Landlords listing flats, plumbers bidding for maintenance jobs. Six hundred properties listed in the first quarter. He had built fast and shipped fast, and for a while that was enough. Then the first letting agent firm asked to see the compliance story before it would put its name on the platform.
Industry Proptech development · AML-aware · TDS-aware · Land Registry-aware · UK
Proptech development for the deal about. to close.
Proptech development for UK founders, estate agencies, and property B2B teams. We build transaction platforms, valuation models, and agent CRMs with AML on property transactions, Companies House + Land Registry integrations, GDPR for tenant and landlord data, and FCA-aware Buy-to-Let workflows.
24hreply, from a senior
200+projects shipped since 2019
Senioronly, on the spine
Why UK proptech founders sign
Your buyer, your regulator, and your letting agent ask the same questions. We build to the answers.
Custom proptech software development isn’t a feature you bolt on at the first compliance review. It’s a set of decisions you make in week one, or pay months to retrofit after a letting agent firm walks. We make them in week one.
“The audit log was the document that brought the letting agent firm back. They read it once and signed.”
001
2
UK proptech platforms shipped to production since 2019.
002
0
Sanctions breaches, double-bookings, or tenant-data leaks in production.
003
0
TDS deposit disputes lost in production to date.
The founder this page is for600 listings · first firm walked · 12-week rebuild
Tom founded a UK proptech marketplace. The product worked. The compliance didn’t hold.
There wasn’t one. No AML triage on landlord identity. No tenant deposit handling under the Tenancy Deposit Schemes. No audit log per booking. No separation of tenant and landlord data. The first letting agent firm walked away. The board call that followed was not a pleasant one.
We rebuilt the spine over twelve weeks. AML triage on landlord onboarding. TDS-aware deposit handling. Audit log per booking and maintenance action. Companies House integration for company landlords. Tenant data segregated with role-scoped access. The letting agent firm re-engaged. Four more signed in the following quarter. This page is for the proptech founder who’d rather build with the regulator and the auditor in mind on day one.
Six pillars a generic SaaS shop
can’t hand a property team.
A generic build ships no AML, no audit, no Land Registry. A proptech build ships all three on day one. The cost of designing for them in week one is a fortnight of architecture; the cost of retrofitting after a letting agent firm walks is months. Open any row.
MLR 2017 applies to letting and estate agents. CDD on landlords and commercial tenants, sanctions screening, SAR-ready exports, designed in at architecture.
Title check at listing time. Beneficial ownership for company landlords. A mismatch triggers manual review before the listing goes live.
Role-scoped access at the data layer. One letting agent can’t see another agent’s tenants. Audit log per data touch. Cross-agency leaks are architecturally impossible.
Right to Rent baked into tenant onboarding. Document upload, verification, a reminder if missed, and an audit log shipped to the landlord on demand.
Day 1 of the audit maps your FCA permissions. BTL mortgage broker referral with an audit log. Permissions documented. Your compliance lead reads the brief and signs.
You keep everything. IP assigns on every commit. No juniors, no lock-in, and a real reply from Mohit inside 24 hours.
The proptech pain. The day-1 answer.
Every property founder who emails us is fighting one of these eight things. Each one is impossible to fix cheaply once the codebase is live. Each one is a single architectural decision made on day one of our build.
- 01
“MLR 2017 applies to letting agents. We have no CDD process on landlords.”
AML triage at landlord onboarding. A LangGraph agent runs CDD on landlord onboarding. Companies House for company landlords. Sanctions screening. PEP check. SAR-ready exports. CDD lifecycle tracked.
- 02
“A tenant disputes a deposit deduction and we can’t prove the inspection findings.”
Inventory audit + photographic evidence chain. Time-stamped inventory with photographic evidence. Inspection report locked. Chain-of-custody audit. TDS / DPS / mydeposits dispute defence built into the data model.
- 03
“A landlord forgot to do a Right to Rent check and we weren’t tracking it. Penalty risk.”
