London's protected views: the thirteen sightlines the city builds beneath

A gap in a hedge, 15.6 km from the dome

On the east side of King Henry VIII's Mound, the highest point of Richmond Park, a gap is kept in a holly hedge. Through it, down an avenue of trees, stands the dome of St Paul's Cathedral.

The Greater London Authority fixes the spot to ten centimetres. Its guidance photographs the view from grid reference 518605.8 E, 173150.4 N, camera 59.09 m above sea level, “looking through the gap in the hedge”. From there to the centre of the dome, the Secretary of State's Direction measures 15,644 metres. The guidance calls it “ten miles”; it is 9.7 miles.

The view was lost once. By the account of the Friends of Richmond Park, it disappeared behind wartime growth and was found again in 1976 by James Batten, who followed a clue on an eighteenth-century map and “forced his way through the hedge”. Today the guidance says how the trees are to be pruned: so as to keep the narrow view, “while also obscuring the existing tall buildings in the City of London”.

What lies under the line

The drawing under the map is that line seen from the side. The ground, and every roof and treetop beneath the corridor, come from the Environment Agency's laser survey, assembled from flights made between November 2016 and May 2022. Heights are stretched so that they show at all. The red line is the limit.

It leaves the Mound, crosses the Thames 5.8 km out, and passes over Fulham, Chelsea and Victoria. From Westminster it runs above the river itself for 1.2 km before it reaches the cathedral. Over Fulham the limit stands about 47 m above the ground; over Chelsea, 44 m.

Close to the Mound the park's own trees rise above the line, and at the far end so does the cathedral it is aimed at. Between them the survey finds two spots above the line: about 44 m² near Victoria Station, about 4 m over it, and about 6 m² by Blackfriars, 12 m over. It cannot say whether these were roofs, masts, or cranes on the day of the flight. Everything else under the corridor stays below the line.

The limit bends with the Earth

The viewing point is 59.1 m above sea level and the target on the cathedral 52.1 m, so a ruler laid between them slopes down by 7.0 m. But over this distance the Earth curves away under a straight line, and a sightline has to clear the ground as it really lies.

The GLA's guidance sets out a calculation, “devised by the Ordnance Survey”, that allows for the curve and for the bending of light in air. It works out as: lower the ruler by 0.0673 m, multiplied by the kilometres to the viewing point, multiplied by the kilometres to the landmark. Halfway along the Richmond line that comes to 4.1 m, more than a storey. The limit there is 51.5 m above sea level: lower than at either end.

The page of the guidance that sets this out had a mistake in its last step, and the GLA issued a corrected page in August 2015. A drawing submitted with a planning application in Camden in July 2015 used the first version; on that drawing's own measurements, the corrected formula puts the limit 2.5 m higher.

Eighty metres wide where it arrives

The corridor is a triangle with its point in the hedge. At the cathedral it is 80 m wide, with a further 35 m on each side where taller proposals must be sent for consultation. In the 2007 version of the rules it was 70 m, “two dome widths”, with nothing beside it.

The line is aimed, in the guidance's words, at the “Central axis of the dome, at the base of the drum”: 52.1 m above sea level, the height all eight St Paul's vistas share. What it protects is the drum, the ring of columns and the dome above them.

The guidance closes two loopholes. If a building in a corridor is demolished, its replacement must stay under the plane even where the old one did not. And “a proposal that is ‘hidden’ behind an existing building is not exempt”.

What stands behind the dome

A view can be spoiled from behind. Each vista therefore runs on past its landmark: behind St Paul's, as seen from Richmond, for 3.5 km, over Moorgate and Spitalfields to Bethnal Green. A proposal there that would rise above 52.1 m above sea level has to be sent for consultation to Historic England, the Mayor and the other councils among the ten the Direction names.

In November 2016 the Friends of Richmond Park reported that a 42-storey tower at Stratford, Manhattan Loft Gardens, “appears in the immediate background of St Paul's Cathedral”. Newham, they noted, was not among the councils the Direction names. Stratford station is about 7 km beyond the cathedral; the mapped area stopped at 3.5.

The Mayor has since sent every council a map of longer background areas, asking to be consulted on buildings proposed inside them. The GLA's draft replacement for the guidance, published in September 2026, says that “a recent development near the Olympic Park at Stratford compromised the clear reading of the silhouette of the dome”, and would write 12.5 km behind St Paul's into the rules for this view, with a new threshold there and a refusal test for anything above it that would show beside the dome.

Four hills look at one dome

From the north, the view of St Paul's is protected from four places: the viewing terrace at Alexandra Palace (9.2 km away), the gazebo at Kenwood (7.9 km), the summit of Parliament Hill (6.6 km) and the summit of Primrose Hill (5.2 km). These lines start high (Kenwood's at 114.1 m above sea level) and fall towards the cathedral.

Under the Parliament Hill line the limit stands about 50 m above the ground at Gospel Oak, 53 m at King's Cross and 42 m in Clerkenwell. Of the line from Kenwood, which crosses the same ground, the GLA's draft says that vista policies “gave rise to a consistent scale of building in the King's Cross Central redevelopment”.

Nearer the cathedral the fit gets tight. A letter from the City of London in 2005 describes an office building at New Street Square designed with “a set-back at 9th floor level”, so that the part under the corridor from Primrose Hill stays below its plane.

Parliament, seen past Euston Tower

Four vistas end at the Palace of Westminster: two from Parliament Hill, one from Primrose Hill, one from the bridge over the Serpentine in Hyde Park. The one from Primrose Hill is 300 m across where it reaches the Palace, the widest of the thirteen.

