WhatsApp Business API for real estate: costs, rules and the 24-hour window explained

The short answer

For most builders, WhatsApp itself costs far less than people assume — replying to an inbound enquiry within 24 hours is free and unlimited, with no end date announced to that policy as of 2026. You pay Meta per message only for outbound template messages (marketing blasts, reminders sent outside an open window) at rates of roughly a rupee or less per message depending on category, plus whatever platform fee your WhatsApp software vendor charges on top. The bigger cost, in practice, is the software layer — not Meta's per-message charges.

Official API vs BSP vs unofficial tools

A quick recap, because it affects everything else in this article: the official WhatsApp Business Platform is accessed either directly or through a Meta-authorized Business Solution Provider (BSP) — this is what Wati, AiSensy and SaleHy all run on, with verified number onboarding. Unofficial "WhatsApp Web automation" tools that spoof a browser session bypass Meta's billing entirely, which sounds cheaper until you factor in that it violates Meta's terms and risks your number being banned outright. Every rate discussed below assumes the official API — see our complete guide for why that distinction matters beyond cost.

The four message categories, for real estate

• Marketing — promotional outreach the business initiates: "New tower launching in Sector 82, book a preview." Highest cost category, and the one you'll use for re-engaging cold or dormant leads.
• Utility — transactional messages tied to something the customer already did: a site-visit confirmation, a reminder before the appointment, a payment receipt. Cheaper than marketing, and this is the bulk of what an automated booking flow sends.
• Authentication — OTPs and verification codes. Real estate builders rarely use this category directly.
• Service — any free-form reply sent within 24 hours of the customer's own message. This is most of an AI sales agent's conversation with a buyer, and it's free.

What it actually costs

Meta moved from per-conversation to per-message billing on July 1, 2025, and shifted India to local INR billing from January 2026 (Meta's official WhatsApp Business Platform pricing documentation). Approximate current India rates, compiled from third-party rate trackers since Meta's own rate card is an interactive tool rather than a published table:

Category	Approx. rate (India)
Marketing	~₹0.86 per message
Utility	~₹0.12 per message
Authentication	~₹0.12 per message
Service (within 24h window)	Free

Rates via Blueticks, 2026. Meta updates its rate card quarterly — always check current pricing before budgeting rather than relying on any article, including this one.

The free lanes builders should actually use

Three ways real estate conversations stay free, straight from Meta's documentation:

The 24-hour window, precisely

It's worth separating two things that get conflated: the window is a permissions concept — what you're allowed to send without a pre-approved template. The pricing model is separate — what each category of message costs when you do need to pay. A fast reply keeps you inside the free window and able to send anything; a slow reply means the window may close, forcing a paid template message just to restart the conversation. This is the same mechanic behind why responding within minutes, not hours, matters so much — it's not only about conversion, it also keeps your messaging cost near zero.

A worked monthly cost example

For a builder handling roughly 500 inbound WhatsApp enquiries a month, with a monthly re-engagement campaign to 2,000 past leads and automated visit reminders for booked visits:

Against a SaleHy Starter plan at ₹14,999/month (or a comparable Wati/AiSensy setup), Meta's own charges are typically a small fraction of the total bill — the platform and setup are where the real cost sits, not the messages themselves.

Common mistakes

• Assuming WhatsApp is entirely free. The service window is free; marketing campaigns to cold leads are not, and can add up at volume.
• Not planning template approval time. New marketing and utility templates need Meta approval before use — submit them days before a campaign launch, not the morning of.
• Using unofficial tools to dodge these fees. The savings are real but the ban risk is too — see our note on official API vs unofficial tools.
• Letting the service window close unnecessarily. Every conversation that goes quiet for over 24 hours and needs restarting costs a template message that a faster reply would have avoided entirely.

FAQ