Croydon replacement dwelling appeal wins as self-build BNG undertaking survives title issue

A Croydon replacement dwelling appeal has been allowed after the Inspector found that a much larger house would still fit the varied character of Pollards Hill South and accepted a self-build planning obligation despite a residual Land Registry interest.

The official appeal record identifies application 25/00667/FUL at Pollards Hill South, Norbury, where the proposal was to demolish an extended bungalow and garage and replace them with a two-storey four-bedroom detached house with roof accommodation, together with a detached garden room, bin store and cycle store.

Inspector Alice James allowed replacement dwelling appeal 6003513 on 2nd October 2026. The decision is useful not only on character and design, but also on self-build, biodiversity net gain and the treatment of a unilateral undertaking where the appellant was the beneficial owner but another party remained on the registered title.

Replacement dwelling appeal turns on actual street character

The Council’s objection focused on character and appearance. Pollards Hill South contains terraces on one side and larger detached homes on the other, with varying architectural styles, gaps, heights and roof forms. The detached homes stand on a hill, producing staggered rooflines.

The existing bungalow was not itself typical of the larger detached houses around it. It had been extended over time, giving it a disjointed roof form which the Inspector considered unrepresentative of the prevailing rhythm of the street.

The replacement would plainly be larger and more prominent. However, the Inspector found that the generous plot could absorb the additional scale. Clear gaps to neighbouring houses would remain, the proposed hipped roof reduced the apparent mass, and the stepped front elevation reflected features found elsewhere nearby.

The house would also remain set back from the road with parking and landscaping in front. In that context, a larger building was not treated as automatically harmful simply because it represented a substantial increase over the bungalow being replaced.

Why the earlier replacement dwelling appeal did not decide this scheme

Third parties referred to the earlier dismissed appeal, APP/L5240/W/24/3339737, on the same site. The Inspector did not treat that earlier outcome as determinative because the previous proposal was materially different in design.

That is a useful reminder for resubmissions. A previous appeal is important context, but its weight depends on how closely the later scheme reproduces the development previously considered. A genuinely revised design can justify a fresh planning judgement.

Self-build BNG undertaking survived a title issue

During the planning appeal, the appellant submitted a unilateral undertaking intended to secure the replacement house as self-build. That mattered because the application pre-dated the removal of the self-build BNG exemption and the appellant relied on the exemption from statutory biodiversity net gain.

In this replacement dwelling appeal, the Council questioned whether the undertaking was properly enforceable because another party remained registered with an interest in the land.

The Inspector accepted evidence that the appellant was now the only party with the beneficial interest. Although another name remained on the Land Registry title until the transfer was registered, that party could no longer carry out the development, dispose of the site to someone else or derive a benefit from it.

Inspector Alice James concluded: “I am satisfied that the UU is enforceable and can be relied upon in this circumstance.” The case is therefore a useful practical example of the distinction between the registered title position and the beneficial ownership position where a planning obligation is being tested on appeal.

Why the BNG timing matters

This replacement dwelling appeal concerns a 2025 application, rather than a new application made after the rules changed. The 2026 BNG amendment and transitional regulations removed the self-build exemption from 6th August 2026 but preserve its application to qualifying earlier applications. The October appeal decision could therefore still rely on that route.

For applications made on or after 6th August 2026, self-build status alone no longer provides this exemption. However, a separate exemption now covers sites no larger than 0.2 hectares where development does not impact an onsite priority habitat. The government’s BNG exemptions guidance explains the current position.

Conditions were tested rather than copied

The Inspector also rationalised the Council’s suggested conditions. The permission carries 13 conditions covering the approved plans, materials, construction management, drainage, landscaping, cycle and refuse storage, water efficiency, glazing, fire safety and ground stability.

The construction method statement, drainage scheme and ground stability survey must be approved before development begins. The construction condition expressly includes demolition.

Other suggested controls were rejected. A condition requiring compliance with Building Regulations optional requirement M4(2) was unnecessary because the approved design already complied with it. A condition preventing future roof areas from becoming balconies or roof gardens was also rejected because that possibility was hypothetical and the approved plans did not show such uses.

The garden room was tied to the main dwelling so that it could not drift into a separate independent use.

Condition 11 requires upper-floor side-elevation windows, including those in roof slopes, to have obscure glazing and opening restricted to 150 mm unless the opening parts are more than 1.7 metres above floor level. This is the wording in the imposed schedule, which is more precise than the fixed-shut shorthand in the reasons.

What the appeal means for replacement dwelling cases

The Croydon replacement dwelling appeal demonstrates that percentage increases in size do not decide character questions on their own. The correct assessment remains contextual: plot size, spacing, street rhythm, neighbouring building scale, roof form, setback and landscaping all matter.

It also underlines the importance of getting self-build obligations right where they are relied upon for a specific planning consequence. The Inspector was prepared to look beyond the bare Land Registry position, but only because the evidence explained why the remaining registered interest no longer carried the practical rights that would undermine the obligation.

For me, the practical lesson from this replacement dwelling appeal is to check the application date, ownership evidence and precise exemption before choosing a strategy. This was a decision on the evidence in this case, not permission to disregard other registered interests whenever a self-build undertaking is submitted.