Right to Rent workflow + reminder + audit. Right to Rent baked into tenant onboarding. Document upload, verification, reminder if missed. Audit log shipped to the landlord on demand.
- 04
“A landlord listed a property they don’t own and we didn’t catch it.”
Land Registry title verification at listing. Title check at listing time via the Land Registry API. Beneficial ownership for company landlords through Companies House. A mismatch triggers manual review.
- 05
“One letting agent saw another agent’s tenant data. Role-scope wasn’t enforced.”
Role-scoped access at the data layer. A letting agent only sees their own listings and tenants. Audit log per data touch. A cross-agency leak is architecturally impossible, not policed by code review.
- 06
“A maintenance job double-booked because of a webhook race. Plumber and tenant both frustrated.”
Idempotent booking handler + audit log. Every booking carries an idempotency key. Race conditions are architecturally impossible. The audit log shows every state transition with actor and timestamp.
- 07
“We touch buy-to-let mortgages. Are we in FCA scope?”
FCA permissions mapping in audit week. Day 1 of the audit maps your FCA permissions. BTL mortgage broker referral with an audit log. Permissions documented. Your compliance lead reads the brief and signs.
- 08
“Agents argue over who got the lead and we have no clear lead-source audit.”
Lead-source attribution + audit chain. Every lead logs source, attribution agent, and conversion. The commission split is visible to both parties. Disputes get resolved on data, not on shouting matches.
First firm walked, four firms signed
Tom’s marketplace, in real numbers. The spine rebuilt over twelve weeks, behind a flag, with zero downtime at cutover.
12wk
Spine rebuilt behind a
The audit log was the document that brought the letting agent firm back. They read it once and signed.
Three tiers, one auditable property spine.
The picks UK proptech builds have stress-tested. Tier 1 runs every proptech build. Tier 2 is what we reach for when the brief carries lettings, payments, or credit weight. Tier 3 scales it without a rebuild.
T1
What we build every proptech build on
MERN + FlutterMongoDBExpress.jsReact + Next.jsNode.jsTypeScriptFlutterPostgreSQLMixpanelGoCardlessLand Registry APICompanies House APILangGraph
T2
When your proptech brief calls for it
reach when neededPythonStripeOnfido / SumsubExperian / EquifaxRightmove APIZoopla APIEPC data
T3
The infrastructure that scales it
AWS + cloud-nativeAWSKubernetes (EKS)DockerAWS LambdaAWS RDS / AuroraS3 + CloudFrontRedisApache KafkaTerraformDatadog + SentryVanta / Drata
Case study · UK proptech · 2024
First firm walked to
First firm walked to
four firms signed, in one quarter
Tom’s marketplace, in real numbers. We rebuilt the spine over twelve weeks: AML triage on landlord onboarding, TDS-aware deposit handling, Right to Rent workflow, Land Registry title verification, and role-scoped agent, tenant, and landlord data segregation. Behind-flag rollout, zero downtime.
The rebuild
12wk
Spine rebuilt behind a flag
0
Downtime at cutover
The outcome
1
First letting agent firm re-engaged
4
More firms signed that quarter
Track record
100%
Land Registry title checks at listing
0
TDS disputes lost in production
PROPTECH SURFACES WE’VE SHIPPED
Proptech surfaces, live in production
What lives on the property spine. Each one audit-logged, role-scoped, and built so the regulator and the acquirer both read the brief and stop asking.
SURFACE(01)
Listing portals
Property listings, search, virtual tours, agent and landlord roles. SEO-optimised and edge-rendered. Title verified at listing through the Land Registry.
SearchVirtual toursLand RegistryEdge-rendered
Listing portals
SURFACE(02)
Transaction platforms
Offer, counter-offer, exchange, completion. Audit log per state transition. AML at each gate. Idempotent handlers so nothing fires twice.