A corridor protects what can still be seen; it does not clear what was built before it. The guidance describes the view from Parliament Hill as it is: the Palace “is positioned behind the Euston Tower and the BT Tower. Only the Central Lobby Lantern and the Victoria Tower are visible.” In the side view, 4.1 km from the summit, the survey's highest return is 150 m above sea level against a limit of 70 m: the edge of Euston Tower.

Of the three lines over the West End, the one from Primrose Hill is the lowest: about 34 m above the ground at St James's. Along it, leaving out the 300 m at each end, the survey finds existing roofs above the plane over 4.0% of the corridor's area, the largest share among the long corridors.

From Greenwich, two limits and a bridge

Two vistas come from the south-east: from beside the statue of General Wolfe in Greenwich Park and from Blackheath Point. The Greenwich one is built unlike the rest. As far as a line drawn through Tower Bridge, 6.0 km out, its limit is level at 30 m above sea level, 18.8 m below the viewer's eye. West of the bridge it steps up to 50.6 m and rises to 52.1 m at the cathedral.

The guidance gives the reason: the threshold “acknowledges the visual relationship” between Tower Bridge, the Monument and St Paul's.

A level limit over low ground is a tight one. At Canada Water the ground is about 2 m above sea level, which leaves about 28 m under the line.

The shortest crosses the river to the Tower

The thirteenth vista is 353 m long. It runs from The Queen's Walk, at the foot of the path from Potters Fields, to the White Tower, and the guidance draws its limit level at 6.1 m above sea level, the height of the viewer's eye on the riverside walk. The Direction goes further: any building proposed in this corridor has to be consulted on, whatever its height. Behind the Tower the limit climbs from 25.7 m to 164.6 m in 2.5 km.

The next shortest starts at Westminster Pier and looks 2.2 km downriver to St Paul's, its limit rising from 8.4 m at the pier. The guidance notes what crosses it: “the capsules” of the London Eye “skimming the dome of the Cathedral”.

The Cheesegrater leans for a different view

The best-known story about the skyline is that the Leadenhall Building slopes to stay out of a protected view of St Paul's. It does slope for St Paul's. Its architects write that the “tapering profile is prompted by a requirement to respect views of St Paul's Cathedral, in particular from Fleet Street”.

That view, from the pavement of Fleet Street, is protected by the City of London in its own planning documents. It is not one of the thirteen. No vista passes over the site: the nearest corridor runs 490 m away. The same Fleet Street view is on record as shaping the neighbours: 52 Lime Street “leans away” so as to be hidden behind the dome, and City and GLA reports tie 100 Leadenhall Street, 8 Bishopsgate and 1 Undershaft to it as well. 22 Bishopsgate stands outside that strip of sky: the City's report says it “would not encroach upon the area of sky” between its neighbours and the cathedral, and the GLA's notes that its site “is not over-sailed by any strategic viewing corridors”.

The corridors are one reason the cluster stands where it does. The City's Local Plan refuses tall buildings in “St. Paul's protected vista viewing corridors” and in the St Paul's Heights area, and says the eastern cluster “has fewer constraints”.

The Shard stands behind St Paul's as seen from Parliament Hill and Kenwood, inside the area the rules now map. The 2003 decision that approved it held that it “would not reduce the visibility or setting of St Paul's”. Today's guidance says its shape gives “a strong orientation point” for finding the cathedral.

Above the line: refused in the corridor, weighed beside it

The limit does not mean the same thing everywhere. A proposal that rises above it, anywhere in a vista, has to be sent for consultation to Historic England, the Mayor and the other councils along the line. In a viewing corridor the London Plan adds a blunt test: development that exceeds the threshold height “should be refused”. In the strips beside a corridor, and in the area behind the landmark, there is no such test; the design is judged on what it does to the view.

How exact is it? A Camden planning report on an office scheme in Tottenham Court Road, under the line from the oak on Parliament Hill to Parliament, gives the limit across the site as 58.95 m above sea level. The proposed parapet stood at 59.01 m: 60 millimetres over. The lift housings were 1.19 m over. Officers judged the 60 mm “not material”, called the breaches together “minor incursions” and recommended approval. The report does not say how its figure was worked out; by the guidance's corrected method, the limit at that street address comes out at about 58.2 m, some 0.7 m lower.

95.7% of Greater London's postcodes lie outside all thirteen vistas. That is not a licence to build tall. The other 17 of London's 27 designated views have no measured corridor but are assessed all the same, the City keeps its St Paul's Heights, and each borough has views and height policies of its own.

From a gentleman's agreement to grid references

1938. The City of London starts to apply the St Paul's Heights, devised by the cathedral's surveyor, W. Godfrey Allen, after new tall buildings “such as Unilever House and Faraday House” had blocked well-known views. For decades they run on “a gentleman's agreement between the City Corporation and developers”.

1991. Government guidance protects ten strategic views of St Paul's and the Palace of Westminster. 2007. The Mayor's London View Management Framework replaces it, with 26 designated views and a first vista to the Tower. 2009 to 2010. The Greenwich vista, corridor and side strips together, is widened, in the GLA's words, “from 210m in 2007 to 300m”. 2012. The Directions in force today are signed on 15 March.

2026. A replacement for the guidance is out for consultation until 4 December. It adds a vista to the Tower from the site of Old London Bridge and redraws the areas behind most of the vistas. The draft London Plan, alongside it, proposes a twenty-eighth view, from Trafalgar Square to the Palace of Westminster, in place of the one from the oak on Parliament Hill. Until these are adopted, and unless the Secretary of State changes the Directions, the thirteen lines on this page are the ones that apply.