Sitework takeoff
Clearing, over-excavation, structural fill and haul-off quantities for Willamette silt and clay subgrades.
CY · SF · TONCorvallis, OR
Construction estimating services in Corvallis, OR
We produce quantity takeoffs and construction estimates for Corvallis contractors, developers and owners. Deliverables arrive in Excel and PDF, organized by CSI MasterFormat division, with marked-up plan sets, typically within 24 to 48 hours.
24–48 hours for most projectsTypical turnaround
Every CSI divisionSitework through MEP
Corvallis ZIP pricingLocal material and labor
Price confirmed firstBefore any work starts
Census BPS · Corvallis · 2025Real permit data
Corvallis new housing permits2025
New housing units401Change vs. 2024+383%Permitted construction value$79MAverage value per unit$197,300Rank among covered Oregon cities#7
Single-family: 26 (6%)Multifamily: 375 (94%)
U.S. Census Bureau, Building Permits Survey, 2025. Residential only.
What makes construction estimating in Corvallis different?
Corvallis pricing turns on four local drivers: Willamette silt and clay subgrades that drive over-excavation and structural fill quantities, wet-season excavation and dewatering, a multifamily-heavy permit mix that puts repetition and unit-mix math at the center of bids, and Benton County permitting and inspection sequencing.
- Corvallis permitted 401 new housing units in 2025, #7 among the Oregon cities we cover.
- About 94% were in multifamily buildings; 6% were single-family.
- Permit volume was up 383% compared with 2024.
Corvallis sits in Benton County on the Willamette River, with Oregon State University anchoring the north side of town and US-20 and OR-99W carrying most material and crew traffic. Residential permitting here is dominated by attached housing: of the 401 new privately-owned residential units permitted in 2025, 375 were multifamily, roughly 94 percent. That mix changes how a bid is built. You are not pricing one house; you are pricing a unit mix, a repeatable floor plan, and the sitework that serves it.
We take off from your plan set, apply ZIP-code-adjusted material and labor pricing, and return a CSI MasterFormat estimate in Excel and PDF with marked-up drawings. For builders working across the valley, our Oregon construction estimating work covers the same scopes we price in Corvallis, and crews bidding down I-5 in Albany or Springfield get the same format so estimates can be compared line for line. If you are pricing a multifamily package, start with Multi-Family Estimating Services.
- Coverage
- Corvallis and nearby Oregon communities
- Deliverable
- Excel estimate + marked-up PDF plans
- Pricing basis
- Corvallis ZIP-code material and labor costs
- Turnaround
- 24–48 hours for most projects
- Software
- Bluebeam Revu, PlanSwift, RSMeans data
01
For bidders. You need a defensible number before the bid date. We take off concrete, framing, MEP and sitework from your set, flag scope gaps, and return a CSI-divided estimate you can mark up and submit.
02
For builders. You are buying out trades and sequencing around Willamette Valley rain. We give you quantities by division and by unit type so purchase orders and change orders start from the same baseline.
03
For owners. You are comparing proposals and checking a budget. We provide an independent quantity takeoff and marked-up plan set so you can see what each bidder did and did not include.
Corvallis by the numbers
Corvallis's residential construction pipeline
Select a bar to compare Corvallis with the largest Oregon markets we cover.
401New housing units, 2025
4.3%Of all units in the Oregon cities we cover
$79MPermitted residential value
94%In multifamily buildings
New housing units permitted in 2025. Source: U.S. Census Bureau, Building Permits Survey.
This city
Corvallis
401 new housing units in 2025 (+383.1% vs 2024).
26 single-family · 375 multifamily (94%).
Permit volume shifted hard toward attached housing
Corvallis issued 401 new privately-owned residential units in 2025, up from 83 in 2024, a 383 percent increase. Single-family accounted for just 26 units; multifamily accounted for 375, about 94 percent of the total. Permitted value was $79M, an average of $197,300 per unit. For a bidder, that average is a warning: unit counts alone do not size a job. A 375-unit multifamily total spread across several projects means concrete, framing and MEP quantities repeat, and the estimate has to be built from a typical unit plus a count of atypical units rather than a single lump sum. Statewide, Corvallis ranked 7th of 25 covered cities by units and took 4.3 percent of the 9,431 units permitted across those cities. See how we handle the rest of the state on our Oregon estimating page.
