Loft conversion drawings in Finchley, N3
A loft conversion in Finchley begins with one question: does the extra roof space stay within permitted limits, which are 40 cubic metres for a terrace and 50 cubic metres for any other house. DrawingsDirect draws loft conversions for N3 homes from £695.
Fixed fee from £495 drawings + £200 survey (£695 total) · all prices
Prefer to talk it through?
Measure the roof space before choosing a loft type
The permitted development allowance counts the volume you add to the original roof, so the type of loft you pick changes the sum. A roof-light conversion adds almost nothing. A rear dormer adds a lot. A hip-to-gable swaps a sloping end for a vertical one and adds a different amount again.
The limits are in Class B of Part 1 of the General Permitted Development Order: 40 cubic metres for a terrace house and 50 cubic metres for any other house. Our guide to loft conversion types compares the options, and our dormer loft conversion drawings page covers the most common one.
What Barnet's figures say about loft work in N3
Finchley is in the London Borough of Barnet. Barnet decided 1,619 certificates of lawful development across the eight quarters to 2026 Q2 (our analysis of MHCLG planning application statistics, table PS1), a sign that many owners ask the council to confirm lofts are lawful. See our lawful development certificate entry.
In the four quarters to 2026 Q2 the borough granted 80% of its householder decisions (our analysis of MHCLG planning application statistics, table PS2). That describes the past. Your outcome depends on your design and your road.
Barnet decided 1,619 certificates of lawful development across the eight quarters to 2026 Q2 (our analysis of MHCLG planning application statistics, table PS1), a sign that many owners ask the council to confirm lofts are lawful.
Article 4 directions and conservation areas around Finchley
For Barnet the national register lists 15 article 4 direction entries, possibly not a complete set (our analysis of MHCLG Planning Data Platform conservation-area and article-4-direction datasets), and 16 conservation-area entries (same analysis). Where either applies, the permitted roof allowances above may not, and you may need a full application. The government dataset is a quick first check, Barnet's conservation area map is the one to confirm against, and our Article 4 entry explains the effect.
Getting the loft drawn and priced
Our fixed fee for loft conversion drawings with roof lights starts from £695. Dormer, hip-to-gable and mansard designs are priced on the pricing page. The sets show the existing roof, the new layout, the stair position and the structure, and our guide to how long a loft conversion takes shows where drawings sit in the timeline. See the main loft conversion drawings service for the full list of sheets.
Sources
Every figure on this page, where it comes from and a link to the original.
| Figure | Source | Link |
|---|---|---|
| 1,619 | Our analysis of MHCLG planning application statistics, table PS1 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
| 15 | Our analysis of MHCLG Planning Data Platform conservation-area and article-4-direction datasets (bulk snapshot retrieved 14 Aug 2026) | www.planning.data.gov.uk |
| 80% | Our analysis of MHCLG planning application statistics, table PS2 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
| 16 | Our analysis of MHCLG Planning Data Platform conservation-area and article-4-direction datasets (bulk snapshot retrieved 14 Aug 2026) | www.planning.data.gov.uk |
| 40 cubic metres | GPDO 2015 Sch 2 Pt 1 Class B.1(d): roof space volume addition limit, terrace house (source wording: 40 cubic metres) | www.legislation.gov.uk |
| 50 cubic metres | GPDO 2015 Sch 2 Pt 1 Class B.1(d): roof space volume addition limit, any other house (source wording: 50 cubic metres) | www.legislation.gov.uk |
| £695 | DrawingsDirect starting fixed fee for loft conversion (roof light) drawings, from the published price list | drawingsdirect.co.uk |
Questions people ask
How much does a loft conversion drawing cost in Finchley?
Do I need planning permission for a loft in N3?
Does the same fee cover East Finchley and Church End?
Photographs: GRALISTAIR (CC BY-SA 4.0).
