Residential DTS Glazing Schedule Guide | Certified Energy

A glazing schedule prepared for an elemental residential DTS assessment should clearly identify the windows and glazed doors included in the proposed building envelope.

Relevant information commonly includes opening identifiers, dimensions, locations, orientation, window-system performance values and any external shading relied upon in the assessment.

The schedule should be consistent with the current architectural plans, elevations and other supporting drawings.

Preliminary product assumptions may be sufficient for an initial review, but the final documented window systems must align with the performance values and configuration relied upon for compliance.

For the wider compliance framework, visit the Residential DTS Knowledge Hub.

 

The glazing schedule provides a practical connection between the architectural design and the window information used in the elemental assessment.

A floor plan may show where a window is located, while an elevation shows its proportions and relationship to the façade. The glazing schedule brings together the information needed to identify that opening and establish its proposed specification.

Where the schedule is coordinated, the assessor can more readily determine which windows are included in the calculation and whether the nominated performance values correspond with the intended design.

A clear schedule can help project teams:

• identify each relevant window and glazed door;
• confirm the dimensions used in the assessment;
• coordinate glazing performance information;
• identify openings affected by external shading;
• reduce inconsistencies between drawings and schedules;
• manage product substitutions; and
• maintain consistency between the assessed and constructed design.

The schedule does not replace the applicable NCC glazing calculations. It provides supporting information for the assessment and helps communicate the specified window configuration.

The technical requirements themselves are explained in Residential DTS Glazing Requirements: What Must Be Checked?.

 

Each relevant glazed opening should be identifiable across the architectural drawings and glazing schedule.

Consistent window references help the assessor connect the scheduled information to the correct location, orientation and dimensions.

Useful schedule fields may include:

• a unique window or glazed-door identifier;
• the room or building location;
• the relevant elevation or orientation;
• the scheduled width and height;
• the opening or window-system type;
• the quantity of identical openings where applicable;
• the proposed frame and glazing configuration; and
• references to the relevant plans or elevations.

Dimensions should be clearly defined. A rough opening, overall frame dimension and visible glass dimension are not necessarily the same measurement.

The area used in the glazing assessment must follow the applicable calculation method, so the schedule should provide dimensions that can be reconciled with the assessed area.

Where multiple windows have the same dimensions and specification, they may be grouped for documentation purposes if the assessment information remains sufficiently clear.

However, openings on different orientations or with different shading conditions should not be treated as interchangeable merely because they use the same window product.

 

Window thermal performance information is an important part of the glazing schedule where it is relied upon in the elemental assessment.

The two principal values are the total-system U-value and the total-system solar heat gain coefficient, commonly referred to as SHGC.

These values describe different aspects of window performance and should not be used interchangeably.

The schedule should make it clear:

• which window system is proposed;
• which total-system U-value applies;
• which total-system SHGC applies;
• whether the values are preliminary or confirmed;
• which product or performance information supports the nominated values; and
• which openings use the relevant specification.

A glass-only performance value should not automatically be substituted for a total-system value that includes the frame and glazing assembly.

Where the exact window manufacturer has not yet been selected, preliminary performance targets may be used for an initial assessment where appropriate. Those targets should be clearly identified as assumptions rather than confirmed product specifications.

The final selected window system must be checked against the performance assumptions used to establish compliance.

 

The orientation of a glazed opening can influence the applicable elemental glazing assessment.

For this reason, window locations should be coordinated with a clearly identified building orientation on the architectural drawings.

A schedule that identifies every window only by room name may be insufficient where the assessment needs to distinguish openings on different elevations.

External shading should also be documented where it is relied upon in the relevant NCC calculation.

Supporting information may include:

• the orientation of the relevant glazed opening;
• the location of fixed eaves, awnings or balconies;
• the projection depth of relevant shading elements;
• the position of shading relative to the window;
• the height and width of the glazed opening;
• relevant sections or elevation references; and
• any other geometry required by the applicable assessment method.

A note describing a window as shaded does not necessarily provide enough information to support a calculation.

The relevant geometry should be identifiable in the drawings so that the shading assumption can be checked and carried through to construction.

If an eave, balcony or awning changes during design development, the associated glazing assessment may need to be reviewed.

 

A glazing schedule should describe the same window configuration shown on the current architectural drawings.

Differences between the schedule, floor plans and elevations can create uncertainty about which dimensions and specifications should be assessed.

Common coordination issues include:

• a window appearing on an elevation but not in the schedule;
• different dimensions recorded for the same opening;
• window identifiers changing between drawing revisions;
• a glazed door being omitted from the glazing information;
• an elevation showing a different window configuration from the floor plan;
• shading dimensions not matching the relevant section;
• different glazing specifications being assigned to the same opening; and
• the schedule referring to a superseded drawing revision.

These inconsistencies do not necessarily indicate that the design itself cannot comply. They can, however, prevent the assessor from confidently establishing the proposed glazing configuration.

A coordinated drawing issue should include clear revision information so that the assessment can be linked to the appropriate design version.