Sitework and foundations carry the local risk
Willamette Valley subgrades in and around Corvallis commonly run to silt and soft clay, and winter water tables rise with the rain season. That shows up in the estimate as over-excavation depth, imported structural fill, geotextile, footing drain and sump quantities, and dewatering allowances that a dry-summer market would not carry. On the flat ground west toward Philomath and along the river corridors, you also price haul-off and sometimes shoring. Because these items are driven by a geotechnical report rather than the architectural set, they are the first place a low bid goes wrong. Our Sitework Estimating Services and Foundation Estimating Services scopes exist to put those quantities on paper before you commit a number.
Services
Construction estimating services in Corvallis
We price the scopes that show up on Corvallis plan sets, from sitework through MEP rough-in, and deliver them by CSI MasterFormat division.
Concrete estimating
Footings, slab-on-grade, podium decks and retaining walls priced with ready-mix and formwork by pour.
CY · SF · LFFoundation estimating
Spread footings, stem walls, waterproofing and footing drains sized to the geotechnical report.
CY · LF · SFFraming estimating
Wood-frame multifamily and light commercial walls, floors and trusses taken off by unit type.
LF · EA · BFMEP estimating
Plumbing, HVAC and electrical rough-in quantities for repetitive unit plans and common areas.
LF · EA · TONRoofing estimating
Low-slope membrane and steep-slope assemblies with underlayment, flashing and edge metal.
SF · LF · SQMultifamily estimating
Full-building takeoffs built from a typical unit plus a count of atypical units and amenities.
SF · EA · UNITIndustrial estimating
Warehouse, lab and light-manufacturing scopes, including slab flatness and process utility runs.
SF · LF · CYWho we provide estimates for
Who we estimate for in Corvallis
Multifamily developers
Corvallis permitted 375 multifamily units in 2025, 94% of all new residential units. We take off by unit type so your per-door cost and buyout packages hold up across the whole building.
General contractors
You are bidding OSU-area infill and Willamette Valley housing against local subs. We give you CSI-divided quantities and a marked-up set so your scope letter answers every bidder question.
Framing and concrete subcontractors
Corvallis work runs on tight sites and wet-season schedules. We quantify formwork, rebar, and stud counts by floor so your crew hours and material orders match the drawings.
Architects and design teams
You need a cost check before the set is final. Our takeoff flags missing scope in wall assemblies and MEP risers while changes are still cheap to make.
Owners and property managers
You are comparing contractor proposals for a Corvallis renovation or new building. An independent quantity takeoff shows what each bidder included and what was left out.
Institutional and campus-adjacent builders
Work near Oregon State University and downtown carries staging and access limits. We price the site logistics and phasing that a plain plan takeoff misses.
Where we provide estimates
Corvallis areas and nearby communities we cover
We estimate projects across Benton County and the mid-Willamette Valley, from central Corvallis to the surrounding towns along I-5 and OR-99W. If your project is in one of these areas, send the plan set and we will price it.
Central Corvallis
- Downtown Corvallis
- Oregon State University area
- College Hill
- South Corvallis
- North Corvallis
Corvallis edges and west side
- Philomath
- Witham Hill
- Timberhill
- Willamette Riverfront
Nearby Willamette Valley cities
Property types
Types of Corvallis properties we estimate
Corvallis permitting in 2025 was almost entirely multifamily, with 375 of 401 new privately-owned residential units in buildings of two or more units. That said, the city also has a steady stream of single-family infill, student rentals, and campus-area commercial work.
Multifamily apartments
Three- and four-story wood-frame buildings with tuck-under or podium parking are common near campus and along transit corridors. We take off by unit type, then roll up common area, corridor, and amenity space separately.
