UKTC Archive

RE: Drop kerbs

Subject: RE: Drop kerbs
From: Jasper Fulford-Dobson
Date: Dec 28 2018 10:14:55

I've had the same issue to deal with before. 

Avenue of TPO limes on a narrow semi-rural residential road with large 
detached houses, many of which had been rebuilt or in-filled over the 
previous years, with 2-3 dropped kerbs between the trees setting the 
precedent. LPA's tree officer pointed out that the other examples had been 
done before the 2012 revision of BS5837 so "precedent" could not be used as a 
viable justification, raised concerns about how the levels would match 
("no-dig" construction to ramp up over the RPA from the existing road level), 
suggested the trees would be adversely impacted and objected with no room for 
manoeuvre. The application was refused and the client wasn't prepared to test 
this at appeal.

Suffice to say (as others have experienced) all trees near the pre-2012 
dropped kerbs are in fine and healthy condition, despite the level changes 
being very subtle.

Despite the expectations of some, as arb consultants all we can do is try and 
help guide the process by setting out the principles to take to reduce the 
impact on trees. Make sure you re-read Tree Roots in the Built Environment, 
BS 5837, APN12, Built Environment ( and Geosynthetics info/case 
studies then consider the special engineering solutions available that might 
help overcome or mitigate your problem. Put these forward to your client's 
designers making it clear you are not an engineer or landscape architect and 
advise them to prepare additional cross sectional drawings (before and after) 
showing the built structure and the level changes, especially how they can be 

Good luck.


-----Original Message-----
From: <> 
On Behalf Of Paul Hawksford
Sent: 24 December 2018 22:09
To: UK Tree Care <>
Subject: Drop kerbs

I've a site with a proposed residential dwelling, unfortunately, the 
architect also proposes a couple of drop kerbs in the public footpath outside 
leading into the access driveway. The kerb would be sited within the RPA of 
two nice mature lime trees which sit in the footpath. Drop kerbs have been 
installed in the same area, some ten years ago and very close to similar 
trees along the road and he's hoping this will help the application. I've 
dealt with drop kerbs before and viewed them with a cautious eye, 
consequently, I told those architects it would be difficult to convince 
planners that it could be done sympathetically. Has anyone experience, or 
produced a method statement for this...?


Paul Hawksford
Principal Arboriculturist

16 Ballydonaghy Road

County Antrim
BT29 4EP

M: +44 (0)7746 XXXXXX


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