barnet Local Plan policies, and the council's Residential Design Guidance SPD.

What the Inspector found

The Inspector allowed the appeal in full, adding a condition restricting new windows in the extension's side walls to protect the neighbour's privacy. On character, the Inspector's site visit found extensions of a similar scale already existing nearby — part of an established local pattern, not an outlier. The proposal's stepped form (full-width ground floor, narrower first floor) and its continuation of the existing roof line read as proportionate rather than dominant.

On the neighbour impact, the Inspector noted the boundary already had substantial screening — a timber fence on gravel boards plus a tall evergreen hedge — which largely hid the ground-floor element from the neighbour's garden. The first floor was also recessed near the boundary, reducing its visual presence further. The Inspector accepted the extension would reduce daylight to one of the neighbour's windows, but judged that reduction too modest to count as unacceptable harm.

Where the council's assessment fell short

A few gaps stand out when you compare the refusal reasons to the Inspector's decision:

Local precedent wasn't weighed against the "unsympathetic" claim. The character objection treated the extension's scale as inherently harmful, but the Inspector found similar-scale rear extensions already established nearby. A council reason that doesn't engage with what's already built close by is only telling half the story.

Existing boundary screening wasn't reflected in the amenity reason. The refusal describes the extension as visually obtrusive and overbearing from the neighbour's garden, but doesn't account for the fence, gravel boards and mature hedge already reducing that neighbour's exposure — features the Inspector treated as central to the outcome.

Some harm isn't the same as unacceptable harm. The Inspector didn't dispute that daylight to one window would be reduced. The test that actually matters is whether that reduction is significant enough to be unacceptable — and here, it wasn't. A refusal reason built on a real but modest impact can still fail on appeal if it doesn't clear that bar.

What this means for other appeals

✓Document what's already on your street. Similar-scale extensions nearby are strong evidence against a "harms local character" objection — photograph them and reference them specifically.
✓Point to existing screening at the boundary. Fences, hedges, and other established features that already limit a neighbour's view or exposure are directly relevant to an overbearing or loss-of-outlook objection.
✓Ask whether the harm alleged is actually "unacceptable," not just present. A council can be right that there's some impact and still be wrong that it justifies refusal. The relevant test is the degree of harm, not whether any harm exists at all.

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