Landmark and Verisk are two of the largest suppliers of property risk and building data in the UK, but they come from different industries and serve different primary customers. Landmark's roots are in conveyancing and environmental due diligence for the legal profession. Verisk's UK operation is built around insurance underwriting, peril modelling, and claims estimation. Understanding where each platform excels - and where neither delivers - matters for procurement teams evaluating risk data suppliers.
This comparison covers the core product suites, data approaches, pricing models, and practical trade-offs between the two.
Who is Landmark?
Landmark Information Group was incorporated in 1994 and is wholly owned by DMGT (Daily Mail and General Trust), the private media group that was taken private in 2021. DMGT's Property Information division, which includes Landmark alongside Trepp and Yopa, generated £219 million in revenue in FY2024.
Landmark's core business is environmental and property risk reporting for conveyancing. Its product suite covers contaminated land screening, flood risk (including an exclusive arrangement as the sole commercial partner of the Environment Agency for surface water flood data with depth measurements), ground stability, radon, coal mining risk, climate change projections, chancel repair liability, and planning impact assessments.
The group operates through more than a dozen subsidiary brands - SearchFlow, OneSearch Direct, Millar & Bryce, Ochresoft, Optimus, Metropix, and Argyll Environmental among them. It draws on over 700 datasets from nearly 400 data suppliers and claims involvement in over 97% of property transactions in England and Wales. Its SPN+ network processes 1.5 million mortgage valuation instructions per year.
Who is Verisk?
Verisk Analytics is a Nasdaq-listed, S&P 500 company with a market capitalisation of approximately $37 billion and $2.88 billion in FY2024 revenue. Its UK property data operation was built primarily through the 2016 acquisition of The GeoInformation Group, a Cambridge-based geospatial company whose aerial imagery classification became the foundation for the UKBuildings database.
UKBuildings covers 29 million GB addresses with detailed building characteristics - age, roof type, wall materials, floor area, number of storeys, basement presence, flat conversion indicators, and listed building status - derived from high-resolution aerial imagery and proprietary data sources. The dataset achieves 98% coverage across Great Britain plus the Belfast urban area.
Verisk's wider UK portfolio includes eight address-level peril models (flood, subsidence, storm, theft, fire, escape of water, freeze, accidental damage), the Data Insight Hub for real-time API enrichment, Location Matters for interactive risk mapping, rebuild cost estimation for residential (ResInsight) and commercial properties, AddressIT for address verification, and Xactimate for claims estimation. The company is an official Ordnance Survey partner and jointly created deeper building data for Great Britain in 2024.
Feature comparison
Environmental risk data
Both platforms provide environmental risk intelligence, but the depth, format, and intended use differ considerably.
Landmark delivers risk data through structured reports designed for the legal conveyancing process. Its Envirosearch Residential report covers contaminated land, flood, ground stability, radon, coal mining, and climate change - formatted so solicitors and conveyancers can rely on it professionally, backed by £10 million professional indemnity cover per report. The in-house Argyll Environmental consultancy provides manual review and expert opinions on flagged risks. Landmark's exclusive Environment Agency partnership gives it surface water flood data with depth measurements that no other commercial provider can access.
Verisk's peril models are designed for insurance pricing and underwriting rather than legal due diligence. Its eight models cover a broader range of perils - adding storm, theft, fire, escape of water, freeze, and accidental damage to the flood and subsidence that Landmark also covers - and are regularly recalibrated with claims data. However, they are not formatted as conveyancing-grade reports and do not carry the professional indemnity assurance that the legal profession requires.
Building characteristics and physical data
Verisk has the stronger offering here. UKBuildings provides granular physical property data - building age, construction materials, roof type, floor area, number of storeys, basement presence - classified from aerial imagery at a level of detail that Landmark's environmental reports do not replicate. This data is purpose-built for insurance pre-fill and underwriting automation.
Landmark's geodata products (Promap mapping, PointX points of interest) provide spatial and location intelligence, but the group does not maintain a comparable national building characteristics database. Landmark's strength lies in what surrounds and affects the property (environmental hazards, planning context, local searches) rather than the physical attributes of the building itself.
Rebuild cost estimation
Verisk offers rebuild cost estimates through ResInsight (residential) and the Commercial Rebuild product launched in October 2025. These use a quantity surveyor pricing model with regular updates aligned to changing material and labour costs. The commercial product specifically targets the estimated 46% of UK commercial properties that are underinsured.
