Apartment building management — rent, service fees, utilities, and the payment ledger.
Built in house by qbittco, Dalan replaces error-prone spreadsheets with a mathematically rigorous financial ledger for residential landlords and property societies. Engineered with minor-currency poisha accounting, effective-dated rent revisions, caretaker audit trails, Bengali localization, and automated SMS alerts.
Most apartment owners in Dhaka track their buildings in a spreadsheet or a physical notebook. It works for a few months, until reality intervenes:
Dalan (দালান) was engineered by qbittco to replace makeshift sheets with an unshakeable financial ledger built specifically for the realities of property management in Bangladesh.
Poisha-Precision Ledger (BIGINT Minor Units)
Financial numbers are never stored as floating-point decimals. Every taka is stored in minor units (1 taka = 100 poisha) as a 64-bit integer, eliminating IEEE 754 rounding drift. Calculations are converted to display format only at the user interface boundary.
Derived Invoices & Many-to-Many Allocations
Invoices do not store a static, mutable status column. Instead, invoice status is computed at query time:
\(\text{Balance} = \sum(\text{Invoice Lines}) - \sum(\text{Allocations for Non-Voided Payments})\)
Overpayments roll forward effortlessly, partial payments apply across specific line items, and advance balances draw down cleanly without manual ledger balancing.
Effective-Dated Fee Schedules with Exclusion Constraints
Fees and rent are stored as date-bounded intervals (daterange). Using PostgreSQL’s btree_gist extension, database-level exclusion constraints physically prevent overlapping fee schedules per unit. Future rent increases can be scheduled months in advance with full confidence that past billing cycles remain immutable.
Bangladesh-Centric Payment Rails & Operations
Designed around local collection methods: Cash with caretaker handover tracking, bKash, Nagad, and direct bank transfers. Integrated with BulkSMSBD for automated billing notifications, payment receipts, and overdue alerts.
Full Bilingual Localization (English & বাংলা)
Built with next-intl to provide complete native interfaces in both English and Bengali across all building, unit, billing, reporting, and maintenance management screens.
Explore the live platform at dalan.qbittco.com.
All monetary values are stored as 64-bit integer poisha (1 taka = 100 poisha) with zero floating-point drift. Invoice balances are dynamically derived from payment allocations, ensuring an audit trail that never goes out of sync.
Rent and recurring service charges are modeled as effective-dated schedules with PostgreSQL exclusion constraints. Future rent increases can be scheduled in advance and apply automatically on their effective date without touching historical invoices.
Tailored for property operations in Bangladesh. Caretakers log physical cash collections with timestamped audit logs, named receivers, and reconciliation summaries for the landlord before cash is handed over.
Bulk monthly meter entry for unit electricity, gas, and water. Configurable shared-pool formulas apportion generator diesel, common-area lighting, and water pump bills cleanly across occupied units.
Occupants can review monthly itemized statements, payment histories, and download printable receipts via phone-number login codes without requiring complex passwords.
Native BulkSMSBD integration for instant rent notices, payment receipts, and overdue alerts. Full bilingual support in both English and Bengali (বাংলা) across all operational screens.
Transparent subscription plans designed for Bangladeshi landlords, family properties, and residential societies.
৳999 /month
For single apartment buildings & family properties.
৳1,499 /month
For growing landlords and multi-floor buildings.
৳2,999 /month
For developers, large societies, and management firms.
Send the goals, constraints, and timeline. You get a reply within one business day with next steps — not a brochure.