Measurement Estimator — Cheat Sheet
Quick-reference cheat sheet for the Measurement Estimator tool.
Published 27 May 2026
Measurement Estimator
Quick-reference companion for the free Portal tool
What This Tool Does
The Blind Solutions Measurement Estimator is a powerful online tool designed specifically for South African architects to quickly and accurately estimate the glazing area required for their projects. It streamlines the initial design phase by providing a reliable calculation of window and door openings, helping you determine preliminary material quantities and budget allocations for fenestration.
Use this tool early in your project lifecycle – during concept design or schematic design – to get a rapid assessment of glazing requirements. It's invaluable for architects, architectural technologists, and even quantity surveyors who need a quick, data-driven estimate without diving into detailed CAD drawings.
Beyond simple area calculation, the tool considers typical South African building typologies and can help flag potential SANS 10400-XA compliance considerations related to glazing ratios, especially in conjunction with other energy efficiency tools available on the portal.
Step-by-Step Usage Guide
Begin by entering your project's basic details. This includes the Project Name (e.g., "Parkhurst Residence"), Client Name, and critically, the Project Location. For South African projects, select your province and then input the specific city or town. This helps the tool infer relevant climate zone data for future enhancements.
Project Name: "Sandton Office Block"
Client Name: "MegaCorp Holdings"
Province: "Gauteng"
City: "Johannesburg"
Select the general building type (e.g., "Residential - Single Storey", "Commercial - Multi-Storey"). Then, provide the primary orientation of the building. This information is crucial for understanding solar heat gain implications and potential SANS 10400-XA considerations.
Building Type: "Residential - Double Storey"
Primary Orientation: "North-Facing"
Add individual wall sections that contain glazing. For each section, input its total length and height. This defines the gross wall area before subtracting for openings. You can add multiple wall sections (e.g., "North Wall", "East Facade", "Living Room Wall").
Wall Section 1: Name: "North Living Area Wall", Length: 8.5m, Height: 2.8m
Wall Section 2: Name: "South Bedroom Wall", Length: 6.2m, Height: 2.8m
Within each defined wall section, add individual glazing units (windows or doors). For each unit, specify its width and height. The tool will automatically calculate the area of each unit and subtract it from the gross wall area to determine net wall area and total glazing area.
Glazing Unit 1: Type: "Sliding Door", Width: 3.0m, Height: 2.1m
Glazing Unit 2: Type: "Fixed Window", Width: 1.5m, Height: 1.2m
Example Input (for "South Bedroom Wall"):
Glazing Unit 1: Type: "Casement Window", Width: 1.2m, Height: 0.9m
Once all wall sections and glazing units are entered, click the "Calculate" button. The tool will instantly display a summary of your project's estimated glazing area, net wall area, and a glazing-to-wall ratio. You can then download a detailed report in PDF format for your records or client presentations.
Total Gross Wall Area: 41.16 m²
Total Glazing Area: 10.98 m²
Glazing-to-Wall Ratio: 26.67%
The tool is designed for quick iteration. Modify dimensions, add or remove glazing units, and recalculate to see the immediate impact on your estimates. This is particularly useful when exploring different design options or aiming for specific SANS 10400-XA compliance targets.
Common Scenarios & Expected Results
| Scenario | Input | Expected Output |
|---|---|---|
| Small Residential Window Schedule |
Project: "Cape Town Cottage" Wall: North-facing, 5m(L) x 2.7m(H) Glazing 1: 1.2m(W) x 0.9m(H) Casement Glazing 2: 0.6m(W) x 0.6m(H) Bathroom |
Gross Wall Area: 13.5 m² Total Glazing Area: 1.44 m² Glazing Ratio: 10.67% |
| Commercial Office Facade |
Project: "Pretoria Business Park" Wall: West-facing, 25m(L) x 3.5m(H) Glazing 1: 10 units of 1.8m(W) x 2.1m(H) Fixed Panel |
Gross Wall Area: 87.5 m² Total Glazing Area: 37.8 m² Glazing Ratio: 43.2% |
| Large Glazed Living Area |
Project: "Durban Beach House" Wall: East-facing, 12m(L) x 2.4m(H) Glazing 1: 4.5m(W) x 2.1m(H) Stacking Door Glazing 2: 3.0m(W) x 2.1m(H) Fixed Panel |
Gross Wall Area: 28.8 m² Total Glazing Area: 15.75 m² Glazing Ratio: 54.69% (Potential SANS 10400-XA flag for energy review) |
Pro Tips
SANS 10400-XA Compliance Check
While this tool provides the glazing-to-wall ratio, always cross-reference with SANS 10400-XA requirements for your specific climate zone and building type. A high glazing ratio, especially on east/west facades in hotter zones (e.g., Durban), might require further energy modelling or specific glazing specifications (e.g., low-E glass, external shading) to comply.
Early Budgeting & Procurement
Use the total estimated glazing area to get preliminary quotes from Blind Solutions or other fenestration suppliers. This helps in early-stage budget planning and can highlight cost implications of extensive glazing early in the design process.
Standard vs. Custom Sizes
When inputting dimensions, consider if you are using standard South African window and door sizes (e.g., 900x900, 1200x1200, 2100x900 door) or custom dimensions. Standard sizes often lead to more cost-effective solutions. The tool accommodates both, but keep this in mind for procurement.
Iterate for Optimisation
Don't be afraid to experiment! Change window sizes, add or remove units, and observe the impact on the glazing ratio. This iterative process allows you to optimise for aesthetics, natural light, and energy performance simultaneously.