F205PCC Project cost and control

The cost control process of a project at design stage. (forecasting and controlling)

Procurement straregies for projects.(contractor selection techniques)

The cost control process of a project at design stage. (forecasting and controlling)

relationship between the RIBA plan of work  and pre contract cost control processes

A APPRAISAL order of cost estimate

B DESIGN BRIEF Collation of cost data

C CONCEPT Formal cost plan 1 (elemental cost plan based on group elements using GIFA m2)

D DESIGN DEVELOPMENT Formal Cost Plan 2 (elemental cost plan based on EUQ)

cost planning - The cost plan prediction is usually taken to be a a 'fair price for the work'

  •  ensure the sum of money the client sets out is not exceeded.
  • client obtains good value for money
  • provides cost information based on proposals by client and designers
  • provide advice resulting in balanced expenditure
  • provide cost information to allow for informed decisions
  • avoids difficulties and complications which arise when tender exceeeds estimates

in practice:

  • cost planning does not allow for  different architects preferences or contractors estimating practices- these are unknown to the cost consultant.
  • more reliable estimates of costs can be acheived if based on costs known to consultant and the architect is well known.
  • difficult to predict future price changes
  • costs expressed per m2 of GIFA are not helpful of decisions based on quality. unit quantity prices (cost per m2 windows) are better understood
  • decline in bills of quantities may lead to a lack of suitable analyses.

sources of cost information

  • priced bills of quantities (although in demise)
  • final accounts
  • Prepared cost analyses based on tenders and final accounts (most reliable) due to factors encountered
  • Price books
  • Analyses published in trade and professional journals
  • cost indices
  • special information based on cost trends published in periodicals

Design and site factors that impact cost of a project, appreciating effects on different types of buildings; impact on the element and buiding as a whole

factors that influence cost of a building (consider and explain the impact on costs on elements affected):

  • Design
    • Plan Shape - changes in shape have little impact on floor area, the changes in perimeter length will affect external walling, foundations, eaves construction and detailing, heat loss and gain- and therefore elements associated with heating/air conditioning.
    • Grouping of Buildings- saving in combined use of seperating wall over external walls,
      • depth of floor joists may alter de/increasing height of building (slightly)
      • lengths of eaves and gutters change - ammount of downpipes
      • storey height; impact of increasing storey height eill be on vertical elements, walls, partitions, finishing and decoration, stairs, services (not always proportionately- eg lift car). increased volume will impact heating requirements (plantsize/additional cabling ducting; additional strengthening of foundations
      • size of building, cost does not rise in proportion to increase in size of a building, large buildings, consideration needs to be applied to special requirements of services
      • circulation space consists of entrace halls, corridors, staircases etc, important factor of design; lettable floor area is less space taken up by circulation space (which needs to…


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