Quantification And Costing Flashcards
Talk me through NRM and differences between 1,2 and 3.
NRM_1 Order of cost estimating and cost planning
NRM_2 Detailed measurement for building works
NRM_3_Building Maintenance Works
What is IPMS?
International property measurement standards. Introduced to standardise property measurement across the world. Research has found that measurements have been up to 24% different.
Can you tell me what the difference between NRM 1 and 2 are and how this differs from the RICS Code of Measurement.
RICS code of measurement practice is now obsolete but described the different areas used in property.
NRM is measurement rules for construction and lifecycle costing work.
GIFA v GEA v NIA
GEA - Gross external area (IPMS 1)
GIA - Gross internal area (IPMS 2)
NIA - Net internal area (IPMS 3)
Replaced by IPMS from January 2018, RICS professionals are expected to adopt the Property Measurement Professional Statement in place of the Code for offices and Residential unless local laws, or a client require an alternative. Professional Statements for other property classes including industrial and retail will be added over time as the IPMS is expanded.
When did the IPMS residential come into effect?
May 2018
What is the difference between IPMS and code of measurement practice?
IPMS defines GEA, GIA and NIA as IPMS 1, IPMS 2, IPMS3. It is used worldwide not just the UK, and there are slight measurement differences, most notably internal dominant face.
What is the internal dominant face?
The inside finished surface comprising 50% or more of the surface area for each vertical section forming an internal perimeter.
What are the benefits of having a standard method of measurement?
1) Provides structure for information
2) Defines units of measurement for different items (m, m2, m3, t)
3) Provides rules as to what is included within each item
4) Defines terms used to avoid disputes
5) Allows familiarity to development so measurement becomes quicker and easier
6) Provides clear system of structuring other project information
What are the different methods of measurement for a Cost Estimate?
1) Functional Unit
2) Floor Area
3) Elemental
4) Approximate Quantities
5) Bill of Quantities
What is a Prime Cost Sum?
The term ‘prime cost sum’ (PC sum) is an allowance for the supply of labour, plant and materials to be provided by a contractor or supplier that will be nominated by the client. The allowance is exclusive of any profit mark up or attendance (such as material handling, scaffolding and rubbish clearance etc) by the main contractor.
What is the Contractor deemed to have allowed for within a prime cost sum?
A prime cost is exclusive of profit or attendance by the contractor.
How are prime costs adjusted?
They are finalised based on invoices of the supplied items, plus an amount for overheads and profit for the main contractor.
How would you advise preliminaries are cost on a CSA?
I would suggest that these are projected using NRM1 or NRM2 depending on the procurement of the project.
What are the preliminaries?
These are part of the tender and contract documents which provide a methodology of the project and how it will be built. The costs of this will form part of the project cost however will not be part of the actual construction. The NBS provide a guideline of a preliminary document which describes the work in whole.
What was the concrete rate in the Bristol area compared to London?
This was at £175/m3 compared to £185/m3 in London.
Why do costs vary per region?
- Local labour costs
- Vicinity of sites in relation to amenity
- Travel distances and existing land conditions
- Availability of local and specialised labour
- Ease of access to the site
- Transportation routes and costs.
What is the difference between IPMS 1 and GEA?
- Balconies are to be measured in IPMS but listed seperately. Excluded from GEA
- covered galleries are to be stated seperately in IPMS but as part of GEA in comp
What is the difference between IPMS 2 and GIA?
- areas occupied by reveals of windows (IDF) included within IPMS but excluded from comp
- balconies, roof terraces and mezzanines to be measured seperately in IPMS
What is the difference between IPMS 3 A, B and C?
- IPMS 3a is the effective internal areas including external walls and equates to GEA.
- IPMS 3b is the effective internal areas including internal walls and equates to GIA
- IPMS 3c is the area of exclusive occupation, excluding floor areas occupied by internal walls and columns.
- All of IPMS 3 excludes communal areas and voids.
Why did the NRM replace SMM7?
- There was no distinguish between cost estimates, plans and BofQ.
What does the NRM1 provide guidance for?
- OCE
- Cost Planning
- Includes:
- Facilitating works
- Building works
- Main contractor prelims
- Main contractor OHP
- Project/ design team fees
- Other development costs
- Risk (4 types)
- Cost limit
- Inflation
What checks can you do to ensure BIM quants are correct?
- Compare 2D GIA measures with ceiling and floor finishes
- Check if elements stop at interfaces, eg. columns at slabs
- Have objects replaced elements that impact on quantity checks. Eg. Complete lift core as an object.
What does the NRM state needs to be included for a provisional sum to be defined?
- The nature and construction of the work.
- A statement of how and where the work is fixed to the building and what other work is to be fixed thereto.
- A quantity or quantities that indicate the scope and extent of the work.
- Any specific limitations and the like.
What does fair and reasonable mean under the JCT?
This means that an agreement must be made with the contractor and EA. The cost must be built up how it is in the pricing document – for example multiple quotes from subcontractors or through first principles.