Watch for: Unit-mix repetition, fire-rated assemblies, and MEP riser counts.
Townhomes and rowhouses
Attached units on narrow infill lots drive party-wall detailing and separate utility runs. We quantify each unit's framing, sheathing, and finishes so your purchase orders match the unit count.
Watch for: Party-wall fire separation and per-unit utility stubs.
Single-family infill
Only 26 single-family units were permitted in Corvallis in 2025, so each one is a custom bid. We price full sitework, foundation, framing, and finishes from your architectural and structural sheets.
Watch for: Tight-lot excavation, shoring, and utility tie-in distances.
Student rentals and conversions
Older houses near Oregon State University are frequently converted to room-by-room rentals. We take off the added bathrooms, separate entries, and egress windows that conversions require.
Watch for: Egress, sound separation, and added plumbing fixture counts.
Commercial and mixed-use
Downtown and along major corridors, ground-floor retail with apartments above is a common format. We split the estimate by use so the shell, core, and tenant improvement scopes stay separate.
Watch for: Shell versus TI split and ADA path-of-travel scope.
Institutional and campus buildings
Laboratories, classrooms, and support buildings near the university carry dense MEP and specialty systems. We quantify mechanical, electrical, and plumbing runs by system and by floor.
Watch for: Lab gas, exhaust, and controls scope gaps.
Local factors
What changes a construction estimate in Corvallis
A Corvallis estimate is not the same as one for Portland or Bend. Local code adoption, Willamette Valley soils, wet-season scheduling, and the university-driven labor market all move the number.
Code edition and permitting
Oregon adopts statewide building codes, but the City of Corvallis handles its own plan review and inspections, and the adopted edition can lag or lead what you used on your last job. Seismic, energy, and fire-separation requirements for wood-frame multifamily are the most common sources of added cost. Confirm the current adopted code edition and any local amendments with the Corvallis building department before you finalize your bid.
Oregon Building Codes Division · City of Corvallis Community Development · IBC · IECCSoils and foundation design
Much of Corvallis sits on Willamette Valley alluvium, with pockets of soft silt and clay near the river and older fill in developed areas. Geotechnical reports often call for over-excavation, structural fill, or deeper footings than a standard prescriptive design. We price foundation scope from the geotech recommendations and structural sheets, not from a default detail.
Geotechnical report · Structural drawings · Foundation Estimating ServicesRain and winter scheduling
Corvallis gets most of its rain between October and May, which affects excavation, concrete placement, and exterior finishes. A bid that assumes dry-season productivity will underprice the work. We build in temporary erosion control, dewatering, and weather-day assumptions so your schedule and cost line up.
Erosion control plan · Dewatering · Winter concrete protectionLabor market and prevailing wages
Corvallis is a smaller labor market than Portland, and crews often travel from Albany, Salem, or Eugene. That travel time shows up in labor rates and per-diem. Projects using federal or state funding may carry prevailing wage requirements, which change the labor component of every division. We apply ZIP-code-adjusted labor and flag when a wage determination is likely.
Prevailing wage determination · Crew travel · RSMeans dataSite access and stormwater rules
Infill lots near downtown and campus are tight, with limited staging and no room for large equipment. The city also enforces stormwater and erosion requirements that add sitework scope. We quantify temporary access, spoils haul-off, and stormwater controls as separate line items so they are not buried in general conditions.
Stormwater permit · Erosion control · Sitework Estimating ServicesMaterial logistics and lead times
Corvallis is off the I-5 mainline, so most material comes through Albany or Salem. That adds freight and can add days to delivery windows for structural steel, switchgear, and specialty finishes. We note long-lead items in the estimate and separate freight where the supplier quotes it, so your buyout reflects the real delivered cost.
Freight · Long-lead items · Albany supply routeCorvallis estimating guide
How Corvallis conditions show up in a takeoff, trade by trade
Corvallis sits in Benton County, where wet winters, Willamette Valley soils, and a heavy multifamily pipeline shape what estimators must quantify. The five sections below cover the trades where local conditions most often change line items, units, or waste factors.
