OptiSim builds calculation and certification tools for the built environment. Start with the BAGUS Certification Calculator — Brunei's first end-to-end green building assessment platform.
What OptiSim does
From scoring to submission — OptiSim handles the complexity so you can focus on designing better buildings.
Inputs update scores instantly across all five BAGUS parts. No spreadsheets, no manual totalling — see your rating in real time.
Set a target — Certified, Silver, Gold, or Platinum — and see exactly how many points you need in each section to get there.
Upload supporting documents directly against each criterion. Track completeness across all 22 criteria with a single dashboard view.
Generate a professional submission-ready report with score breakdown, gap analysis, mandatory requirements, and evidence register.
Save your project as a JSON file and reload it anytime. Evidence files are stored securely in the cloud — never lose your progress.
Instantly see which sections need attention and how far you are from minimum requirements — so you can prioritise design decisions early.
BAGUS Calculator
The BAGUS (Brunei Accredited Green Unified Seal) framework is Brunei's national green building rating system under the Ministry of Development. Navigating 200 points across 5 parts and 22 criteria is complex — OptiSim makes it manageable.
About OptiSim
OptiSim is a Brunei-based engineering consultancy specialising in building performance simulation and sustainable design. We build tools that make complex compliance and certification processes accessible to every design team.
The BAGUS Calculator is the first of a growing suite of tools — with energy simulation, daylighting analysis, and thermal comfort modules in development.