Rights to light
The right to light in the UK goes back to general property law relating to easements that date back to William IV. The Ancient Lights Law became superseded by the 1832 Prescription Act. NB In the USA all such rights and laws were abolished following the introduction of electric lighting.
Rights to light generally become an issue when a new development, or proposed development affects the access to light of an adjoining property. Rights to light also apply to obstructions caused by trees, hedges and so on, but there are no rights to light for open ground.
- Private nuisance regulates interference with a persons right to enjoy land, or some right in connection with that land. Such interference must be ‘unreasonable’ to constitute nuisance. Nuisance can be remedied by an injunction, abatement and / or damages.
- An easement is a a right which a person has over land owned by someone else. An easement can be created by express grant (for example it may be set out in a conveyance deed), by necessity (for example if there is only one means of access to a site) or by prescription (the act has been repeated for at least 20 years). Easements are normally attached to the land. In relation to rights to light, an easement can perpetuate even if a new building is constructed. This means that it cannot be assumed that no rights to light exist simply because neighbouring buildings appear to be new.
Generally a right to light refers to the right to receive sufficient light through an opening (such as a window), allowing ‘ordinary’ comfortable use and enjoyment of a dwelling, or ‘ordinary’ beneficial use and occupation of other buildings.
The levels of acceptable light have not been objectively quantified and are instead assessed on a case by case basis by the courts. However, “sufficient light according to the ordinary notions of mankind” and “tangible deprivation to a building” are arguable expressions that have earned substantial fees to the legal and surveying professions and given rise to specialists and expert witnesses in this field.
Much depends on:
- The measurement of light.
- Proof of its diminution.
- The damage caused by obstruction.
It is now relatively straight forward to measure, or model lighting levels on working planes within buildings and to assess whether there is currently adequate light to perform tasks such as reading, or whether there will be once a proposed development is constructed.
Natural light to a building can be achieved in different forms and provide varying light power:
- Skylights – capturing light from the higher sky
- Vertical window light – capturing light from the lower sky
- Dormer light
- Lantern light
- Sloping cove light
- Borrowed light.
Glazing can have variable translucency such as:
The obstruction of light between an internal space of the dominant property and the sky by a servient property is generally caused either by either:
- Height of an offending structure and de facto its width.
- Or proximity and de facto its width.
 Rules of thumb
The '50:50 rule' however, may be deemed adequate. This involves determining what percentage of a room receives adequate light on a working plane 850mm above the floor. An injury may be considered to have occurred where the percentage is reduced to less than 50%. Where more than 50% of the room still receives adequate light however, an injury may not be considered to have occurred, irrespective of the amount of light that has been lost.
The most likely remedy to a loss of a right to light is an injunction. Courts do not like to award damages in such cases, as this could be seen as a developer being able to ‘buy’ the rights of another. However if damages are awarded, they may be based on:
- The use and purpose (historical) of the rooms affected by the infringement.
- The loss of natural light power over the affected by the obstruction.
- The additional value to the property of the servient offender. This may be a proportion of the developers profits, where the proportion relates to the amount of floor space that the developer could not have built if they had not infringed on the right to light of their neighbour.
- Any loss of residual value to the dominant property
The law and possible remedies surrounding rights to light are not straight forward. There are complications in relation to some Crown land, statutory bodies and compulsory purchase, and under certain circumstances developers can obtain light obstruction notices. If it is possible that a development will encounter rights to light issues, a right to light consultant can be appointed to give expert advice.
In practice the dominant property by means of an interlocutory injunction can hold up a development for a very long time while it takes its case to court. Time is money and the delay while the legal case goes through the courts, particularly if it is appealed, can bring everything to a halt. So a negotiation takes place with the dominant owner’s team having a pretty good idea of the value of the infringement to the servient owner and a deal is done or the design is changed to step back any light obstructing structures.
 Recent considerations
A right to light by prescription may be lost if a person submits to a loss of light for a year before making a claim. This means that complaints should be made quickly, and repeated frequently to ensure that the right is not lost before a claim is made. However, the recent case of HKRUK II (CHC) Ltd v Heaney (2010) suggests that time may no longer be a barrier to an injunction. SeeThe In-House Lawyer: Rights of light: What you need to know post-Heaney.
See also Light obstruction notices.
In 2013, the Law Commission launched a consultation paper proposing radical reform to rights to light to prevent them from becoming an unnecessary constraint on development. The consultation ran from 18 February 2013 to 16 May 2013 (See The Law Commission: Consultation Paper No 210, Rights to Light, A Consultation Paper). The key recommendations, were published on 4 December 2014, in Final Report, Rights to Light (Law Com No 356) and included:
- A statutory notice procedure which would allow a landowners to require their neighbours to tell them within a specified time if they intend to seek an injunction to protect their right to light, or to lose the potential for that remedy to be granted.
- A statutory test to clarify when courts may order damages to be paid rather than halting development or ordering demolition.
- An updated version of the procedure that allows landowners to prevent their neighbours from acquiring rights to light by prescription.
- Amendment of the law governing where an unused right to light is treated as abandoned.
- A power for the Lands Chamber of the Upper Tribunal to discharge or modify obsolete or unused rights to light.
 Related articles on Designing Buildings Wiki
- Conservation area.
- Derogation from grant.
- Designated sites.
- Light obstruction notice.
- Light pollution.
- Lighting of construction sites.
- Listed building.
- Party Wall act.
- Quiet enjoyment.
- Restrictive covenants.
- Right of support.
- Rights of way.
- Site of Special Scientific Interest.
- Tree preservation order.
- Tree rights.
 External references
Featured articles and news
Leaps, not steps, are needed to avoid a ticking time bomb, say BRE in response to Farmer Review.
A multi-purpose hall in France covered in a translucent orange membrane.
Winning designs revealed for a rock formation-influenced residential complex in Rennes.
An article explaining the techniques, regulations and environmental impacts of carbon capture and storage.
Watch one of the first documentaries by the acclaimed Adam Curtis, examining the substandard system building of the 1960s.
Take a look at the tech start-up that could transform construction design and communication.
This house in Barcelona uses an innovative new facade tiling system to blend into the landscape.
The origins, evolution and future of Level 3 BIM.
For new and returning Urban Design students, check out our article list divided up into the modules you'll be studying.
Report states that health of urban dwellers could be significantly improved by rethinking transport design.
The Kremlin, the centre of Russian power, includes some of the country's finest architecture.