OffersAudit logAML gatesIdempotent
Transaction platforms
SURFACE(03)
Agent CRMs
Lead pipeline, viewing scheduling, vendor and buyer comms, commission tracking, MTD-ready exports. Lead source logged for clean attribution.
Lead pipelineSchedulingCommissionMTD exports
Agent CRMs
SURFACE(04)
Lettings management
Tenancy lifecycle, deposit handling, rent collection via GoCardless, repair tickets, audit log. TDS and DPS dispute defence in the data model.
Tenancy lifecycleGoCardlessTDS / DPSRepair tickets
Lettings management
SURFACE(05)
Property AI agents
Inbox triage for letting inquiries. Document chase via WhatsApp and SMS. Compliance reminders before a Right to Rent check lapses.
Inbox triageWhatsAppSMS chaseRTR reminders
Property AI agents
SURFACE(06)
BTR + co-living platforms
Build-to-rent and co-living management. Shared spaces, community comms, rent and bills split, all on a single ledger. Shared ownership equity and staircasing audit-logged.
BTRCo-livingBill splitStaircasing
BTR + co-living platforms
What proptech founders actually ask before signing
Pain-first, soft-second. The questions every property founder asks after their first compliance review went badly.
Yes. Document upload, verification, a reminder for renewal, and an audit log shipped to the landlord on demand. Right to Rent is baked into the tenant onboarding flow, not bolted on. Penalties for a missed check are real money, so we make the workflow impossible to skip rather than something a busy agent can forget.
TDS / DPS / mydeposits integration, time-stamped inventory with photographic evidence, and an inspection report locked once finalised. There’s a chain-of-custody audit on every change. Deposit deduction dispute defence is built into the data model, so when a tenant challenges a deduction you reach for the evidence, not for your memory of the inspection.
MLR 2017 applies to letting agents, and a lot of proptech teams discover this the hard way. Our custom proptech software development runs AML triage at landlord onboarding through a LangGraph agent. Companies House for company landlords, sanctions screening, PEP check, SAR-ready exports, CDD lifecycle tracked. Your compliance lead reads the brief and signs.
Yes. Both APIs are wired: listing sync, lead capture, and performance reporting per portal. Our median onboarding to active listing on a new portal is three days. As a proptech development company in London, we’ve done these integrations enough times that the portal feeds aren’t the part we worry about.
It depends on what you do. If you give advice, yes. If you refer to an FCA-regulated broker with a clean audit trail, often no. Audit week maps your model and documents the FCA permissions stance in writing, so you’re not guessing at the boundary and neither is your regulator.
Three things make this hard to fake. The 30-day walk-away clause goes both ways and refunds the unused portion. Payments are milestoned 25/25/25/25, so you never pay more than 25% ahead of working software. And we’ve been shipping since 2019, UK VAT registered and listed on Companies House. You can check us before you sign a thing.
Yes, with 14 days’ notice. The engineers move to other projects, your repo stays where it is, your spend pauses. Pick it back up with 14 days’ notice and we resume at the same sprint board with the same engineers. No cancellation fee, no restart fee. We’ve done this six times in 2025.
Yes, signed inside 30 minutes via DocuSign. We keep a mutual NDA template ready so the paperwork never holds up the conversation. Send the brief once it’s back and Mohit reads it personally.
In context
The surface you hand over.
proptech development, in context — the dashboards, flows and components your team actually ships, reviews and maintains.
One paragraph. That’s it.
Tell us what you’re building, who your buyers are, and the regulatory or compliance question you’re most worried about. Mohit reads every first email and replies inside 24 hours: a clear yes, a clear no, or the one question that decides it.
What happens after the email lands
- < 24h
A personal reply.
Yes, no, or the deciding question. Straight to your inbox, not a team thread.
- Week 1
Audit week begins.
We map your build against AML, TDS, and Right to Rent duties, write the trade-offs, hand you a signed scope.
- Week 14
Audit-ready proptech.
Listings, deposits, AML triage, Land Registry, and the brief your acquirer’s CTO reads cold.