How to Research a Property's Planning History in London and Why It Matters

**The London Borough's online planning portal**:

Every London Borough has an online planning portal that provides public access to the planning register for all applications decided since the portal was introduced (typically mid to late 2000s; some Boroughs have digitised older records). To search:

1. Go to the London Borough's website and find the planning section 2. Use the 'Search planning applications' or 'Planning register' tool 3. Search by address — enter the full address or partial address + postcode 4. Review all applications registered against the address

• *What the planning portal shows*:
• •All planning applications submitted against the address (including applications that were withdrawn, refused, or approved)
• •The case officer, key dates, and decision
• •Planning documents: application form; supporting drawings; supporting statements; consultation responses; officer's report; decision notice
• •Planning conditions attached to any approval (found in the Decision Notice)
• •Any appeal against a refusal (appeal reference; appeal decision)

• *What the portal may NOT show*:
• •Pre-2000 planning history (often not digitised — older applications may be held in physical files at the Borough's planning department)
• •Planning obligations (Section 106 agreements) — these are usually listed in the Decision Notice but the full S106 agreement may need to be requested separately
• •Building Regulations applications and decisions — these are separate from planning and held by the Borough's Building Control team (or an Approved Inspector, if used instead of the local authority)
• •Enforcement notices — these may be held in a separate enforcement register; not all Boroughs publish enforcement registers online

**National Planning Portal — Planning Data Service**:

The Ministry of Housing, Communities and Local Government (MHCLG) runs a national Planning Data Service at www.planning.data.gov.uk. This aggregates planning application data from many English LPAs but is not fully comprehensive — some London Boroughs' data may not be fully up to date on the national platform. Use the Borough portal as the primary source; use the national platform as a cross-reference.

**Local Land Charges Register**:

• A Local Land Charges (LLC) search (also called a Con 29 search) is a formal search carried out at property purchase by the buyer's solicitor. It discloses:
• •Planning decisions and conditions affecting the property
• •Section 106 agreements and unilateral undertakings
• •Community Infrastructure Levy (CIL) liabilities
• •Listed building status
• •Conservation area designation
• •Tree Preservation Orders
• •Enforcement notices (including those registered but not yet complied with)
• •Notices of the LPA's intention to take enforcement action

For a homeowner (not a purchaser) who wants to check the LLC register, a LLC search can be submitted directly to the Borough (fee approximately £30–£150 depending on the Borough). This is the most comprehensive source for formal planning and land charge matters.

**Historic England records**:

• •Listed building records: historicengland.org.uk/listing/the-list — search the National Heritage List for England for listed building designations affecting a property
• •Conservation area information: historicengland.org.uk/advice/planning — with links to Borough conservation area appraisals
• •Article 4 Direction register (not fully comprehensive but useful for cross-reference)

**London Building Control records**:

• Building Regulations completions are not disclosed on the planning portal — they are held by the Building Control authority that approved the work (the London Borough's Building Control team or an Approved Inspector). To check Building Regulations completion status for specific works:
• •Contact the London Borough's Building Control team directly with the address and approximate date of the works
• •Where an Approved Inspector carried out the Building Control function, the completion certificate is held by that inspector — the homeowner should have received a copy

For property purchase purposes, the absence of a Building Regulations completion certificate for known works is flagged by the local authority search and confirmed by the solicitor.

**Interpreting planning application decisions in the planning history**:

*1. Previous planning permissions (approved applications)*:

• A previously approved planning permission tells you:
• •What the LPA has previously agreed to on the site — useful as a precedent argument in a new application ('the LPA previously approved a rear extension of similar scale on this property under reference [XX/YYYY/FULL]')
• •What conditions are attached to the permission — some conditions may still be live (e.g., a condition specifying external materials that must be used for any future alterations; a condition requiring a tree protection plan before any garden works)
• •Whether the approved scheme has actually been built — an approved permission that has lapsed (permission is typically valid for 3 years) without being implemented is less useful as a precedent than a permission that has been built
• •What drawings were approved — if the extension was built to approved drawings, those drawings are the baseline for understanding what the LPA considered acceptable on the site

*2. Previous planning refusals*:

• A previously refused application tells you:
• •What the LPA has previously objected to on the site — the reasons for refusal are stated in the Decision Notice and are important context for any new application
• •Whether the refusal was appealed — a successful appeal overturning the refusal means the LPA's reason for refusal was found to be invalid by the Planning Inspectorate, which is a strong precedent in favour of the original scheme
• •Whether a revised scheme was subsequently submitted and approved — a pattern of refusal followed by approval of a revised scheme tells you the design modifications the LPA required to approve the development

*3. Withdrawn applications*:

An application that was withdrawn before a decision was made may have been withdrawn because the applicant received informal feedback from the planning officer that the scheme was unlikely to be approved in its current form. Withdrawn applications carry less weight as precedent than decided applications.

