Planning Permission

Definition and Statutory Context#

In the context of the UK built environment, planning permission is the official consent granted by a Local Planning Authority (LPA) to carry out development. Under the Town and Country Planning Act 1990, "development" includes the carrying out of building, engineering, or other operations in, on, over, or under land, as well as making any material change in the use of any buildings or other land.

For projects involving the external wall system (EWS) of a building—such as the repair, replacement, or wholesale remediation of cladding—planning permission represents the regulatory gateway through which the aesthetic and environmental impact of the works is governed. While Building Regulations focus on how a building is constructed (including structural integrity and fire safety), planning permission focuses on the principle of the development and its impact on the surrounding area.

Material Changes to the External Wall#

A critical factor in determining whether cladding works require planning permission is whether the proposed changes constitute a "material effect" on the external appearance of the building. Section 55(2)(a) of the Town and Country Planning Act 1990 generally excludes works that affect only the interior of the building or do not materially affect the external appearance.

However, cladding remediation often involves significant changes to the building’s fabric. Even if the primary objective is to improve fire performance or thermal efficiency, the replacement of panels, the introduction of new insulation depths, or a change in the colour and texture of the finish may be deemed a material change. If the new cladding system differs in appearance from the original—for instance, replacing a high-pressure laminate (HPL) with a metal composite material (MCM) or a mineral-based render—the LPA typically requires a full planning application or, in specific circumstances, an application for a non-material amendment.

Permitted Development Rights and Limitations#

Certain types of minor improvements may fall under "Permitted Development" (PD) rights, which allow specific works to proceed without a formal planning application. However, the application of PD rights to large-scale cladding replacement on multi-storey residential blocks or commercial buildings is highly restricted.

For most high-rise residential buildings undergoing remediation, the assumption in the industry is that a planning application will be necessary unless the LPA provides a written "Certificate of Lawfulness" confirming otherwise.

The Relationship Between Planning and Building Control#

It is vital to distinguish between planning permission and Building Regulations approval. While the two processes often run in parallel, they are governed by different legislation and different departments within (or external to) the local authority.

1. Planning Permission: Concerned with land use, appearance, massing, and the impact on the local character.
2. Building Control: Concerned with the technical performance of the cladding system, including Requirement B4 (External fire spread) and Requirement L (Conservation of fuel and power).

Securing planning permission does not guarantee that the proposed cladding system meets Building Regulations. Conversely, a system that is technically compliant with fire safety standards may be rejected by planning officers if the visual finish is deemed inappropriate for the local context. Coordination between these two disciplines is a standard component of professional project management in cladding replacement schemes.

Responsibilities of Building Owners and Managers#

Building owners, Freeholders, Residents' Management Companies (RMC), and Right to Manage (RTM) companies hold the ultimate responsibility for ensuring that all necessary consents are in place before works commence. Proceeding with cladding replacement without the required planning permission can result in an enforcement notice, which may require the building to be returned to its original state at the owner’s expense.

Professional consultants, such as architects or planning consultants, are typically engaged to manage the application process. This involves the submission of detailed elevations, material specifications, and design and access statements. For buildings undergoing remediation via government funding schemes, evidence of planning progress or approval is often a prerequisite for the release of funds.

Common Misunderstandings in Remediation#

A common misconception is that if cladding is being replaced for safety reasons, planning permission is automatically granted or unnecessary. The planning system does not generally waive its requirements based on the urgency of fire safety remediation, although some LPAs may expedite the processing of such applications.

Another misunderstanding involves "like-for-like" replacement. In the context of cladding, replacing a hazardous material with a non-combustible alternative often necessitates a change in the physical properties of the panel (such as thickness or fixing methods). These technical changes can alter the shadow gaps, the profile of the facade, or the way light interacts with the surface. Even if the colour is matched, the change in material composition may be viewed as a material alteration by the LPA.

Related Terminology and Process Stages#

Several terms are frequently encountered alongside planning permission in the cladding sector:

• Pre-application Advice: A formal service offered by LPAs where developers can seek an initial opinion on their proposals before submitting a full application.
• Conditions: Requirements attached to a planning approval. For cladding, a common condition is the requirement to submit physical samples of the materials for onsite inspection before installation begins.
• Certificate of Lawfulness of Proposed Use or Development (CLPUD): A legal document confirming that a proposed change does not require planning permission.
• Non-Material Amendment (NMA): A process for making very minor changes to an existing planning permission without the need for a completely new application.
• Sui Generis: A Latin term meaning "of its own kind," used in planning to describe buildings that do not fall into standard use classes, which can complicate the planning context for certain mixed-use developments.

In summary, planning permission is a fundamental regulatory requirement for most cladding projects. It ensures that the aesthetic and environmental integrity of the built environment is maintained, even as buildings undergo necessary technical upgrades to their external wall systems.