Loss of existing homes and London Plan Policy H8

London Plan Policy H8 resists the loss of existing homes, and it applies to far more than estate regeneration. Any scheme that reduces the number of residential units on a site, including knocking two flats into one, falls within it. The policy expects loss of existing housing to be resisted unless the housing is replaced by better quality accommodation providing at least an equivalent amount of residential floorspace, and boroughs add their own tests on top. For anyone looking at the loss of existing homes in London, the arithmetic that matters is units, floorspace and habitable rooms, measured three ways and reported separately.

What counts as a loss of housing

A loss arises wherever the existing lawful residential use is reduced. That covers demolition of dwellings, change of use from residential to anything else, amalgamation of two or more units into fewer, and the conversion of residential floorspace to ancillary use such as a gym or a home office that is no longer self-contained accommodation.

It does not depend on whether the units are occupied. A long-empty flat is still existing housing, and the policy applies to the lawful planning unit rather than to current occupation. This catches owners who assume that an empty upper floor has somehow lost its residential status. It has not, unless a lawful change of use has occurred or the use has been abandoned, which is a high test turning on the physical condition of the property, the length of non-use, any intervening use and the owner's intentions.

Where a building contains both commercial and residential floorspace, the residential part is assessed on its own. Losing a flat above a shop is a housing loss even where the shop expands into it and the total floorspace stays the same. The point is relevant to anyone extending or altering a flat above a shop in a borough with a housing delivery shortfall.

Amalgamating two flats into one

This is the most common H8 case and the one most often mishandled. Combining two flats removes one dwelling from the supply, so the application has to confront a net loss of one unit.

Boroughs take different positions, and their local plan policy does the heavy lifting. Several resist amalgamation outright where it reduces the number of homes. Others permit it where the units being combined are below a floorspace threshold, on the logic that two substandard flats make one decent family home. A few have no specific policy and fall back on H8 and the borough's housing target.

So the first task is not writing the application. It is reading the borough's adopted local plan policy on loss of housing and any supplementary planning document on conversions and amalgamations, then checking recent decisions on similar proposals in that borough.

Three points decide most of these cases:

• Whether the resulting unit meets the housing quality standards in London Plan Policy D6 and the nationally described space standard, including the minimum gross internal area for the number of bedspaces.
• Whether either existing unit falls below those standards, which is the strongest argument for amalgamation.
• Whether the borough has a published floorspace threshold above which amalgamation is refused, often framed as protecting smaller units.

Do not argue that the amalgamated home is larger and therefore better. The policy counts units, and a bigger home is not a planning benefit in itself in a borough missing its housing target.

Where the policy permits a loss

Policy H8 allows loss where the replacement delivers at least equivalent residential floorspace in better quality accommodation. In practice that means a redevelopment scheme, not an amalgamation. The replacement test is about floorspace rather than unit count, which gives room to change the mix while holding the quantum.

The other route through is evidence that the existing accommodation cannot reasonably be retained. This is a technical case, not an assertion. What supports it:

1. A structural appraisal setting out the defects, their cause and the cost and practicality of repair, written by an engineer rather than a contractor.
2. Measured floor plans of the existing units with gross internal areas, room-by-room, against the space standard.
3. A daylight assessment of the existing habitable rooms where the argument rests on poor internal conditions.
4. Evidence on access, means of escape and the practicality of bringing the units to current standards.

Condition arguments fail when they are vague. A statement that the flats are in poor repair carries no weight. A Structural Survey quantifying what is wrong, with photographs and a repair cost, is a different proposition, and councils engage with it.

Measuring floorspace, units and habitable rooms

Report all three. Boroughs monitor housing delivery in units, the London Plan replacement test is framed in floorspace, and many borough policies on amalgamation and subdivision count habitable rooms.

Measure gross internal area to a consistent basis and say which one you used. State the existing and proposed unit mix by bedroom count. Count habitable rooms on the borough's own definition, which usually excludes kitchens below a stated size, bathrooms and circulation. Where a borough's definition differs from the one you used, say so and give both figures.

A table in the planning statement, with existing and proposed side by side and the net change in each measure, prevents the officer from doing the arithmetic differently and reaching a worse answer.

Conditions and obligations that follow

Where a borough does permit an amalgamation, expect a condition restricting future subdivision without a further permission, or an obligation to the same effect. Read it carefully. A condition removing permitted development rights or tying the two units together as a single planning unit has consequences for any later sale or reconversion.

Redevelopment schemes that engage the replacement test commonly attract obligations on the affordable element, phasing to avoid a period with no housing on site, and a mechanism securing the replacement floorspace. Policy H8 also carries specific requirements where affordable homes are lost on estate redevelopment, including replacement of affordable housing floorspace, so a scheme touching social housing needs that part of the policy read in full.

Putting the application together

A loss of housing application stands or falls on the evidence base rather than the design. The pack usually runs to a planning statement addressing H8 and the borough policy explicitly, measured existing and proposed plans with areas, the condition evidence where relied on, and a statement of the housing delivery context in that borough.

Scale brings more. Anything crossing the major threshold draws in the wider evidence base, and a scheme optimising site capacity under Policy D3 will need the design-led justification alongside the housing arithmetic. Where the building is a public house, a separate protective policy applies and the housing analysis is only half the case, as protecting public houses in a London application sets out.

Deal with H8 in its own section, quote the policy, give the figures, then address the borough policy. An officer who has to hunt for the net change in units will assume the worst.

PlanScope can draft the Planning Statement and the supporting documents for a loss of housing application, with the policy structure set out and the figures flagged where they need confirming. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it.