Hotels, guesthouses, and serviced apartments running on ERPNext quickly hit a wall: ERPNext core is built around sales orders, delivery notes, and invoices, not around a room-nights inventory, a nightly availability calendar, or a guest folio that accumulates charges across a multi-night stay. Front-desk teams end up tracking bookings in spreadsheets, keying room charges into Sales Invoices by hand, and reconciling restaurant, laundry, and spa charges to the right guest after the fact. There is no native concept of an occupancy calendar, a rate plan by season, or a housekeeping status board — so overbookings, missed incidentals, and slow checkouts become routine.

ECOSIRE builds a dedicated Frappe app — a proper hotel_management app with its own module, installed alongside ERPNext on your bench — that models the domain natively. We create DocTypes such as Room Type, Room, Rate Plan, Reservation, Folio, and Housekeeping Task, each with the right link fields, child tables, and naming series. Availability is enforced through server-side validation in hooks.py document events (validate and on_submit) that check date-range overlaps against existing reservations before a booking can be submitted, so double-bookings are blocked at the data layer rather than by front-desk discipline. Rate plans resolve nightly prices by room type, date range, and season, and the folio aggregates every posted charge — room nights, plus cross-department charges pushed from restaurant/POS, laundry, and spa — into a single running balance per guest.

The front desk works from a reservation and booking calendar and a housekeeping status board built as Frappe pages and reports, with client scripts driving quick actions like check-in, check-out, and room-move without leaving the screen. Check-out settles the folio straight into a standard ERPNext Sales Invoice and Payment Entry, so revenue, taxes, and receivables land in your existing accounts with no re-keying. Cross-department charges post to the folio via whitelisted Python methods exposed over the Frappe REST API, letting a restaurant POS, spa terminal, or laundry desk append a line to the right guest folio in real time. A nightly scheduler_events job handles the audit-style routines — rolling forward no-shows, flagging stale in-house folios, and refreshing the availability snapshot.

Everything ships permission-aware: we define role profiles and DocType permissions (Front Desk, Housekeeping, Hotel Manager, Accounts) so staff see only what their role needs, and financial posting stays gated to the right roles. The app is version-targeted to your stack — Frappe/ERPNext v15 or v16 — and delivered as clean, migratable source with fixtures for the custom roles, print formats for the guest folio and registration card, and no manual database surgery required to reinstall.

Because this is build-to-order, nothing is a black-box download. We start from your actual property setup — room types, rate structure, departments, and checkout workflow — confirm scope in writing, then build against it. Typical delivery is one working week from confirmed scope. You get the installable app, a UAT pass on a staging bench, a rollback plan, and a post-go-live support window, plus the full git repository so you (or any Frappe developer) own and can extend the code.