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MMC vs Traditional
- Value
- Not a question
of lowest cost
- Need to maintain and
increase quality
- Durability
- Life-time running costs
- Sustainability
- Durability
- Speed
(government
requirements)
- Not a question
of lowest cost
- Labour savings
- Volumetric approach
allows a quarter of
on-site labour
- Greater saving
available with
different cladding
- Greater saving
available with
different cladding
- Factory based production not
the same labour pull as
on-site construction
- Not competing for the
same skills
- Not competing for the
same skills
- Volumetric approach
allows a quarter of
on-site labour
- Time savings
- Can half the time
on site
- Time to achieve water-tightness
quartered
- Quality protected as no
weather damage
- Improved working condidtions
- Quality protected as no
weather damage
- These saving are only available with the use of process
plans tailored to match the method of construction and
followed appropriately
- Can half the time
on site
- Relationship with planning
authorities
- Good relationship required to
keep off-sire production off the
critical path
- Otherwise on-site savings
are replaced with off-site
time
- Nullifies benefits of MMC
- Nullifies benefits of MMC
- Otherwise on-site savings
are replaced with off-site
time
- Manufacture needs to take
place at point of outline
planning permission
- During process required
regardless of method
- During process required
regardless of method
- Discussion before initial planning
application, not after submission
- "Recommendation of approval"
before formal approval
- Allows works to
continue
- Allows works to
continue
- "Recommendation of approval"
before formal approval
- Good relationship required to
keep off-sire production off the
critical path
- Costs
- Baker Report (2004)
- "The time savings available do not currently
provide a compelling financial reason to
switch production"
- "The time savings available do not currently
provide a compelling financial reason to
switch production"
- Generally MMC is more
expensive
- Open panels are the exeption
- Cost competitive with traditional
- Cost competitive with traditional
- Open panels are the exeption
- Time benefits bridge a
third of the gap
- Rent quicker
- Less snagging
- Higher quality
control on factory
- Higher quality
control on factory
- More off-site construction means
less on-site inspection
- Rent quicker
- Aim to build homes for
£60 000
- £784 per square meter
- Achievable by MMC
- Achievable by MMC
- £784 per square meter
- For/Against MMC
- Favour MMC
- Poor soil conditions
- Restricted working space
- More storeys
- Rooms in roof
- Poor soil conditions
- Against MMC
- Late design
changes
- No standard design
- Late appointment of
contractor/supplier
- Need to
suspend
operations
- Late design
changes
- Favour MMC
- Baker Report (2004)
- Capacity
- Most suppliers could cope with a
doubling demand by using spare
capacity
- Increase in demand would
cause an increase in price
- Until more capacity
became available
- Price would then
go back down
- Price would then
go back down
- Until more capacity
became available
- Most suppliers could cope with a
doubling demand by using spare
capacity
- Quality Issues
- Durability
- 60 years as standard
- Degradation same for
all methods
- Off-site manufacture
doesn't enhance duarbility
- Factory production
should reduce risk of
non-conformities
- Factory production
should reduce risk of
non-conformities
- 60 years as standard
- Whole Life Costs
- The same for all methods
- May be less components failing early
dud to factory production
- The same for all methods
- Perfmorance
- Will meet the
standards
- Will meet the
standards
- Durability
- Risk Management
- Different risks
- Not price fluctuations
during construction
- Not delays due to bad
weather
- Unpredictable planning
- Non-suitable design for
MMC
- Not price fluctuations
during construction
- Risk higher earlier on
- Specific risks
- Late design changes
- Additional factory work is
costly and causes delays
- Early involvement of supplier is vital
- Additional factory work is
costly and causes delays
- Loss of factory production slot
- Finding a new slot can cause
major delays
- Caused by
- Underestimating lead in
times
- Drifting start dates
- Underestimating lead in
times
- Effective
communication of key
- Finding a new slot can cause
major delays
- Suppliers failing to
deliver on time
- Construction is stopped, other
processes cannot proceed
- Therefore increase in time and
money
- Therefore increase in time and
money
- Effective supply chain
managementrequired
- Ensure orders places in
plenty of time
- Ensure orders places in
plenty of time
- Construction is stopped, other
processes cannot proceed
- Late design changes
- Different risks
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