*4. Planning conditions on existing permissions*:

• Planning conditions attached to any approved planning permission on the property can have ongoing effects:
• •Pre-commencement conditions (conditions that must be discharged before works begin): if these relate to works that have already been carried out, you need to check whether they were discharged before works commenced — an undischarged pre-commencement condition means the works may be in breach of planning control
• •Pre-occupation conditions (conditions that must be discharged before the building is occupied): common on HMO applications (e.g., fire safety installation conditions); larger extension schemes (e.g., landscaping conditions); change of use applications
• •Permanent or ongoing conditions: some planning conditions run permanently with the property — for example, a condition removing the PD rights to extend further; a condition specifying the permitted use of a particular room

**How to use planning history in your planning application**:

*Using previous approvals as precedent*:

• In a planning statement or covering note for a new application, reference previous approvals on the property that are relevant to the new proposal:
• •'This application follows the approval of a rear ground floor extension under planning reference [XX/YYYY/FULL] in [year]. The proposed first floor extension above the previously approved ground floor extension is consistent in scale and design with the approved scheme.'
• •'A similar dormer extension was approved on the neighbouring property at [address] under reference [XX/YYYY/FULL] in [year], demonstrating the LPA's acceptance of this scale of development in this Conservation Area.'

*Addressing previous refusals in a new application*:

• If there is a previous refusal on the property for a similar scheme, the new planning statement must address the reasons for refusal and explain how the new scheme resolves each concern:
• •'This application addresses the reason for refusal of the previous application [XX/YYYY/FULL]: the proposed rear extension has been reduced in depth from 5.5m to 4.5m to reduce the impact on the amenity of the neighbouring property at [address], consistent with the officer's concern in the report of [date].'

**Checking for enforcement history — the enforcement register**:

Unauthorised development that the LPA has identified and served an enforcement notice on is registered against the property address. Before submitting a new planning application or completing a property purchase:

• *Signs of potential enforcement issues in the planning history*:
• •A gap in the planning history — works appear to have been carried out (visible in the property's current layout from photos or OS mapping) but no planning permission appears to have been obtained
• •An application for a Lawful Development Certificate (LDC) for an existing use — this is an application to confirm the development is lawful on the basis of time having passed (the 4-year enforcement immunity period for operational development; the 10-year period for change of use), which suggests the works were carried out without planning permission
• •A retrospective planning application — an application for planning permission for works that have already been carried out, rather than proposed works

If the planning history suggests potential enforcement concerns, a LLC search (see above) will reveal whether an enforcement notice has been registered. Contact the Borough's planning enforcement team directly if there is uncertainty about the status of any works.

**Planning history due diligence for property buyers in London**:

A local authority search (LLC and Con 29 search) is the standard due diligence for planning history at property purchase. The LLC search discloses planning permissions, conditions, listed building status, conservation area status, Tree Preservation Orders, CIL liabilities, and enforcement notices. The Con 29 search covers roads, proposals, drainage, and planning designations.

For London property purchases where the property has recently been extended, converted, or altered, the buyer's solicitor should: 1. Check the planning portal for the application history for the works 2. Confirm that any planning permissions have been obtained and any conditions discharged 3. Check that a Building Regulations completion certificate has been issued for any structural works 4. Check the LLC search for any enforcement notices or outstanding planning obligations

*The most common planning history issues at property purchase in London*:

*1. Extension built without planning permission*: Where the extension predates the 4-year enforcement immunity period (i.e., the extension was built more than 4 years ago and has been continuous since), the buyer's solicitor typically satisfies themselves via an LDC application or statutory declaration. Where the extension is more recent, the buyer should obtain a retrospective planning permission or SDLT indemnity insurance (for the conveyancing risk only, not for the planning risk).

*2. Loft conversion built without Building Regulations approval*: A loft conversion without Building Regulations approval (or without a completion certificate) is a frequent issue in London Victorian terraces. The absence of a completion certificate does not necessarily mean the works are unsafe, but it means that compliance with fire safety, structural, insulation, and staircase requirements cannot be confirmed without an independent inspection. Buyers typically require a retrospective Building Regulations regularisation application (submitted to the local authority Building Control) to resolve this.

*3. Change of use to HMO without planning permission*: In London Boroughs with HMO Article 4 Directions, a property converted from C3 to C4 (small HMO) without planning permission (where an Article 4 Direction required it) is in breach of planning control. The 10-year enforcement immunity period applies to changes of use — after 10 years of continuous C4 use, an LDC for the existing use can be applied for to confirm immunity from enforcement. Buyers should check the Article 4 Direction status for the specific address and the date of first use as an HMO.

*4. Unilateral undertaking or Section 106 agreement running with the land*: A Section 106 agreement or unilateral undertaking is disclosed in the LLC search. Where a S106 includes an affordable housing obligation or a restriction on use, this obligation transfers to the new owner. The buyer's solicitor must review any S106 disclosed in the LLC search before completion.

**Planning history and property value**:

A positive planning history — approved permissions for extensions, loft conversions, or change of use; a property in an area where comparable schemes have been approved — increases the market value of the development opportunity. A negative planning history — multiple refusals; enforcement history; outstanding conditions — reduces development value and complicates the planning process. Understanding the planning history before buying a property with development potential is essential due diligence.