Loss of privacy objections and the evidence that works

An overlooking objection succeeds when it is measured and fails when it is felt. Loss of privacy is a material planning consideration, so a case officer has to take it into account, but the officer is weighing distances, angles, window positions and levels rather than the strength of the feeling behind the letter. An objection that gives the measurement from the proposed window to your patio doors, with the drawing reference it came from, changes an officer report. One that says the development will be overbearing does not.

Councils apply their own separation distances, usually in a householder design guide or a residential extensions document rather than in the local plan itself. Find that document before you write anything.

What overlooking means in planning

Planning is concerned with direct and material overlooking of private space: habitable room windows, private gardens and the areas of a garden closest to the house. It is much less concerned with views across a garden from an upper floor at an oblique angle, or with a sense of being observed from a distance.

Three separate matters often get bundled into one objection, and separating them helps:

• overlooking, meaning views into rooms or private amenity space
• loss of light, which is assessed against daylight and sunlight guidance rather than privacy standards
• overbearing effect or loss of outlook, which is about the bulk of a structure close to a boundary

They have different tests and different evidence, so address them under separate headings. Mixing them lets an officer answer the weakest point and move on.

Some things are not material at all. Loss of property value, the identity of the applicant, private rights of light, boundary disputes and covenants are all outside the planning decision, however real the grievance.

Separation distances councils apply locally

There is no national separation distance. What most English councils use is a convention of roughly 21 metres between directly facing habitable room windows at first floor level and above, and roughly 12 metres between a habitable room window and a facing blank wall or a boundary. Some authorities use different figures, some vary them by density or by town centre location, and some apply none at all in favour of a case by case judgement.

Get the actual figures from your council's supplementary planning document and quote them with the paragraph number. An objection that cites the council's own guide is answering the officer in their own language, and it has to be dealt with in the report.

Then measure. Scale the distance from the submitted block plan, state which drawing number and revision you used, and check it against the dimensions on the proposed elevations. Discrepancies between drawings are common, and pointing one out is often more effective than the distance argument itself.

Ground levels and why they change the answer

Separation distances assume two houses on roughly level ground. Where the new building sits higher, the geometry changes and the stated distance stops meaning what it appears to mean.

Ask for existing and proposed ground levels and a cross section through the two properties. If the application does not include one, say so in the objection, because a council can be asked to seek further information before determining. A rear extension built up on a plinth on a site that rises away from you produces sight lines into first floor rooms that a plan view never shows.

Levels also matter for raised decking and terraces. A platform 600 millimetres above ground level creates a standing eye height well above a 1.8 metre fence, which is why raised platforms are excluded from permitted development for extensions and often become the whole issue in an application.

Balconies, terraces and roof lights

The hierarchy is straightforward. A balcony or roof terrace is the hardest to mitigate, because people stand on it, move around and look where they like. A window is easier, because it is fixed and its outlook can be controlled. A roof light set high in a pitched roof is usually the easiest of all.

For roof lights, the usual test is the height of the cill above the finished floor. Where it sits at or above about 1.7 metres, direct overlooking is generally accepted as prevented, and that is often secured by condition.

Balconies are different. Privacy screens to the flanks can control oblique views but they cannot control the direct view forward, so the argument on a balcony is about the distance to the receptor and whether the balcony is needed at all. Juliet balconies with no standing platform raise no more issue than the window behind them.

Where the proposal is a flat conversion with a shared terrace, ask about management as well as design, since the pattern of use is what determines the effect.

Conditions that solve it

A condition works when it is precise, enforceable and permanent. The ones that hold up are:

1. Obscure glazing to a stated obscurity level, with the window fixed shut below a stated height, and a requirement that it be retained in perpetuity.
2. Removal of permitted development rights for further windows or openings in a named elevation.
3. A privacy screen of stated height, position and opacity, shown on an approved drawing, to be installed before first occupation and retained.
4. Deletion of a window or the raising of its cill to a stated height above finished floor level, secured on a revised drawing.
5. Restricting the use of a flat roof so it is not used as a terrace, along with removal of the rights that would allow a door onto it.

Note the pattern. Each one is a physical thing on a drawing, with a height, a level or a numbered specification, plus a retention requirement.

Conditions that do not

Obscure glazing is over-used and only half a solution. It cannot be applied to a window serving the only outlook of a habitable room without creating a poor internal environment, and an unfixed obscure window can be opened, which restores the view. Ask for the fixed shut element as well as the obscurity.

Planting is worse. A condition requiring a hedge or a line of trees relies on species, season, growth rate and the owner's willingness to maintain it, and deciduous screening does nothing between November and April. Treat landscape screening as a secondary benefit rather than a solution.

Vague conditions fail on enforcement. Wording that requires details to be agreed, without specifying what outcome those details must achieve, hands the decision to a later discharge application that neighbours are not consulted on.

Where a condition is offered that you think is unworkable, say exactly why and propose the wording you would accept. Officers frequently adopt a neighbour's suggested wording when it is precise.

Setting out your own measurements

A useful objection reads like a short report. Give the application reference, name the drawings you have used by number and revision, and set out:

• the horizontal distance from the proposed window or balcony to your nearest habitable room window, and to the nearest part of your private garden
• the difference in ground level between the two properties, with the source of the figures
• the cill height and the room use of each proposed window facing you
• a photograph taken from the affected room or garden, dated, with a note of where it was taken from
• the paragraph of the council's design guide that the proposal fails, and by how much

Send it inside the consultation period and ask for an acknowledgement. If the scheme is amended, the council may or may not re-consult, so ask to be notified of revised drawings.

If the application is approved and goes to appeal, the same measured material can be submitted again, and the process for commenting on a planning appeal as a neighbour is separate from the council's own consultation.

For daylight as opposed to privacy, the evidence is different again, and a Daylight and Sunlight Assessment or an Overshadowing Study is the document that carries it. And if you are the applicant rather than the objector, addressing separation distances in your own submission before anyone raises them is the least expensive way to deal with the point.

This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it.