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Blackburn Planning Applications: A 2026 Guide for Blackburn with Darwen

Bhavesh Ramburn

Blackburn planning applications: which authority handles yours?

If you are searching for a planning application in Blackburn, Darwen, or anywhere in the former Blackburn with Darwen district, the responsible Local Planning Authority (LPA) is Blackburn with Darwen Borough Council. The council is a unitary authority in Lancashire and is not part of the wider Lancashire County Council planning framework. The planning service can be accessed via the Planning service page.

Blackburn with Darwen has a substantial textile-mill heritage, a large residential population centred on the two towns, and a number of conservation areas. It is one of the more active planning authorities in the North West by volume of small applications.

How the English planning system applies in Blackburn with Darwen

Blackburn with Darwen is in England, so the primary statute is the Town and Country Planning Act 1990, supplemented by the Town and Country Planning (General Permitted Development) (England) Order 2015 (the GPDO) which grants Permitted Development rights for certain categories of building work.

For most residents this means:

  • Permitted Development allows a range of small extensions, outbuildings, and alterations without a formal application, subject to the GPDO limits and any local restrictions.
  • Anything outside PD requires a formal application to Blackburn with Darwen Borough Council, determined under the planning policies published on the council’s planning page.
  • Applications are submitted through the Planning Portal, which hosts the standard 1APP forms and the fee calculator.

For the broader PD framework that governs what you can build in Blackburn without applying, see our guide on Permitted Development Rights in 2026.

How to view or comment on a current Blackburn planning application

Public access to the live application register is a statutory right under the Town and Country Planning Act 1990. Blackburn with Darwen operates a single search portal for all live and decided cases:

You can also use the Planning Portal for national searches. Members of the public have at least 21 days from the date an application is advertised (site notice and/or neighbour letter) to submit written comments. Comments must relate to material planning considerations — impact on amenity, design, traffic, ecology, residential amenity, heritage, or compliance with the local development plan. Comments that are vexatious or relate solely to private disputes (boundary walls, party walls, loss of a view) cannot be taken into account.

For householder-specific application types and the typical application forms used in Blackburn, the council publishes a dedicated planning permission for householders guide.

Retrospective planning applications

A retrospective application is a planning application made after the work has been carried out. It is the standard route to regularise work that was either outside Permitted Development or done without a required planning consent.

Blackburn with Darwen processes retrospective applications under the same procedural and fee rules as ordinary applications. Three practical points:

  • No automatic penalty. A retrospective application is treated as a fresh application. The local authority cannot refuse to consider it on the basis that the work has already been done. However, an Enforcement Notice may be issued in parallel where the work is unauthorised, and any fees, fines, or restoration orders apply on their own track.
  • Twice the standard fee in some cases. Where an application follows an Enforcement Notice, the application fee is doubled under the Town and Country Planning (Fees) (England) Regulations 2012.
  • Higher evidentiary burden. The council may ask for additional drawings, photographs, and a written statement explaining why the work was carried out without prior consent.

Common retrospective-application scenarios in Blackburn include shopfront and signage changes, single-storey rear extensions built without prior approval, and the conversion of a single dwelling (Class C3) to a small HMO (Class C4) without the Article 4 Direction consent that Blackburn has in force across much of the borough.

Application fees and statutory timelines

Application fees in England are set centrally by the Town and Country Planning (Fees) (England) Regulations 2012 (as amended). Indicative fees for the most common Blackburn application types in 2026:

  • Householder application (extensions and alterations to an existing dwelling): £258.
  • Full planning permission for a new dwelling: £541 plus £162 for each additional dwelling.
  • Change of use: varies by class, typically £541 or higher.
  • Prior notification / prior approval (where applicable under the GPDO 2015): £120.
  • Listed Building Consent (where the property is statutorily listed): £293.
  • Retrospective application following an Enforcement Notice: standard fee doubled.

The statutory determination period is 8 weeks for householder and most local applications under the Town and Country Planning Act 1990, and 13 weeks for major developments (defined under the Town and Country Planning (Development Management Procedure) (England) Order 2015). Blackburn with Darwen generally meets these targets but can extend via a further-information request that pauses the clock.

When you need full planning permission in Blackburn

You will need a full application if you are:

  • Building a new dwelling or commercial building.
  • Converting a single dwelling (C3) to a small HMO (C4) — much of the borough is covered by an Article 4 Direction.
  • Altering or extending a listed building — Blackburn and Darwen have a substantial stock of listed mill buildings and chapels. Listed Building Consent is a separate application that runs in parallel.
  • Working in a Conservation Area, where many PD rights are withdrawn.
  • Working in a flood risk zone — parts of the River Darwen and River Blakewater corridors are in Flood Zones 2 or 3 and require a Flood Risk Assessment.
  • Carrying out retrospective work — see the previous section.

For an England householder context (extensions, alterations, outbuildings) — which is the most common Blackburn application type — see our guide on householder planning permission for a garden office.

Next steps and resources

Editorial note. This article is for guidance only and does not constitute regulated advice. Blackburn with Darwen is a unitary authority in Lancashire and operates its own planning service separate from Lancashire County Council. For project-specific questions, consult a chartered planning professional registered with the Royal Town Planning Institute (RTPI).