Guest post by Philip Grant in a personal capacity
Diagram showing the general proportions of tree roots to canopy. (Image from the internet)
When Martin posted a blog about the Newland Court planning application in September, you could see from the aerial view of the site for Brent’s proposed “infill” houses that they would be very close to a line of trees.
Those trees were in the back gardens of homes in Grendon Gardens, inside the Barn Hill Conservation Area. I added a comment, pointing out that those trees were protected, because they are part of the conservation area’s ‘essential character’, and Martin posted that as a separate item of useful information for Grendon Gardens residents.
Residents with trees in their gardens bordering the Newland Court site were advised to contact Brent’s Tree Protection Officer, Julie Hughes. She has submitted her comments on planning application 22/3124, and these begin by saying: ‘I have significant concerns relating to the impact that this development will have on protected trees.’ Her comments, which were only made public three weeks after she’d made them, conclude:
Final paragraph of Brent’s Principal Tree Officer on Brent’s Newland Court application.
I will ask Martin to attach a full copy of those comments below, along with a document copy of the objection comments which I’ve submitted. These also deal mainly with the harm which the planning application would do to the protected trees in the Barn Hill Conservation Area, if it were to be approved.
The Principal Tree Officer’s comments concentrate mainly on the tree canopies, the branches and leaves. Because the site of the existing garages at Newland Court is so narrow, the houses which the Council wants to build there would need most of the overhanging branches of these protected off-site trees to be cut off. The branches would, if such severe lopping did not kill the trees, grow back again, and so would need frequent cutting back, to stop them blocking the light to rear windows.
The extent of existing protected tree canopies, marked on a plan of the proposed new homes.
Because there were trees on and adjacent to the site, the planning application had to be supported by an Arboricultural Impact Assessment (“AIA”). This was prepared for Brent Council by Watermans. When I read this document, one short extract about the trees along the southern edge of the conservation area stuck in my mind:
‘… it is considered that their roots are unlikely to have extended below the existing retaining wall which forms the northern boundary of the Site. It is therefore considered that they are unaffected by the development proposals.’
I don’t claim to be an expert on trees, but you don’t have to be one to know that where a tree has a canopy above ground, it is likely to have roots in the ground below that canopy! [See the diagram above.] It is very convenient for the Council’s plans to assume that there would be no roots from the protected trees where you want to dig foundations and build houses. But how likely is it that a brick wall would prevent all tree roots from growing beyond ‘the northern boundary of the Site’?
Luckily, I remembered a similar situation which occurred as part of the Morland Gardens planning application, where there were trees in a next-door garden, just beyond a retaining wall which marked the site boundary. In that case, the AIA included the results of a ground penetrating radar survey. This discovered that tree roots did extend below the wall:
‘The scan line results showed that the off-site trees are rooting within the site, but that the physical barrier of the retaining wall and its footings has provided a partial barrier to root encroachment.’
That evidence (rather than the “convenient” assumption by the authors of the Newland Court AIA) meant that the building plans at Morland Gardens had to include a two metre wide tree protection strip, inside the site boundary, where no construction was allowed. But the Newland Court site is so narrow that some of the proposed new houses have walls only 50cm from the boundary. These would cut through both the support and feeder roots of protected trees.
On the evidence in my objection comments, it would not be possible to build six of the seven houses without seriously harming, or killing off, both the canopies and the roots of protected trees in the Barn Hill Conservation Area. I’ve sent a copy of my comments document to Brent’s Principal Tree Officer, and asked her to consider it and give her response to Brent’s Planning Officers (as well as to me).
If I’m correct, then this planning application should be refused (and there are plenty of other reasons put forward by local residents which also justify its refusal). This is a Brent Council application, but that should not make a difference.
Regular readers of “Wembley Matters” will know of my recent battle with the Council over another “infill” scheme at Rokesby Place, and my insistence that Brent’s Planning Officers must be seen to uphold the Local Government Association’s “Probity in Planning” rules:
‘Proposals for a Council’s own development should be treated with the same transparency and impartiality as those of private developers.’
Would Brent allow an application by a private developer to build houses so close to a conservation area that it damaged or killed protected trees? I doubt it!
Philip Grant.
Philip Grant's Objection
Brent Tree Officer's Report
