MIL-HDBK-1191
1.9.1 Levels Of Facility Alteration. Categorize and estimate all costs
associated with projects containing altered areas including the cost of
temporary structures, if required, according to the following definitions
1.9.1.1 Level 1 - Light alteration includes minor partition layout
changes, new finish treatment, minor casework and equipment changes,
minor modifications to Heating, Ventilation and Air Conditioning (HVAC)
distribution systems, and minor electrical branch circuit changes. The
estimated cost of this alteration should not exceed 30 percent of
replacement cost for the same type of facility.
1.9.1.2 Level 2 - Medium alteration includes Level 1 changes, minor-to-
major partition layout changes with associated modifications to the HVAC
distribution systems and electrical power and light requirements, minor
structural modifications, new plumbing fixtures, allowances for roof
repair, and changes in mechanical system insulation when asbestos is
present. The estimated cost of this alteration should not exceed 50
percent of replacement cost for the same type of facility.
1.9.1.3 Level 3 - Heavy alteration includes Level 1 and 2 changes,
gutting of the building to structural frame without demolishing floors,
exterior walls and roof assembly, modifications to structural frame, main
electrical distribution system, air handling units and auxiliary
equipment, plumbing system, and energy plant. The estimated cost of this
alteration should not exceed 75 percent of replacement cost for the same
type of facility.
1.9.1.4 Proposed alteration projects with a cost exceeding the 75
percent of replacement cost must be considered for a total replacement of
the facility unless other restrictions make it an infeasible option.
1.9.2 Interim Facilities. The cost of interim facilities (temporary
construction), if required, shall be included in the estimated cost for
each of the above levels of alteration.
1.9.3 Site Investigation. Designers shall conduct thorough
investigations of existing facilities to be upgraded or modified, in
accordance with the conditions of their design contracts, to become
knowledgeable of facility conditions. This includes the need to inspect
concealed spaces (above-ceiling areas, chases, and equipment rooms, for
example), to permit evaluation and accurate depiction of as-built
conditions. Design agents are responsible to assure that the scope of
work for each design contract describes this designer responsibility.
Generally, designers should be required to directly inspect all equipment
rooms and all above-ceiling areas in enough locations as to reasonably
establish the existing conditions in all major areas and departments, and
on each floor, of a given project facility. In facilities with "hard"
ceilings, this may require the creation of inspection openings, and the
need to establish in the Scope of Work the responsibility for making and
repairing these openings. The design team must recognize the economic
advantages of a detailed designer site investigation: if the designers do
not verify conditions, the construction contractor must do so, normally
at a cost premium reflected in higher bidding costs (unknown conditions)
and change orders (changed conditions).
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