Lede

Renting in Britain is held together by paperwork, gut feel and a referencing industry nobody trusts. Holt is the trust layer underneath it — a marketplace where landlords and tenants are both verified, both scored, and meet each other on the strength of evidence rather than the size of a deposit.

Context

The Renters’ Rights Act 2025 received Royal Assent in October 2025 and begins commencement in May 2026. It is the largest reform to English tenancy law in thirty years. Section 21 “no-fault” eviction goes. All Assured Shorthold Tenancies convert to periodic tenancies. Rent increases must follow a new statutory route. The government’s Private Rented Sector Database — mandatory registration for every landlord — is being phased in but is not expected to be fully operational until 2027 or 2028. The Landlord Ombudsman, the other half of the regulatory fix, is not due before 2028.

The transition is not theoretical. The English Private Landlord Survey 2024 counts 2.3 million private landlords in England, letting to 4.6 million tenant households. The National Residential Landlords Association estimates 65,000 of those landlords exited the market in 2023–24, with up to 93,000 more leaving in 2025. The ones who are staying are the serious operators — portfolio landlords, professional letting agents, accidental landlords with a single high-value flat. They are reading the legislation. They are buying software. They are choosing who to trust.

Meanwhile the consumer stack has not moved. Rightmove is a listings board priced like a media buy. OpenRent runs a one-way referencing flow. Canopy verifies tenants but does not put them in front of landlords. There is no two-sided verified marketplace in the UK and the regulatory clock has already started ticking.

The problem

Voids and bad tenants. Every landlord at the National Landlord Investment Show in April 2026 names the same two costs. A void week on a £1,200/month London flat is £300 gone. A bad tenant is six months of arrears, a Section 8 application, a court date that gets adjourned twice, and a property handed back with a kitchen that needs ripping out. The professional landlord lives in the gap between those two outcomes.

The existing stack does not close the gap. Rightmove and Zoopla optimise for ad volume — a listing on Rightmove will collect forty applicants, of whom the landlord will manually filter, ring, chase references for, and disappoint. Standard referencing relies on payslips and a self-declared employer, both of which a determined applicant can fabricate in fifteen minutes with a PDF editor. Open Banking exists but nobody in the residential rental flow has wired it in properly. The thirty-percent-of-gross affordability rule used by most agents is a 1990s heuristic that ignores existing debt — a £60,000 salary with a £1,200 car lease and three buy-now-pay-later accounts is not the same tenant as a £45,000 salary with no obligations, and the old rule cannot tell them apart.

On the tenant side, the experience is worse. Verification is repeated for every application — fresh credit check, fresh employer reference, fresh agent fee where the law still allows it. A renter with five years of clean payment history has no way to carry that record forward. Good tenants compete on luck and front-loaded cash. Bad tenants slip through on volume.

For both sides the cost is the same: nobody can prove anything portable.

What we built

A two-sided verified marketplace. The defining property is that both sides are scored, both sides are vetted, and both sides see only the other side of the platform that has already cleared the same bar.

Tenants build a portable Trust Score between 0 and 100. The score is a weighted composite of four components — credit history from Experian Connect (soft search, no impact on the underlying file), disposable income from TrueLayer Open Banking, verified references requested directly from previous landlords, and on-platform payment history. Every input arrives from a source that is not the applicant. Onfido biometric identity verification and Right to Rent are gating checks rather than score inputs — pass and you can have a Trust Score, fail and you are off the platform.

Landlords earn a Landlord Score with the same architecture. Post-tenancy reviews — only from tenancies Holt can prove happened — feed the Reviews component. Platform telemetry measures Response Time on messages and maintenance tickets. Certificate uploads (Gas Safety, EICR, EPC, deposit protection, prescribed information) populate the Compliance component, with expiry dates tracked automatically.

The matching layer sits on top of both scores. A landlord with a property listed in Hackney sets a minimum Trust Score, a budget range, a pet policy. The marketplace surfaces only pre-approved applicants who clear an affordability gate based on disposable-income-to-rent ratio (default 2.5x, landlord-tunable). A tenant with a verified Trust Score above 70 sees only landlords whose Landlord Score and compliance status clear their own threshold. Priority weighting boosts the top quartile on both sides, so the best tenants meet the best landlords first — and the quality tier reinforces itself with every completed tenancy.

The product also ships Making Tax Digital for Income Tax. From April 2026, landlords with qualifying income above £50,000 are mandated onto MTD; the threshold drops to £30,000 in 2027 and £20,000 in 2028, roughly doubling the affected population at each step. Holt builds the submission layer natively against the HMRC APIs; the year-end tax-crystallisation engine is in scope for v2. The landlord’s bank feed, tenancies, properties, certificates and quarterly submissions all sit in one product.

It is the trust marketplace landlords need now, and the compliance spine they will need by 2028.

Architecture

The data model is the moat, so the architecture serves the data flywheel above all else. Postgres on Neon holds the core tenancy graph — users, properties, tenancies, payments, certificates, reviews, scores — with row-level security on every table and UK data residency in eu-west-2. Scores recompute server-side every time a relevant event fires (verification added, tenancy completed, review submitted, payment logged), so there is never a stale composite.

The application layer is split. A NestJS API surfaces the business logic — scoring, matching, compliance, document generation — and a Next.js web client plus a React Native mobile client consume the same endpoints. The NestJS choice over a plain Express setup is deliberate: decorators, dependency injection and a module system that scales past the first feature, because the surface area here will not stay small.

