Airspace Surveyor in London

An airspace development creates new homes by building above an existing roof. London has more of these schemes than anywhere in the UK, driven by housing pressure, ageing post-war stock with structural reserves, and policy support for upward extension. Our role covers the existing residents below the development, the schedules of condition that record each flat before construction starts, and the day-to-day liaison through the build.

Specialist Airspace Surveying Across London

London's airspace work splits across three main project types. Rooftop additions on post-war and 1960s residential estates account for the largest share, with the densest concentrations in inner east boroughs like Tower Hamlets, Newham, Hackney, and Barking and Dagenham, alongside significant volumes in Southwark, Lambeth, Wandsworth, Lewisham, Greenwich, and outer boroughs from Croydon to Enfield. Rooftop additions on mansion blocks come forward across the inner west and north, particularly through Kensington and Chelsea, Westminster, Camden, Brent, Kilburn, Cricklewood, and parts of Wandsworth, Hammersmith and Fulham, and Richmond. Upward extensions on individual terraced and semi-detached homes are common across the outer boroughs.

Our London office at 2-6 Boundary Row in Southwark covers the whole capital. We specialise in chartered surveying on dense urban sites where rooftop and upward extension schemes are most common. The practice is RICS regulated with over 30 years of combined residential extension and rooftop experience, including party wall services that almost always accompany the airspace work itself.

Airspace Developments

As well as providing daylight, sunlight and rights of light advice, our role would be to make contact with the occupants of the existing building to establish any concerns regarding the development. We will work closely with the professional team to identify the initial questions and look at how these can be addressed.

It is our experience that maintaining the same point of contact for the duration of the project offers the existing occupants’ reassurance and continuity.

Services Provided

  • Make initial contact with existing occupants.

  • Attend meetings to discuss any concerns of the existing occupants.

  • Recording Schedules of Condition of the flats below the proposed units.

  • Act as a liaison between the developer and occupants throughout the project.

  • Assist in resolving any issues that may arise such as car parking, site setup etc.

What does our airspace service across London cover?

On rooftop additions to post-war estates and mansion blocks, the existing occupants liaison role is central. We make initial contact with each leaseholder below the proposed units, attend meetings to discuss concerns, prepare Schedules of Condition for the flats directly below the new units, and act as the named point of contact through construction. Day-to-day issues, scaffolding placement, deliveries, parking restrictions, access, and noise, get handled as they arise.

On homeowner-led upward extensions, the focus shifts to the Party Wall etc. Act 1996, neighbour relations, rights of light risk on adjoining homes, and protection of the existing structure. Notices are served on every adjoining owner where a party wall is involved. Daylight and sunlight reports almost always accompany rooftop applications given the impact of new height on surrounding residential windows.

Airspace work across London typically sits alongside daylight and sunlight, rights of light, and party wall workstreams on the same scheme. The same surveyor stays on the project from instruction to handover.

Over the past four years, CHP have worked very successfully with us in their capacity as party wall surveyors. Through his calm, sensible approach and excellent communication skills James Crowley, in particular, gained the trust and confidence of the entire team and stakeholders. Looking forward to working with CHP again.”

- Clare Goggin, Jackson Coles

Why instruct an airspace surveyor in London?

Airspace schemes carry more risk than a standard extension because the building below is occupied and the work happens at height. A dedicated surveyor takes the relationship with existing residents off the developer's plate, manages the party wall process where it applies, and gives the project a structured route through the planning and construction phases. Outcomes include programme certainty, fewer damage claims, and planning sign-off without late objections from neighbours.

Strategic planning policy across London sits with the Greater London Authority, but planning decisions on individual airspace schemes are taken by the 33 borough-level planning authorities. These include the London Borough councils of Barking and Dagenham, Barnet, Bexley, Brent, Bromley, Camden, Croydon, Ealing, Enfield, Hackney, Hammersmith and Fulham, Haringey, Harrow, Havering, Hillingdon, Hounslow, Islington, Lambeth, Lewisham, Merton, Newham, Redbridge, Southwark, Sutton, Tower Hamlets, Waltham Forest, and Wandsworth, alongside the Royal Boroughs of Greenwich, Kensington and Chelsea, Kingston upon Thames, and Richmond upon Thames, plus the City of London Corporation and Westminster City Council. Rights of light assessments run in parallel. A free initial assessment covers feasibility on a specific site.

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Head Office
2-6 Boundary Row
London, SE1 8HP

Essex Office
2-6 Boundary Row
London, SE1 8HP


020 3714 4090

Get in touch.

Head Office
2-6 Boundary Row
London, SE1 8HP

Essex Office
2nd Floor, 10 High Street
Wickford, Essex
SS12 9AZ


020 3714 4090
enquiries@chpsurveyors.com