Landmark does not provide rebuild cost estimates. Its products assess environmental risk and hazard exposure rather than reinstatement value.
Data delivery model
This is where the operational differences become sharpest. Landmark primarily delivers through per-transaction reports ordered via its portal, 100-plus search provider partners, or the SearchFlow platform. Individual reports range from £23 (chancel screening) to £350-plus (biodiversity net gain assessment), plus VAT. The model is designed for the legal transaction workflow - one report per property per conveyance.
Verisk delivers through multiple channels: real-time API via the Data Insight Hub, flat file licensing, batch processing, GIS integration, and the Location Matters portal. This flexibility suits the insurance industry's need for high-volume, automated data enrichment at the point of quote.
For organisations that need to query property data at scale through an API rather than ordering individual reports, Verisk's delivery infrastructure is significantly more accessible.
Geographic coverage
Landmark covers England, Wales, and Scotland, with dedicated Scottish products through Millar & Bryce and Landmark Scotland. Northern Ireland coverage appears limited across the group.
Verisk's UKBuildings covers Great Britain plus the Belfast urban area in Northern Ireland, but does not provide full Northern Ireland coverage either. For organisations requiring complete UK-wide data, neither platform fully delivers.
Where Landmark is stronger
Landmark is the clear choice for use cases tied to the property conveyancing process. Its environmental reports meet Law Society and SRA requirements, carry £10 million PI cover, and are accepted by solicitors, conveyancers, and lenders as part of the standard transaction workflow. The exclusive Environment Agency partnership for surface water flood data with depths is a data source that Verisk cannot access commercially.
The breadth of the Landmark group - conveyancing searches, panel management, workflow software, estate agency compliance tools, and CPD training through Landmark Academy - creates an ecosystem covering the property transaction from instruction to completion. For legal professionals, this ecosystem is hard to replicate.
Project 28, Landmark's industry charter for faster property transactions with 23 signatories including HSBC, Lloyds, Nationwide, and Legal and General, positions the company as a convener of industry-wide change - a strategic asset that goes beyond product features.
Where Verisk is stronger
Verisk is the stronger platform for insurance underwriting, pricing, and claims management. Its building characteristics data, eight-peril modelling suite, rebuild cost estimation, and claims tools (Xactimate, the new property claims carbon calculator) are designed for the full insurance value chain. Named clients including Hastings Direct, Hiscox, Beazley, and Aviva demonstrate deep enterprise adoption.
The Data Insight Hub's API delivery model is better suited to high-volume automated use cases than Landmark's per-report transaction model. For organisations that need to enrich thousands or millions of property records programmatically - for quoting, portfolio analysis, or risk modelling - Verisk's infrastructure is more appropriate.
The Ordnance Survey partnership and joint building data programme also give Verisk a data provenance advantage for physical property characteristics that Landmark's environmental focus does not address.
Where Chimnie fits in
Landmark serves solicitors. Verisk serves insurers. Both deliver strong data for their respective markets, but neither offers a single product that spans property valuations, building characteristics, environmental risk, planning data, and commercial property attributes in one API call.
Chimnie occupies that middle ground. Its API returns over 500 attributes per UK property at £0.05-0.15 per residential lookup, covering the environmental risk data relevant to Landmark's market, the building intelligence relevant to Verisk's market, and additional layers that neither provides. These include automated valuations with confidence intervals through a free AVM, planning permission intelligence (completing two years of national ingestion, launching imminently), outbuildings mapped and classified separately from the main dwelling, and commercial property data at £0.45 per property on a pay-as-you-go basis with ratecard volume discounts.
Where Landmark charges £42.50 plus VAT for a single flood report and Verisk bundles building data behind enterprise contracts, Chimnie's per-property pricing and self-serve onboarding make it accessible to proptech teams, SME brokers, and developers who need property intelligence without procurement overhead. Over 150,000 consumer users validate the underlying data on Chimnie's research platform, providing a continuous feedback loop that traditional B2B providers lack.
A free trial is available for teams that want to assess data quality and coverage before committing to either enterprise supplier.
Conclusion
Landmark and Verisk serve different industries with different delivery models, and most organisations will already have a clear view of which they need based on whether they sit in the legal or insurance value chain. The overlap between them is limited to flood and subsidence risk, where each approaches the data from a different angle and for a different audience.
For procurement teams reviewing their property data supply chain, the more productive question is whether per-report and enterprise contract models remain the most efficient way to access property data - or whether API-first alternatives with transparent pricing deserve a place alongside established suppliers.
