Building Inspections (BI) / Bill of Quantities (BOQ)


Building Inspections

The two building inspections included with OBSN membership are conducted at two integral stages of your build. The building inspector will review your plans and based on the design of your project, will recommend when they should be undertaken.

Generally, they are conducted 1.) When the roof framing is in place with fixings – prior to the roof going on and 2.) At either lock-up or practical completion. There is also an opportunity to request a dilapidation inspection / report in lieu of one of your building inspections.

The two building inspections are catered to your individual project and there is no ‘one size fits all’ when it comes to your inspections.

The inspections are performed by Dave Waters of Jim’s Building Inspections who carries the appropriate Professional Indemnity Insurance and Public Liability insurance to undertake these inspections.

Dave is a Perth-based builder with over 30 years’ experience in the building industry.  He has extensive expertise in all aspects of construction for both residential and small-scale commercial projects, new builds, renovations and building maintenance.

Booking your building inspection

Whilst we highly recommend booking your building inspections based on project hold points in your project schedule and any requirements set down by your consulting engineer, as the owner-builder, you can decide when you would like the inspections undertaken.

To arrange an inspection, email, giving details of project stage and preference day for the inspection.

Dave will contact you to arrange a suitable time and day for the requested building inspection.

Prior to his arrival on site you will be asked to sign and return a Pre-Inspection Agreement – which can be viewed here: Pre-Inspection Agreement PDF

It is recommended that you be in attendance on the designated day of the building inspection. This is an opportunity to ask questions and raise any concerns.

You will also need to have the following documentation available on-site, which will be viewed by the inspector and their and their sighting will be documented in your building inspection report;

  • Construction plans
  • Engineering drawings
  • Termite treatment warranty
  • Compaction certificate
  • Demolition permit (if applicable)

Why are building inspections important?

As an owner-builder you have the responsibilities of a builder. This includes site safety and construction compliance with your permitted plans and the NCC and Australian Standards. Building inspections provide a cross check for the structural integrity of your build.

You will be issued with full building inspection reports (BIR) which are an integral part of your construction audit. Your BIR can also be submitted to your local authority as part of your Notice of Completion (BA7) documentation.

Objectives of two stage inspections

Professionally undertaken building inspections will ensure the dwelling is built in a manner that will provide a safe and healthy environment for all those that will inhabit the building. Building inspections are also designed to represent the client’s interests and confirm that the works;

  • Are free of safety hazards
  • Do not have major defects
  • Are executed within the acceptable Standards and Tolerances in respect of Minor Defects
  • Are completed in accordance with the stage definition
  • Are executed to an acceptable level of industry workmanship
  • Wherever possible (and within the bounds of the inspector’s knowledge and qualification) identify suspected non-compliance or poorly executed workmanship. If related to trades, plumbing, gas, electrical etc, they will be referred for further inspection by suitably qualified individuals.
  • Are in accordance with the contract for the installation of the slab, frame and fixings
  • Are compliant to the applicable Australian Standards
  • Conform to NCC (BCA)

Bill Of Quantities (BOQ)

From 1 July 2020 we have introduced the option of having a Bill of Quantities up to the value of $1,000 (including GST) created for your individual project.

Should you choose this service, it is provided in lieu of the two building inspections mentioned above.

The introduction of the BOQ offering is timely following an increase in enquiries from owner-builders outside of the Perth metropolitan area. Whilst we are unable to offer building inspections to non-metro members, they now have an opportunity to access a personalised BOQ for their project. This document will also prove beneficial to those who decide to engage a builder for all or part of their project.

A Bill of Quantities is a valuable tool for the owner-builder, as it quantifies materials and labour – providing a cross reference for the all-important budget.

Once you have requested your BOQ, you will be supplied with a scope of works document that will identify any additional charges for this service, over and above the $1,000 (including GST) allocated. The scope of works will also itemise all provisional sum (PS) allowances as discussed with the OBSN member.

Booking your Bill Of Quantities (BOQ)

We recommend booking your BOQ at the preliminary stage of your project as more often than not, the budget has a defining impact on the project and materiality used. This document is also valuable when applying for finance and will become an integral part of your project, alongside the project schedule. To find out more about the BOQ please email

Typical Bill Of Quantities (BOQ) inclusions 

Please note: This is an example of inclusions, actual inclusions will vary depending on your project scope.

1. Prelims: set-up and running

2. Site clean

3. Site labour

4. Scaffold: mobile and fixed if required

5. Bins allowance

6. Cranage allowance and materials handling

7. Temp services: connect/disconnect

8. Safety allowance

9. Site amenities

10. Site hoarding and temporary fencing

11. Site works and retaining/fencing (after demolition)

12. External paving allowance

13. White ant pre-treatment

14. Concrete works: supply

15. Concrete works: install inc. pump

16. Reinforcement supply

17. Reinforcement: install

18. Formworks for ground slab and suspended slab (part of concreter)

19. Brickwork/blockwork: supply

20. Brickwork/blockwork: for labour

21. Brickwork/blockwork: hardware supply associated

22. Brickwork/blockwork: cartage

23. Swimming pool: provisional sums

24. Steel works associated with structure

25. Brick cleaning associated with brickwork face

26. Roof and floor carpentry works

27. Associated hardware supply

28. Carpentry/fixing carpentry: labour

29. Cabinetworks and tops: supply and install

30. Residential door hardware: depending on specification (windows)

31. Aluminium windows and doors/glazing – commercial

32. Roofing supply and install metal decking

33. Roof plumbing: gutters and rainwater pipes

34. Specified external cladding

35. Internal doors: supply and install

36. Garage door: panel lift

37. Associated door furniture – subject to schedule supplied

38. Plumbing fixtures per schedule including PV cell if applicable

39. Hot water unit and appliances – subject to schedule supplied

40. Wall and ceiling plasterboard: finishes supply and install

41. Wall and ceiling plasterboard: insulation to ceilings/roof and walls

42. Wall and floor tiling finishes: supply and install

43. Shower screens and associated mirrors/glazing

44. Painting external and internal: supply and install

45. Floor finishes such as carpets/timber floors

46. Lighting PC allowance

47. Electrical: labour and materials provisional sum allowance budget

48. Plumber labour and materials: provisional sum allowance budget

49. Storm water allowance: soakwells plus associated pipework – provisional sum budget

50. A/C allowance based on reverse-cycle ducted system – provisional sum budget

51. Solar provision

52. Laser cut screens

53. Louvre systems

54. Timber decking