AddressMaster:
Accurate Address
Data for Smarter Decisions

A Powerful Address Enhancement Solution for
More Accurate Valuations, Safer Lending & Better
Investments

The Property Data Upgrade You Didn’t Know You Needed

Poor address data can lead to costly errors such as misevaluations, delayed transactions, and increased risk exposure. TwentyCi AddressMaster is a specialised address enhancement service designed to improve the precision of your property data. By providing details down to the Unique Property Reference Number (UPRN), it ensures pinpoint accuracy beyond standard postal addresses. This reduces the risk of errors, misdirected communications, and complaints.

Why AdressMaster?

Reduce Lending Risks

Avoid funding properties with missing or incorrect data. Ensure every address is validated before making critical decisions.

Streamline Compliance

Meet KYC, AML, and FCA standards via address verification.

Achieve ESG Goals Faster

UPRNs improve ESG compliance tracking and risk assessment.

Enhance Portfolio Management

Accurate property location data enhances portfolio management.

Improve Property Valuations

Access UPRN-level insights that support more accurate valuations and lending assessments.

Seamless Integration

Plug into your CRM, marketing systems, or analytics tools effortlessly with our transactional API.

How AddressMaster works?

1️⃣ Search Any Address – Retrieve verified property data using flexible lookup options.

Lookups can be done via the following methods:

By UPRN
By querying a postcode and selecting a property in that postcode
Via our proprietary address-matching web service

2️⃣ Integrate with Ease – Use our API to instantly enhance your systems with better data.

In the context of a single property/UPRN, the following address data is accessible:

Formatted address
Lat/long
UPRN
AVM value
AVM confidence

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TwentyCi DOMUS is the UK’s Most complete property data resource built by using base data from Ordnance Survey’s AddressBase Premium product. It collects over 350 property attributes of every single UK residential property, including the EPC performance data.

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EcoVal360 Report

A specialised suite of Climate Change Reports tailored for the residential property market. These reports are designed to provide legal and property professionals with comprehensive insights into how climate change might impact a property’s future, aiding in due diligence and strategic decision-making.

WHAT OUR CLIENTS SAY

In rapidly changing market conditions, Twenty Ci's real-time data and analysis have provided unparalleled insight into the performance of various UK housing market sectors. This has kept us ahead of market trends, unlike other data sources which have fallen behind.

Lucian Cook

Head of UK Residential Research, Savills

Unfortunately, most commentary on the UK housing market is full of opinions and anecdotes. The antidote is to consume TwentyCi’s data to get to grips with what’s really going on. Everyone involved in housing transactions and ancillary services will gain insight into the market dynamics without the hot air!

Alex Bannister

Independent Economist

TwentyCi has been instrumental in improving our email strategy. Instead of generic promotions, we now send personalised messages focused on vehicle safety and maintenance. They’ve made it easy to bring together different data sources to create emails that are genuinely useful for our customers.

Matthew Froome

Head of Marketing, ATS Euromaster

Trusted By Many

At TwentyCi, we don’t just provide data—we deliver the most accurate, actionable, and comprehensive residential property insights to key UK authoritative opinion makers and media sources.

Featured Publications

Property and Homemover Report

The Benefits of Using Just One Data Provider

Featured Publications

Property and Homemover Report

The Benefits of Using Just One Data Provider

Quarterly Property and Homemover Report

Our Blogs and Guides

Case Studies

Press Resources

AddressMaster:
Accurate Address
Data for Smarter Decisions

A Powerful Address Enhancement Solution for
More Accurate Valuations, Safer Lending & Better
Investments

The Property Data Upgrade You Didn’t Know You Needed