Sitework and utilities
Corvallis gets roughly 50 inches of rain a year, most between October and May, so your sitework takeoff needs more than cut and fill. Quantity topsoil strip by square yard and account for haul-off because valley soils are often high in clay and silt. Trenching for sanitary sewer and storm lines runs deeper than in drier parts of Oregon, and dewatering may be required if you hit the winter water table. Under the city's stormwater rules, you may need to size flow-control and water-quality facilities; confirm the current manual with the local building department. On a recent Corvallis project, we saw 1,200 LF of 8-inch PVC sewer and 900 LF of 12-inch storm line. Use our sitework estimating services to price these items with ZIP-adjusted labor.
Framing and wood structures
Most Corvallis low-rise multifamily and residential projects use wood framing. Your takeoff should separate floor joists, wall studs, headers, and roof trusses. Studs are counted by length and spacing: a 2x6 wall at 16 inches on center uses about 1.2 studs per square foot of wall area. Sheathing is taken off by sheet count, with 5–10% waste for cuts and damage. Roof trusses are often engineered and priced per unit. With Oregon's seismic design categories, you will also need to quantify hold-downs, anchor bolts, and shear panels. Framing estimating services can turn your plans into a stud-by-stud material list.
MEP systems
Mechanical, electrical, and plumbing rough-in is where Corvallis projects often see the biggest cost swings. For a 40-unit apartment building, you might take off 40 kitchen exhaust fans, 40 bathroom exhaust fans, and 40 water heaters. Plumbing fixture counts drive the number of wet walls and vent stacks. Electrical takeoff includes devices, fixtures, and panelboards by amperage. Because Oregon adopts new energy codes regularly, confirm the current edition with the local building department; it affects insulation, glazing, and HVAC sizing. MEP estimating services can give you a full division 22–26 takeoff with quantities and units.
Concrete and foundations
The Willamette Valley's expansive clay soils drive foundation design. A geotechnical report will tell you whether you need over-excavation and replacement, deeper footings, or a post-tensioned slab. For a typical Corvallis multifamily building, we take off continuous footings by linear foot, stem walls by square foot of face area, and slab-on-grade by square foot. Rebar is quantified by bar size and total length, then converted to tons. Formwork is measured by contact area. Because of the wet climate, you may need to include curing compound and protection. Concrete estimating services can help you price these items with local material costs and waste factors.
Roofing and envelope
Corvallis roofs take a beating from rain and moss. Asphalt shingles are common, but you should take off underlayment by square (100 square feet), ice-and-water shield at eaves and valleys by linear foot, and ridge vent by linear foot. For low-slope multifamily, TPO or EPDM membrane is measured by square foot with 10% waste for seams and flashing. Roofing estimating services can price both steep- and low-slope systems. Don't forget drip edge, valley metal, and pipe boots. On a 20,000-square-foot roof, you might have 200 squares of shingles, 300 LF of ridge cap, and 400 LF of drip edge.
Scope gaps we see on Corvallis bids
- Dewatering and erosion control are left out of sitework bids, then added as change orders when winter rains hit.
- Over-excavation and soil replacement for expansive clays are not shown on structural drawings, so bidders miss them.
- Stormwater flow-control and water-quality facilities are omitted because the civil plans reference a separate manual.
- Seismic hold-downs and shear panel nailing schedules are not counted in framing takeoffs, leading to underbids.
- Roof underlayment and ice-and-water shield at valleys are skipped when bidders price only shingles per square.
- MEP rough-in allowances are carried as lump sums instead of counts, so fixture and device quantities are never verified.
Free tool
Concrete volume calculator
Quick check for a single element. For a full drawing set, send the plans and we measure everything, including the items calculators miss.
Typical waste: 3–5% for slabs, 5–10% for footings and walls. Truck count assumes 10 CY loads; confirm load size with your ready-mix supplier.
Result
19.4CY
Net volume18.5 CY
Cubic feet500 CF
Ready-mix trucks (10 CY)2
80 lb bags (premix)875
Need the full takeoff with pricing? Upload your plans.
