Building a lettings tech stack that compounds: choosing your CRM and proptech

The average lettings agent now juggles six or more software tools before a tenancy is even signed. CRM, referencing, inventory, tenancy agreements, deposit protection, compliance checklists — each one a separate login, a separate dashboard, a separate support queue. If any one of them doesn’t talk to the others, you’re not running a tech stack. You’re running a spreadsheet with extra steps.

Yet the evidence suggests many agencies are still in that position. A 2024 InventoryBase survey of 436 property professionals found that poor integration is one of the leading barriers to proptech adoption — 23% said new tools simply fail to connect with their existing CRM, adding complexity rather than removing it. The same survey found that just 29% of agents use proptech daily, and 52% believe it delivers little or no return on investment. That’s not a technology problem. That’s a selection problem.

Choosing your stack well means thinking less about features and more about how tools compound — each one making the next more valuable rather than adding to the noise.

Start with the CRM: it’s the master record, not just the diary

The CRM is the core of your operation. Everything else should orbit it. That sounds obvious, but plenty of agencies choose their CRM based on price or familiarity and then discover — too late — that it locks them into a walled garden with no meaningful API access.

The UK market now has strong options at every tier. Reapit serves the larger multi-branch market and was the first UK property technology provider to open its platform to third-party developers, with its AppMarket allowing partners to integrate directly. Alto is one of the most widely used cloud CRMs among independent agencies. Street, Dezrez, Veco and Loop all carry strong user-satisfaction scores on independent review platforms — Kerfuffle, which lists more than 70 CRM suppliers, rates Veco, Loop, Dezrez, Reapit and Alto among the highest. Each has strengths; the question is what you’re building around them.

Key questions before you commit:

• Does it have a genuine open API — not just a feed or an export, but a two-way REST API that third-party tools can read from and write back to?
• Does it cover the full lettings lifecycle, from applicant registration through referencing triggers, tenancy creation, rent collection and renewal?
• Can it scale without a rewrite? Moving from 200 managed properties to 2,000 shouldn’t mean a new CRM; it should mean upgrading the plan.
• What does the integration ecosystem look like? A CRM with a deep partner network is worth more in practice than one with a slightly nicer UI and no way to connect anything to it.

Build around workflow, not features

A common mistake is evaluating CRMs and proptech tools feature-by-feature — ticking boxes on a spec sheet. A more useful frame is workflow-first: trace a single tenancy from initial enquiry to signed agreement and ask at each step, “Where does time leak?”

The leaks are usually predictable: chasing applicants for referencing documents, manually re-entering data between platforms, waiting for compliance confirmations before issuing keys. The best-built stacks close those gaps through automation and integration rather than adding a new app at each pain point.

For referencing in particular, the trigger and the result both need to sit inside the CRM. If an agent has to exit the CRM, log into a separate portal, order a reference, and then manually update the record when the result comes back — that’s friction that compounds across hundreds of tenancies a year. PropertyGoose’s open API is designed specifically to eliminate that loop: agents can trigger references from within their existing workflow and receive results back in the same place.

Compliance is the layer that can’t be bolted on

The Renters’ Rights Act 2025 received Royal Assent in October 2025, and its core tenancy reforms came into force on 1 May 2026 — converting assured shorthold tenancies to periodic assured tenancies and abolishing Section 21 ‘no-fault’ evictions. Rent increases are now limited to once per year via the Section 13 process. Separately, landlords had to serve every existing tenant with the government’s official information sheet by 31 May 2026, with civil penalties of up to £7,000 per tenancy for failure to comply.

That kind of legislative change exposes every gap in your stack. Agencies running manual compliance checklists discover they can’t easily audit whether the information sheet was sent to every tenant. Those running well-integrated systems can run a report in minutes.

Compliance isn’t a feature you add; it’s a layer you build in. Referencing, right-to-rent checks, AML, deposit protection, Section 13 notices — these need to be tracked, timestamped and auditable. Your CRM should own the record; specialist tools should feed it. Comparing your current referencing workflow against what an integrated approach looks like is a worthwhile exercise before the next audit lands.

The stack doesn’t need to be monolithic

One reason agencies defer building a proper stack is the assumption that it requires ripping out the current CRM and starting again. It doesn’t. The better model is a composable stack: a CRM at the centre, with specialist tools connecting via API to handle specific jobs they do better than any all-in-one platform ever will.

Referencing is a good example. The major CRMs are not referencing companies — the specialist depth required for affordability assessment, fraud detection, right-to-rent verification and AML checks is a product in itself. Rather than expecting your CRM to do it adequately, connect a referencing provider via API and let each system do what it’s built for. The same logic applies to inventory software, rent collection, insurance and legal protection.

Reapit’s Property Outlook Report 2025 found that nearly 80% of agencies believe it’s cheaper to invest in automation than to increase headcount. That maths only works when the automation actually connects. A stack of well-chosen, well-integrated tools compounds over time — each workflow improvement frees up capacity for the next.

Where to start if you’re reviewing your stack now

Run a workflow audit before you change anything. Map a single tenancy end-to-end and note every step that requires manual data entry, a separate login, or a phone call to chase something a system should have done. That list is your integration priority list.

From there, evaluate your CRM first. If it has a mature API and an active partner ecosystem, you can add specialist tools around it without disruption. If it doesn’t, that’s the rip-and-replace decision — and it’s better to make it deliberately than to have it forced on you by a compliance event.

PropertyGoose works as the referencing and compliance layer in any well-built lettings stack — no rip-and-replace required. References from £14 per check, a free white-label portal for your landlords, tenancy agreements included on the full-lifecycle plan, and an open API that connects directly to your existing workflow. If you’d like to see how it fits into your current setup, book a call with us and we can walk through the integration in under 20 minutes.