BUILDING SPECIFICATIONS EXPLAINED
What Is a Building Specification and Why Does It Matter?
Drawings show the design; the specification helps define what is actually to be supplied and built.
Short answer
A building specification is a written document that describes materials, products, finishes, workmanship requirements and other details that may not be fully shown on the drawings. It helps the builder price the intended quality level, forms part of the agreed construction scope and reduces ambiguity about what is included.
Watch the EBC explainer
Prime Cost Items and Provisional Sums
This EBC contract explainer demonstrates why specifications and clearly stated allowances are important to understanding what is actually included in a building price.
Plans and specifications do different jobs
Drawings communicate dimensions, layouts, elevations and construction details. The specification supplements them by describing products, materials, finishes and performance requirements.
Both documents should work together so the builder is not forced to guess the intended standard.
A specification can cover hundreds of project decisions
- ✓Windows and external doors
- ✓Roofing and cladding
- ✓Insulation and glazing
- ✓Flooring and tiles
- ✓Cabinetry and benchtops
- ✓Tapware and sanitary fixtures
- ✓Appliances
- ✓Electrical fittings and lighting
- ✓Heating and cooling
- ✓Paint systems and finishes
Clear specifications improve quote comparisons
If one builder prices premium windows and another assumes a basic allowance, the totals are not directly comparable even though the drawings are identical.
A common specification helps each builder price the same intended outcome.
The specification matters after the contract is signed
Once incorporated into the contract documents, the specification becomes an important reference for procurement, construction, inspections and resolving questions about what was included.
Selections that change after contract may need to be documented through the applicable variation process.
Planning a project like this? EBC builds home renovations, home extensions, custom new homes and knockdown rebuilds across Melbourne's Eastern Suburbs, and can talk through how this applies to your home.
Questions homeowners ask
Is a building specification the same as plans?+
No. Plans mainly show the design and dimensions, while the specification describes materials, products, finishes and other requirements.
Who prepares the building specification?+
It may be prepared by the designer, architect, building designer, builder or project team depending on the procurement method and project.
Do I need a specification before getting a quote?+
A detailed specification improves pricing certainty because builders can price the intended products and finish level rather than making their own assumptions.
Can the specification change during construction?+
Yes, but changes after contract may affect price, time and procurement and should be documented appropriately.
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Related EBC pages
- Documents Needed for a Builder Quote
- How to Compare Builder Quotes
- Building Variations Explained
- Building Contract Checklist