How it works
How we estimate a Corvallis project
- Read the full setArchitectural, structural, civil and MEP drawings, the geotechnical report and every addendum.
- Check Corvallis conditionsLocal code edition, site and drainage requirements, soils and any hazard rules are confirmed before the takeoff starts.
- Take off by CSI sectionQuantities measured and color-coded on the plans, so every number traces to a sheet.
- Price to CorvallisMaterial and labor costs adjusted to the project ZIP code, or to your own supplier quotes and crew rates.
- Check and deliverA second estimator checks quantities before the estimate goes out.
Sample output
Sample takeoff: Corvallis 40-unit wood-framed apartment building
| Section | Line item | Qty | Unit |
|---|---|---|---|
| 03 30 00 | Slab-on-grade concrete, 5 in. | 16,800 | SF |
| 03 30 00 | Continuous footings, 24 in. x 12 in. | 620 | LF |
| 05 10 00 | Structural steel columns and beams | 4.2 | tons |
| 06 10 00 | 2x6 wood studs, 16 in. O.C. | 4,800 | LF |
| 06 10 00 | Wood floor trusses, 24 in. O.C. | 13,200 | SF |
| 07 30 00 | Asphalt shingles, 30-year | 220 | squares |
| 22 10 00 | Plumbing fixtures (water closets, lavatories, tubs) | 120 | EA |
| 26 20 00 | Electrical devices (receptacles, switches) | 560 | EA |
Worked example: slab-on-grade concrete for a Corvallis 40-unit apartment building
We will take off a 5-inch slab-on-grade for a 40-unit, three-story wood-framed apartment building in Corvallis. The building footprint is 120 feet by 40 feet. All dimensions are illustrative.
First, calculate the area: 120 ft × 40 ft = 4,800 SF. Because the building has three floors, the slab-on-grade covers only the ground floor, so the area remains 4,800 SF. However, we must add for thickened edges under bearing walls and at the perimeter. Assume a 12-inch-wide by 12-inch-deep thickened edge runs along the perimeter and under two interior bearing walls. Perimeter = 2 × (120 + 40) = 320 LF. Interior bearing walls total 160 LF. Total thickened edge length = 480 LF.
Convert thickened edge to cubic yards: 480 LF × 1 ft width × 1 ft depth = 480 CF. Divide by 27 to get 17.78 CY. For the slab: 4,800 SF × (5/12) ft = 2,000 CF. Divide by 27 to get 74.07 CY. Total concrete = 17.78 + 74.07 = 91.85 CY. Add 5% waste for spillage and uneven subgrade: 91.85 × 1.05 = 96.44 CY. Round up to 97 CY.
Next, reinforcement. Assume #4 rebar at 16 inches on center each way. For the slab: area = 4,800 SF. Number of bars in one direction: 120 ft / (16/12) ft = 120 / 1.333 = 90 bars. Each bar is 40 ft long, so total length = 90 × 40 = 3,600 LF. In the other direction: 40 ft / 1.333 = 30 bars, each 120 ft long, total = 30 × 120 = 3,600 LF. Total slab rebar = 7,200 LF. For thickened edges, assume 4 continuous #4 bars: 480 LF × 4 = 1,920 LF. Total rebar = 7,200 + 1,920 = 9,120 LF. Add 10% for laps and waste: 9,120 × 1.10 = 10,032 LF. Convert to tons: #4 rebar weighs 0.668 lb/ft, so 10,032 × 0.668 = 6,701 lb = 3.35 tons.
Finally, formwork for thickened edges: measure contact area. The edge forms are 1 ft high on both sides of the thickened edge, so 480 LF × 2 sides × 1 ft = 960 SF of formwork. Add 10% waste: 1,056 SF.
These quantities feed directly into our concrete estimating services and foundation estimating services. For a full takeoff on your Corvallis project, send us your plans.
FAQ
Corvallis construction estimating questions
What does your Corvallis construction estimating service include?
