Design earlier
Understand likely façade constraints while massing, window area and shading can still move.
Limited launch offer · ends 30 September 2026
Know what your glazing needs before the design is locked.
Upload your commercial Revit model and get early Section J building fabric guidance, while façade changes are still practical and inexpensive.
$299 (ex GST)
Preliminary assessmentAvailable for suitable projects submitted by 30 September
- No drawing sheets required when the model contains the geometry
- Revit (.rvt) upload up to 400 MB or a private model share link
- Scope and suitability confirmed before work begins
Model analysisPreliminary design
FaçadeBy orientation
OpeningsIndividually tested
OutputU-value + SHGC
Built for commercial project teams
ArchitectsBuilding designersDevelopersCost planners
Earlier answers. Better options.
Useful glazing direction from the model you already have.
Whole-system glazing performance depends on the relationship between openings, opaque façade, orientation and external shading. We bring those pieces together early, before documentation locks in an expensive solution.
Use actual geometry
Work from the walls, openings, orientation and projections already represented in Revit.
Plan complexity
See where whole-system U-value and SHGC targets may create glazing cost or specification pressure.
What you receive
A preliminary building fabric report made for design decisions.
Outputs depend on the model and information supplied, but the assessment can include:
- ✓Glazing performance targets
Required whole system U-value and SHGC ranges.
- ✓Façade breakdown
Glazing and opaque wall areas grouped by orientation.
- ✓Opening level detail
A detailed glazing schedule and shading inputs where supported by the model.
- ✓Envelope requirements
Early wall, floor, roof and ceiling performance guidance.
- ✓Specification pressure
An indication of likely aluminium and glass complexity—not product pricing.
- ✓Clear next steps
Project specific observations to take into design development.
How it works
From Revit model to early design guidance in three steps.
- 1
Upload the model
Share the current .rvt file and a few project basics. Finished drawing sheets aren’t required when the geometry is modelled.
- 2
We confirm suitability
LittleShrub checks the model and confirms the preliminary scope and payment before the assessment begins.
- 3
Use the findings early
Receive project specific glazing and envelope direction for design and costing conversations.
Built from the model
Geometry first, not a redraw from PDFs.
The workflow interrogates the external envelope, groups façade areas by orientation and evaluates shading at individual openings. That geometry is brought into the glazing calculation to establish useful early performance targets.
01
Walls and openings measured from the model.
02
Façade areas resolved by azimuth sector.
03
Shading projections evaluated at each opening.
04
U-value and SHGC targets calculated together.
Clear scope
Preliminary guidance—not the final compliance report.
This is a preliminary, limited scope building-fabric assessment for early design and costing. It is not a complete Section J compliance report, approval certificate, construction specification or performance solution simulation.
A final assessment must review the coordinated design and the remaining Section J provisions, including relevant sealing, services, lighting, power, energy monitoring and renewable-energy requirements.
Common questions
Before you upload.
Still unsure whether the model is ready? Submit the details without a file and we’ll confirm what’s useful.
Does the Revit model need to be fully documented?+
No. The assessment is designed for earlier project stages. The external envelope, openings, orientation and relevant shading geometry need to be sufficiently represented for the analysis.
What if my model is larger than 400 MB?+
Submit the project without the file. We’ll contact you to arrange an appropriate transfer or discuss whether a detached model can be supplied.
Is the $299 ex GST assessment a complete Section J report?+
No. It is early building-fabric and glazing guidance. It does not replace the coordinated final assessment required for approval or construction.
Do I pay when I submit?+
No payment is taken on this page. LittleShrub will review model suitability and confirm the scope and payment before work begins.
Don’t wait for documentation