Loft conversion drawings in Barnet from £625
Finchley, Golders Green, Barnet Vale and Mill Hill: we check whether your street has lost its roof rights, then draw the loft to Barnet’s own checklist.
£625 £475 drawings + £150 survey (£625 total), no VAT to add
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The short answer
A Barnet loft usually comes with three extras the national rules do not ask for: a roof plan, a bat roost assessment where the roof is partly removed, and a fire-safety reasonable-exception statement. We prepare them with the drawings. Our fee is £475 drawings + £150 survey (£625 total), no VAT to add; Barnet’s application fee is separate.
Loft conversion drawings
from £625
- Drawings
- £475
- Measured survey
- £150
- Total you pay
- £625
- VAT
- None to add
- A measured survey of the roof, the stair and the landing below
- A check of your address against Barnet’s conservation area Article 4 directions
- Floor plans, elevations, a roof plan and sections drawn to Barnet’s scale-bar and reference rules
- The Barnet CIL information form and the fire-safety reasonable-exception statement, filled in with the application
- A note of where a bat roost assessment is likely to be asked for
- Submission to Barnet, an independent check of every sheet and free redraws until approval
£475 drawings + £150 survey (£625 total). A starting fee: we confirm one fixed figure after checking your address. The council’s own fee, where there is one, is paid to the council.
Get my fixed feeHow a Barnet loft job runs
Address check
Ten of Barnet’s conservation areas have Article 4 directions. We place your house against them before drawing.
Survey
We measure the roof, note the trees within 15 metres, and plan where the stair will arrive.
Draw to Barnet’s list
Every sheet gets a drawing number, the site address and a scale bar of at least 5 or 10 metres, and the plans say nothing about “do not scale”.
Submit and follow
We send the application, and a case officer is assigned after validation. We answer them for you.
Hampstead Garden Suburb and the other Barnet streets without a loft right
Barnet says ten of its conservation areas are covered by Article 4 directions, and the most familiar is Hampstead Garden Suburb. Its Area 1 direction withdraws the rights to enlarge or alter a dwelling (Class A) and to make any other alteration to the roof (Class C), as well as porches, outbuildings, hard surfaces, gates, fences, exterior painting and solar equipment.
For example, a rear dormer that is permitted development under Class B in a Mill Hill semi needs a householder application in the Suburb. Elsewhere in Barnet, small HMOs have needed permission since 29 May 2016, which matters if the loft will be let.
The extras on a Barnet loft application
Barnet’s householder checklist asks for a roof plan unless the roof does not change, and a section unless the elevations barely alter. Development that removes or partly demolishes a roof will require a bat roost assessment, which is common on a loft conversion because the roof is opened up. A tree survey is needed where a tree stands within 15 metres of the work, on your land, a neighbour’s or the street.
Barnet also wants a Community Infrastructure Levy additional information form and, for fire safety, a reasonable exception statement under the London Plan fire guidance. None of this is difficult, but missing any one of them can keep an application from being validated, which is why we assemble them together.
Timing and CIL in Barnet
After validation, Barnet assigns a case officer and consults the neighbours. Cases are decided either by officers under delegated powers or at committee, depending on complexity and interest. We cannot promise a date.
Barnet’s residential CIL is £300 a square metre for permissions granted from 1 April 2022, with Mayoral CIL on top. It bites at 100 square metres of new build or a new dwelling, so a loft conversion sits outside it, but Barnet still wants the information form so it can confirm that.
Loft conversions in Barnet in numbers
1081 of 1136
Householder decisions by Barnet Council between July 2025 and June 2026 (prior approvals left out) that were made inside 8 weeks.
Source: MHCLG live table PS2, district planning application statistics, July 2025 to June 2026 (GOV.UK)
10
Barnet conservation areas that are covered by Article 4 directions, including Hampstead Garden Suburb.
Class C
Hampstead Garden Suburb’s Area 1 direction removes the right to make any other alteration to a roof.
Source: Hampstead Garden Suburb conservation area Article 4 directions (Barnet Council)
29 May 2016
Date from which a house-to-small-HMO change needs planning permission anywhere in Barnet.
Bat survey
Barnet asks for a bat roost assessment where a roof is removed or partly demolished.
Source: Validation checklist: householder application (Barnet Council)
15 m
Distance within which trees on the site, next door or on the street trigger a tree survey and must be drawn.
Source: Validation checklist: householder application (Barnet Council)
Delegated
Barnet decides applications either under officers’ delegated powers or at committee, depending on complexity and interest.
Source: What happens after an application for planning permission is made (Barnet Council)
£300
Barnet CIL per square metre for residential development granted permission from 1 April 2022.
Source: Community Infrastructure Levy (CIL) (Barnet Council)
£72.73
Mayoral CIL per square metre for permissions granted in 2026 in Barnet, which is in band 2 (£60 when set in 2019). It applies only where CIL is due at all.
Source: Mayoral CIL: Annual CIL Rate Summary 2026 (London.gov.uk)
100 m²
New-build floor area below which CIL does not arise unless the work creates a dwelling.
Source: CIL Regulations 2010, regulation 42: exemption for minor development (legislation.gov.uk)
Questions about loft conversions in Barnet
Do I always need a bat survey for a Barnet loft?
Barnet’s checklist asks for a bat roost assessment where a roof is removed or partly demolished, which describes most dormer lofts. We tell you early whether yours is likely to need one, so you can book it with the survey.
Is my road in an Article 4 area?
Ten Barnet conservation areas carry directions. Send us the address and we check it against the council’s map before we quote the route.
Why does Barnet want a CIL form for a loft?
It is on the validation checklist for householder applications. We fill it in so the council can see no levy is due.
Can I draw a loft from my own photos?
Barnet needs a scaled, dimensioned set with a reference number on every sheet, so a measured survey is the sound starting point.
Find out what your Barnet loft needs
Send the address and a photo of the back of the house. We reply with the route and a fixed fee, from £475 drawings + £150 survey (£625 total).