We provide full quantity takeoffs and cost estimates organized by CSI MasterFormat division. You receive Excel and PDF files with marked-up plan sets. Our pricing uses ZIP-code-adjusted material and labor data from RSMeans. We cover all trades, from sitework to MEP, and can break out quantities by unit, floor, or building. Turnaround is 24–48 hours for most projects, with rush options available. Use our get an estimate page to upload your plans.
How do I get a quote for my Corvallis project?
Send us your plans and specifications through our get an estimate page. We will review the documents and provide a fixed price and delivery date. For most Corvallis projects, we can return a quote within a few hours. If you have a bid deadline, tell us and we will confirm whether we can meet it. We work with general contractors, subcontractors, developers, architects, and owners.
What types of projects do you estimate in Corvallis?
We estimate residential, commercial, industrial, and multi-family projects. In Corvallis, we see a mix of wood-framed apartments, student housing, and smaller commercial buildings. Because the city issued 401 new residential units in 2025, with 94% multifamily, many of our takeoffs are for apartment and condo buildings. We also handle renovations, tenant improvements, and single-family custom homes. Our multi-family estimating services and commercial estimating services are well suited to Corvallis work.
Do you use local Corvallis labor and material prices?
Yes. Our estimates are based on ZIP-code-adjusted material and labor pricing. We use RSMeans data and adjust for the Corvallis market, including Benton County labor rates and local supplier costs. This means your estimate reflects what you will actually pay for concrete, lumber, and trades in the Willamette Valley. We also factor in typical waste factors and local conditions like wet weather and soil types.
How long does it take to get an estimate for a Corvallis project?
Most estimates are delivered within 24–48 hours after we receive complete plans. Larger or more complex projects may take longer, and we will tell you upfront. Rush service is available if you have a tight bid deadline. We deliver Excel and PDF files, organized by CSI MasterFormat division, with marked-up plan sets so you can see exactly what we measured.
What information do you need to start a takeoff?
We need architectural, structural, civil, and MEP drawings, plus specifications and any addenda. A geotechnical report is helpful for foundation takeoffs. If you have a bid form or scope sheet, send that too. The more complete the documents, the more accurate the estimate. We can work from PDFs or native files. If something is missing, we will note assumptions in the estimate.
Do you account for Oregon's seismic and energy codes?
Yes. Oregon adopts the International Building Code and International Residential Code with state amendments, and energy codes affect insulation, glazing, and HVAC. Seismic design categories in the Willamette Valley require hold-downs, shear panels, and specific nailing. We include these items in our takeoffs where the drawings show them. Always confirm the adopted code edition with the local building department, because it changes every few years.
Can you estimate both new construction and renovations in Corvallis?
Yes. We estimate new construction, additions, and renovations. For renovations, we separate demolition from new work and quantify both. That helps you price dumpsters, haul-off, and disposal fees. We also handle phased projects, where part of the building stays occupied. If you have existing drawings and a scope narrative, we can work from those. Send your plans to get started.
What is the source of the Corvallis permit data you cite?
The permit numbers on this page come from the U.S. Census Bureau, Building Permits Survey for 2025. They count new privately-owned residential units permitted by the city itself. In 2025, Corvallis issued permits for 401 units, up from 83 in 2024. That is a 383% increase. The permitted value was $79 million, with an average of $197,300 per unit. These figures cover residential only, not commercial or industrial permits.
Do you serve other cities near Corvallis?
Yes. We provide construction estimating services throughout Oregon, including Albany, Springfield, Bend, Medford, Tigard, and Lake Oswego. If your project is in Benton County or the Willamette Valley, we can help. Our Oregon construction estimating page covers the state, and you can also visit the pages for each city. Turnaround and deliverables are the same regardless of location.
Other Oregon cities we cover
Popular services in Corvallis
Send your Corvallis project plans for a quote
Upload your drawings and specifications through our get an estimate page, and we will return a fixed price and delivery date within hours.
- We review the set and check for missing sheets or addenda.
- You get a quote with a price and a delivery date.
- You approve and we start the takeoff.
- You receive the Excel estimate and marked-up plans.