External integrations are wired in as discrete services. TrueLayer for Open Banking — already in production inside Holt for rent collection telemetry, extended for affordability scoring and (in build) MTD bank feeds. Experian Connect-class soft credit search is the integration target for the credit component; no commercial agreement is signed at this stage. Onfido for biometric identity and Right to Rent. Stripe for landlord subscription billing and on-platform rent collection. Resend for transactional email. HMRC’s MTD APIs — Business Details, Obligations, Property Business v6.0, Self Assessment, Individual Calculations — are integrated through an OAuth flow that lives in the landlord panel, with Fraud Prevention Headers captured per submission as required for recognition.

A small AI layer earns its keep where it materially helps: an LLM classifies Open Banking transactions to produce a real disposable-income figure rather than a gross-salary heuristic; a vision model parses uploaded Gas Safety and EICR certificates to populate the compliance centre; a separate classifier triages post-tenancy reviews for retaliatory language before publishing; assistive drafting in the in-app chat helps landlords write Section 13 notices that comply with the Act. None of this is positioned as the product — the product is trust, and the AI is plumbing.

How it works (the short version)

• Trust Score (0–100) — Experian credit, TrueLayer Open Banking disposable income, verified references, on-platform payment history. Identity verification and Right to Rent are gating, not scoring.
• Landlord Score (0–100) — verified-tenancy reviews, measured response time, certificate compliance status.
• Smart Matching — affordability gate (disposable-income-to-rent ratio, default 2.5x), hard filters (location, bedrooms, pets), reciprocal score thresholds, top-quartile priority boost.
• MTD spine — TrueLayer bank feed, SA105-mapped categorisation, cumulative quarterly submissions. Year-end tax-engine handoff in scope for v2.
• Stack — NestJS API, Neon Postgres + pgvector, Clerk auth, Vercel Blob storage, Next.js web, React Native mobile, UK data residency in eu-west-2.

Live behaviour today

Holt is in MVP build. The sprint plan is eight two-week sprints to public beta, London first then Manchester. The trust scoring schema, the matching algorithm, the property and tenancy data model and the MTD design document are all signed off and the implementation architecture is locked. The first integrations (TrueLayer, Stripe, Resend) are live in the platform’s dependent product Holt Agent, which has been in production at holtagent.com since April 2026 and serves as the proof-of-stack for the core marketplace.

No commercial partnerships are signed at this stage — the integration architecture is built so credit, identity and tax-engine providers can plug in once the business case justifies the licence cost. Onfido is integrated in the agent product and ready to lift across. The landlord waitlist seeded from the National Landlord Investment Show in April 2026 is being warmed.

What’s next

• Public beta — London (Q3 2026). Tenant and landlord onboarding, Trust Score live, Landlord Score live, matching engine on, payment rails through Stripe, MTD submission spine in shadow mode against the HMRC sandbox.
• Manchester rollout (Q4 2026). Second city, supply seeded through portfolio landlord partners. MTD goes live against production HMRC APIs for the first cohort of mandated landlords (those over £50k).
• HMRC recognition (H1 2027). Holt joins the official “Software that works with MTD for Income Tax” list. Year-end tax-crystallisation handoff goes live alongside it. Threshold drops to £30k, addressable market roughly doubles.

Tech stack

• Frontend — Next.js (web), React Native + Expo (mobile), Tailwind, Radix primitives
• Backend — NestJS, TypeScript, REST + selected GraphQL endpoints
• Data — Neon Postgres with row-level security, pgvector for embeddings, Clerk for auth, Vercel Blob for file storage
• AI — Anthropic Claude (transaction classification, review triage, document drafting), Claude vision (certificate parsing)
• Integrations — TrueLayer (Open Banking · live), Onfido (identity · live in Holt Agent, lifting across), Stripe (subscriptions + rent), HMRC MTD APIs, Resend (email). Credit-search and year-end tax engine wired as drop-in providers; no commercial agreements signed.
• Infra — Vercel for the web client, AWS eu-west-2 for the API tier, UK data residency end-to-end

Status

Sprint plan in flight, eight two-week sprints to public beta, London first then Manchester. Holt is the cover-star project of the lab — the largest piece of civic infrastructure we have ever built.

Raising

Holt Ltd is raising a pre-seed round to land ahead of the Section 21 abolition window in May 2026. The market is real and the wedge is timed: £75B of annual UK rent flows through 2.7M private landlords, 158,000 of them exited the market across 2023–25, and the public rails (PRS Database, Landlord Ombudsman) ship slowly enough that a consumer trust layer can sit above them. The competitive map is empty in the verified two-sided quadrant — Alphaletz / Hammock / Landlord Vision are single-player tools, OpenRent / Rightmove are unscored marketplaces, Canopy has tenants but no landlord side. That’s the quadrant Holt sits in.

The full investor brief — round size, valuation, unit economics, the 24-month roadmap, and the use-of-funds breakdown — lives at holt.bentolabs.co.uk. LOIs accepted now; the round converts to ASA on Holt Ltd incorporation in Q3 2026 (UK Founder Visa endorsement) and to SEIS/EIS shares within six months. Holt Ltd raises separately as a sister entity to founder-held Bento Labs Ltd — investor equity in this round is in Holt only.

Why this matters for Bento Labs

Holt is the housing compartment of the bento. Everything Bento Labs builds is a different compartment of the same life — work in Neatbooks, kitchen in BentoPOS, van in Reckon, commerce in Agora, nervous system in Overstimulated — and Holt is the roof over all of it. The thesis is that a small studio can ship civic-scale software when the leverage is right, and Holt is the test case. If we can stand up the trust layer that the UK rental market lost when Section 21 fell, the rest of the portfolio is built on the same conviction.