This is especially important where several consultants, designers or suppliers are contributing information during the documentation stage.

 

A residential DTS review may begin before the project team has selected the final window manufacturer or product range.

At this stage, the assessment may use nominated performance assumptions or target values where the assessor considers them appropriate for the preliminary review.

The distinction between preliminary assumptions and final specifications should remain clear throughout the documentation process.

For a preliminary review, the project team may be able to provide:

• proposed window dimensions and locations;
• anticipated window and frame types;
• nominated total-system performance targets;
• the relevant building orientation;
• documented fixed shading; and
• current architectural drawings.

For final documentation, the nominated products or enforceable performance specifications must align with the values and assumptions relied upon in the assessment.

A window product with a different U-value or SHGC may change the compliance outcome even when its dimensions and appearance remain similar.

Product substitutions should therefore be reviewed before the project relies on an earlier glazing assessment or finalises the construction specification.

 

A glazing schedule does not need to be unnecessarily complex. It does, however, need to contain information that can be reconciled with the proposed design and the assessment method.

Common omissions or inconsistencies include:

• missing window or glazed-door identifiers;
• dimensions that differ from the architectural elevations;
• unclear opening types or glazing configurations;
• missing total-system U-values or SHGC values;
• glass-only values being presented as complete window-system performance;
• unconfirmed product assumptions being presented as final selections;
• missing building orientation information;
• shading assumptions without supporting dimensions;
• window schedules that do not reflect recent design changes; and
• inconsistent drawing and schedule revision numbers.

The practical effect is often additional correspondence, revised schedules or a request for updated architectural information.

Where a compliance calculation has already been completed, an unresolved discrepancy may also require the glazing configuration to be reassessed.

A coordinated schedule can reduce these avoidable interruptions without adding unnecessary complexity to the documentation package.

 

Before the glazing information is issued for assessment, the project team should check that the schedule is complete enough for the relevant review and consistent with the current architectural design.

The purpose is not to duplicate every drawing detail within the schedule. It is to ensure that the assessor can identify the proposed windows and obtain the information needed for the applicable calculation.

A practical pre-submission review should consider whether:

• all relevant glazed openings have been included;
• identifiers match the plans and elevations;
• window dimensions are clear and consistent;
• the building orientation is established;
• performance values are provided or clearly identified as preliminary;
• relevant shading information is documented;
• the schedule refers to the current drawing revision; and
• any unresolved product selections or design assumptions are disclosed.

Where information is still being developed, clearly identifying the outstanding items can help the assessor distinguish between an initial pathway review and documentation intended to support a final compliance outcome.

For the broader documentation package, see Preparing Residential DTS Documentation for Certifier Review.

 

• Confirm the applicable residential DTS assessment pathway.
• Use the current architectural drawing revision.
• Assign consistent identifiers to relevant windows and glazed doors.
• Record the appropriate window dimensions.
• Identify the location and orientation of each opening.
• Record the proposed window and frame systems.
• Include total-system U-values and SHGC values where required.
• Identify preliminary assumptions separately from confirmed specifications.
• Document fixed shading relied upon in the assessment.
• Check glazing information against plans, elevations and sections.
• Identify outstanding product selections or design decisions.
• Review substitutions and revisions before final documentation is issued.

 

Does a residential DTS assessment need a glazing schedule?

An elemental glazing assessment requires sufficient information to identify and evaluate the relevant windows and glazed doors. A coordinated glazing schedule is a practical way to provide that information, although the exact documentation format depends on the project and assessment requirements.

What window dimensions should be included?

The schedule should provide dimensions that allow each relevant glazed opening to be identified and its assessed area established in accordance with the applicable method. The dimensions should be clearly defined and consistent with the architectural drawings.

Do I need final window products before starting a DTS assessment?

Not necessarily for an initial review. Preliminary window performance assumptions may be used where appropriate, provided they are clearly identified. The final specified window systems must align with the performance information relied upon for the compliance outcome.

Should U-values and SHGC be included in the schedule?

Where these values are used in the elemental glazing assessment, they should be recorded or otherwise clearly linked to the relevant window specifications. The information should describe the appropriate total-system performance rather than only the glass component.

Do shading dimensions need to be documented?

Yes, where fixed external shading is relied upon in the relevant glazing calculation. The supporting drawings should provide sufficient geometry to establish and verify the shading assumptions used in the assessment.

What happens if the glazing schedule changes after the assessment?

Changes to window dimensions, locations, orientation, shading or thermal performance may affect the original assessment. The revised information should be reviewed before the earlier compliance outcome is relied upon for the updated design.

Residential DTS Knowledge Hub

Understand the elemental compliance pathway, applicable building provisions, project suitability and assessment process.

Residential DTS Glazing Requirements

Understand the technical glazing provisions, including U-values, SHGC, orientation, shading and the relevant NCC calculations.

DTS Documentation for Review

Coordinate architectural drawings, construction specifications and compliance information for approval-stage review.

Design Decisions and DTS Compliance

Explore how window placement, shading, building form and construction choices influence residential elemental DTS during design development.