Knowledge Base
Planning, regulations and construction, explained.
Topic 04
Conservation areas, listed buildings and other constraints
Designations on a property change what can be built and what the council asks for.
17 articles
Finding out what applies
Conservation areas
02Am I in a conservation area, and what changes if I am?Your council's conservation-area boundary map confirms whether your property is included. Conservation-area status changes some permitted development rights and how proposals are assessed, but it does not make every building listed or prohibit all alterations.03Extensions and loft conversions in a conservation areaExtensions and loft conversions can be possible in a conservation area, but several ordinary householder permitted development routes are restricted. A modest single-storey rear extension may still qualify; side extensions, two-storey rear extensions and roof enlargements require a different planning assessment.04Windows, doors, roofs and front gardens in a conservation areaConservation-area status does not automatically require permission for every replacement window, door or roof repair. The answer depends on the work, whether the property is a house or flat, listed status, and any Article 4 direction; front-garden paving and boundary works need their own checks.05Demolition in a conservation areaDemolishing an unlisted building in a conservation area can require planning permission even when demolition elsewhere would follow a simpler route. Check the building's size and status, the exact work and any other controls before starting; an exemption from conservation-area demolition control is not a universal permission to demolish.06Trees in a conservation area: the 6-week noticeNormally, give the council six weeks' written notice before cutting down or carrying out relevant work to a qualifying tree in a conservation area that is not already protected by a TPO. The notice gives the council time to decide whether to protect the tree; it is not the same as a TPO consent application.
Listed buildings
07Is my building listed, and what do Grade I, II* and II mean?Search the National Heritage List for England and read the entry for the building or group of buildings. Grade I identifies exceptional interest, Grade II* identifies particularly important buildings of more than special interest, and Grade II identifies special interest; all three grades can require listed building consent for relevant works.08What needs listed building consent?Listed building consent is required to demolish a listed building, or to alter or extend it in a way that affects its special architectural or historic character. It can apply to internal work and protected associated structures, even where a separate planning application is unnecessary.09Unauthorised works to a listed building: the risksCarrying out listed-building work that needs consent without obtaining it can lead to prosecution and a requirement to restore the building. There is no ordinary planning-style time limit that makes unauthorised listed-building alterations safe simply because they are old.10Locally listed buildingsA locally listed building is recognised for its local heritage interest but is not nationally listed merely because it appears on the council's list. Local listing is relevant to planning decisions; it does not by itself create the separate listed building consent procedure.
Article 4 directions
11What is an Article 4 direction, and how do I check for one?An Article 4 direction removes specified permitted development rights within a defined area or at particular properties. It usually means an application is needed for the development described in the direction, not that the work is banned or every permitted development right has disappeared.12Common Article 4 directions in London: HMOs, offices to homes, basements, conservation areasLondon councils use Article 4 directions for several different purposes, including small HMOs, commercial-to-residential changes, basement works and conservation-area alterations. There is no single London-wide direction covering all four: check the current instrument, map and effective date for the particular property.
Other constraints
13Green Belt and Metropolitan Open Land: what can be builtGreen Belt and Metropolitan Open Land are strongly protected, but neither designation is an absolute ban on building. The answer depends on the existing lawful building, the proposed development and the relevant national and local policy tests; calling land 'grey belt' does not itself give permission.14Flood zones and critical drainage areasFlood zones describe river and sea flood probability, but they are only one part of the planning check. Surface water, groundwater, future climate-related risk and locally identified drainage problems can also require assessment, including on sites in Flood Zone 1.15Tree Preservation OrdersA Tree Preservation Order protects the trees identified by the order, and consent is normally needed before carrying out prohibited work to them. Check the order and its plan before pruning, felling or excavating nearby; conservation-area notice is not a substitute for TPO consent.16Archaeological Priority AreasAn Archaeological Priority Area identifies land where archaeological interest or potential should be considered in planning. It does not automatically prevent development or mean every project needs an excavation; the evidence required depends on the site's potential and how much ground the works would disturb.17Bats, nesting birds and other protected speciesProtected-species duties can apply to ordinary homes and gardens, not just designated wildlife sites. Check likely impacts before roof work, demolition, tree work or habitat clearance; planning permission, permitted development and a Biodiversity Net Gain exemption do not by themselves authorise harm to protected wildlife.