Double-storey extension in Birmingham
Do you need planning permission for a double-storey extension in Birmingham? In many cases, yes. Permitted development covers a rear extension of more than one storey only where it is at least 7 metres from the rear boundary and no higher than the existing roof, which is why many double-storey schemes go to the council for permission.[1] Birmingham decided 1,971 householder applications in the 12 months to 30 June 2026 and granted 86.6% of them.[2]
Local rules for a double-storey extension in Birmingham
- The national Planning Data platform lists at least 11 Article 4 areas in Birmingham that remove the permitted development right to extend a house (Part 1 Class A).[3] Councils publish this data voluntarily, so the count may be incomplete; check your own address before relying on permitted development.[3]
- Birmingham publishes a householder validation checklist, and an application that does not meet it may be declared invalid.[4]
- Birmingham requires a CIL form for any full application that creates a new dwelling, over 100 sqm of new floorspace or 100 sqm of change-of-use floorspace.[4]
How Birmingham handles these applications
Of the 1,971 householder applications that Birmingham decided between July 2025 and June 2026, 265 were refused and 1,706 granted, which is 86.6%.[2] The count includes every kind of householder work. The share decided within 8 weeks, which we worked out from the same table and which excludes applications on an agreed timescale, was 83.1%.[2]
Cabinet approved the Publication Plan for the new Birmingham Local Plan on 28 July 2026 for submission to the Planning Inspectorate in late 2026; the new plan guides development up to 2044.[5]
Average prices in August 2026 were £444,169 for a detached home and £276,268 for a semi-detached one.[6] Extending is one option to weigh against moving.
What it costs
Our fixed price for a double-storey extension is £3,000 (VAT_WORDING_TBC), and the fee charged by the council is paid on top.
Asking for the proposal costs nothing, and ordering is a separate step.
Charges and fees that come from the council or from national rules:
- Birmingham's pre-application advice for householder schemes costs £166.80 including VAT for written advice only, or £332.40 if a meeting is requested (2026-27 charges).[7]
- Separately, the statutory planning fee set nationally for a householder extension or alteration is £548 from 1 April 2026.[8]
What the work looks like
Questions people ask
What share of householder applications does Birmingham approve?
For the 12 months to 30 June 2026 the PS2 table gives a householder grant rate of 86.6% in Birmingham.[2] It is an average across every kind of householder application.
Does a CIL form come with a double-storey extension in Birmingham?
Only where a full application creates over 100 sqm of new floorspace, over 100 sqm of change-of-use floorspace or a new dwelling.[4]
Will a double-storey extension in Birmingham definitely get approved if Plandome prepares it?
No. Plandome prepares the application, but Birmingham decides it, and no consultant can promise the outcome.
Does this page replace checking my own property?
No. It summarises published sources as they stood on 14 November 2026. Your property may be subject to conditions or designations that a general page cannot cover.