Statutory Diligence GuideUpdated October 2026Follow on Google★

Free Online Overage Clause Clawback Calculator UK: Planning Gain Estimator

Statutory Source: Law of Property Act 1925 & RICS Red Book Valuation Standards

Quick Answer: Free Online Overage Clause Clawback Calculator UK: Planning Gain Estimator

Our free online Overage Clause Clawback Calculator allows UK landowners, property developers, and conveyancers to model clawback liabilities under standard Law of Property Act deeds. Enter your baseline threshold land value, input your estimated enhanced value with planning permission, deduct 5 categories of allowable expenditure (CIL, Section 106, planning consultancy, survey fees, and site abnormals), and adjust your contractual clawback percentage (typically 20% to 50%). The calculator computes exact vendor clawback versus developer retained profit, models buyout settlements, and generates an official certified 1-page A4 brief.

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How to Use the Interactive Overage Calculator

Our interactive calculator models statutory algorithms under the Law of Property Act 1925 and RICS Valuation Standards:

Step 1: Enter your property's baseline unencumbered threshold value (e.g. £250,000).

Step 2: Enter your projected open-market value with planning permission (e.g. £1,200,000).

Step 3: Itemise allowable planning, survey, Section 106, and CIL deductions.

Step 4: Set your contractual clawback percentage slider (default 30%).

Step 5: Review your computed net clawback payable, developer retained equity, and download your official certified 1-page A4 planning diligence certificate.

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Instant 3-Second Statutory Screening

Check Any Property Across 12 Official Statutory Registers

Conducting property due diligence requires cross-referencing multiple public registries. Run a free instant desktop screening across Environment Agency flood models, British Geological Survey subsidence data, UKHSA radon maps, HM Land Registry sold prices, and local planning constraints.

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Environment Agency FloodingSurface water, rivers & sea risk bands

BGS Ground StabilityShrink-swell clay & subsidence risk

UKHSA Radon Gas PotentialOfficial radon class & protection rules

HM Land Registry PricesHistorical transactions & tenure type

EPC Energy & RdSAP SpecsOfficial construction era & wall fabric

Planning Applications BufferRecent nearby planning notices (500m)

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Official Primary Verification Registers

Cross-reference property diligence across verified UK government open registers under the Open Government Licence v3.0:

Category: Overage Clauses & Clawback Agreements

Property Age & RdSAP Era

Official construction age bands, wall specifications, and earliest conveyance dates.

MHCLG Energy ActOpen Tool

Council Tax & Precepts

Statutory Band A–H ratios, police/fire levies, and 1 April 1991 baseline thresholds.

Local Govt Finance Act 1992Open Tool

Public Rights of Way (PRoW)

Conclusive legal proof of footpaths, bridleways, and restricted byways on land.

Wildlife & Countryside Act 1981Open Tool

Planning & Consultations

Live planning applications, 21-day neighbor notices, and permitted development appeals.

Town & Country Planning Act 1990Open Tool

Flood Risk & Surface Water

Statutory Flood Zones 1, 2, 3, 30/100/1000-year pluvial models, and Flood Re rules.

Flood & Water Mgt Act 2010Open Tool

Land Registry Sold Prices

Verified historical completion prices, title deed values, and regional ONS house price indices.

Land Registration Act 2002Open Tool

Stamp Duty (SDLT)

Exact progressive residential thresholds, £300k FTB relief, and 5% additional home surcharges.

Finance Act Statutory ScheduleOpen Tool

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Topical Knowledge Cluster

Inspect Any UK Property on Our Overage Clause Clawback Calculator

Run an instant preliminary screening across official government databases including the MHCLG EPC register, HM Land Registry, and Environment Agency records.

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Official Statutory Notice & Guidance:

This guide is compiled for informational due diligence referencing official statutory records from Law of Property Act 1925 & RICS Red Book Valuation Standards under the Open Government Licence v3.0. Legal titles and physical structural condition should always be independently inspected by a qualified conveyancing solicitor and chartered RICS surveyor prior to legally binding property commitments.