Presentation on theme: "CERTIFICATE 4 IN BUILDING BCGBC4004A. 18 week course First 10 weeks in classroom Following 8 in computer room 1.30pm - 5.15pm (with 15 min break) Assessments."— Presentation transcript:
Estimating means the process of working out the Expected Nett Cost of constructing a building, and preparing a Tender or price for the finished project. 1. Calculating expected nett cost of the proposed building or work 2. Setting the Tender or selling price of the building or work
Considerations: The nature and Iocation of the work Building methods and time scales Bill of quantities Labor and productivity Supervision Office backup and overheads Materials and suppliers Mechanical plant Statutory requirements-Eg W.H.S -Insurance- Licences and Permits Scaffolding Non - mechanical plant Sub – contractors On - site facilities
Most often based on the traditional detailed quantity take-off and unit price estimating method. Quantities of materials are calculated from a full set of plans: site plan floor plans Specialist drawings/reports prepared by: consulting structural engineers consulting electrical engineers consulting hydraulic engineers consulting mechanical engineers specialist suppliers (eg. reinforcing steel fabricators, precast panel fabricators) Shop fitters Arborist sections details specifications finishes Schedules
Builder will need to: Study the drawings, specifications and bill of quantities Carry out a site visit Develop a method statement Prepare a preliminary construction program- (duration of the building works for accurate costing time related Preliminaries) Seek quotations for materials supply, sub-contract work and possibly plant hire- (especially relatively long-term items such as scaffolding)
Factors Determining the Tender/ Selling price The project risk Current state of the market Company policy (profit and mark ups) Importance of winning or losing the particular project So the Tender price = Expected Nett cost + Profit/Markup (if successful the contract will be based on this figure)
Definition- A bill of quantities is a list of numbered or coded items describing quantities and materials required to carry out the contract work that is divided into sections corresponding with their usual building trade and in accordance with the ASMMBW. A bill of Quantities- Is prepared by a trained Quantity Surveyor according to the ASMMBW. provides a common basis for tendering prevents differences of opinion/interpretation of the drawings and specification. a thorough check of the drawings and specification.
A formal BOQ is prepared according to ASMMBW. Arranged in trade order typically as you would construct Measure only the finished product - (no allowance for waste or laps) All dimensions before calculating to 2 decimal places Do not deduct for openings < 1m 2 or voids < 0.1m 3 in volume State dimensions in order of length, width and height or depth Units of measurement should be m, m 2, m 3, tonne (steel) All Billing quantities should be billed whole numbers. (except steel which is billed to 2 decimal places)
All ITEMS listed in alphabetical order and the first item on every page is A All descriptions shall adequately cover the work being measured as per the ASMMBW, but common methods of construction or stock sections need not be described in detail. The functions of the five columns in the PARTICULARS column shall be strictly observed and carefully set out in accordance with the general practice of a quantity surveyor. All dimensions are in metres and shall be taken to two decimal places In the dimension column horizontal Iines are used to signify the differences between linear, area, volume, number and weight measures. The measurement paper shall be spaced well apart to ensure clarity Headings and sub-headings are recommended to clearly identify section and sub- sections of a trade and shall be underlined The billing UNIT shall be in accordance with the ASMMBW The billing UNIT shall be placed adjacent to the last line of the description, followed by the extended measured QUANTITY, in their appropriate columns.