Oakridge Custom Residence
A two-story desert contemporary residence with a detached casita, four-car garage, infinity-edge pool and extensive outdoor living space on a sloped hillside lot. The custom home builder needed a detailed cost-plus estimate the owners could sign off on, with every allowance documented and the hillside foundation fully quantified.
Location
Scottsdale, AZ
Size
6,800 SF, 2 stories
Estimated value
$3.6M
Estimate turnaround
72 hours
Scope estimated
What we measured and priced
- 1,100 CY of hillside cut with 2,400 SF of shotcrete retaining walls and 48 soil nails
- 410 CY of concrete in stepped footings, stem walls and post-tensioned slab with 28 tons of rebar
- 84,000 board feet of framing lumber, 8,400 SF of roof sheathing and 38 engineered steel moment frames and beams
- 7,400 SF of flat foam roofing with 1,200 SF of standing-seam metal accents
- 62 aluminum-clad windows and 14 multi-slide door panels totaling 2,100 SF of glazing
- 6,200 SF of three-coat stucco and 2,600 SF of stacked stone veneer
- Custom millwork in 7 rooms including a 28 LF kitchen island, 3 vanities and a wine room
- 7 zones of HVAC totaling 21 tons, 6.5 bathrooms with 42 plumbing fixtures and 310 light fixtures with a lighting control system
- Infinity-edge pool and spa with 1,800 SF of travertine decking and 3,400 SF of landscape and irrigation
The estimating challenge
The owners wanted a signed cost-plus budget before breaking ground, but the lot sloped 22 feet across the building footprint and the structural set left retaining wall heights and soil nail counts to be field-verified. Glazing made up a quarter of the exterior wall area and included multi-slide doors with long lead times and pricing that depended on finish selections not yet made. The builder had been burned on a prior job where allowances were set too low, so every finish, fixture and appliance allowance needed a documented basis.
The result
LEEDS built a cross-section of the site at each gridline to quantify the retaining walls and shotcrete, carried soil nails at the geotechnical recommendation with a unit price for additions, and priced the glazing package against two manufacturer quotes at the mid-range finish. Allowances for tile, plumbing fixtures, appliances and lighting were set from the designer's preliminary selections with a written basis for each. We delivered in 72 hours and the owners signed the $3.6M budget without revision. The home closed out about 2.6% over budget, almost entirely from owner-elected upgrades rather than estimating gaps.
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