Value engineering estimating prices the cost-reduction alternates that come up when a bid or GMP number is over budget. You send the plans, specs, and the current estimate; we take off each alternate at the same location and return a line-by-line delta with the scope consequence attached. This is not a percentage haircut — it is a priced comparison of assemblies, materials, and systems so you can defend each option to a lender, owner, or design team. We organize the takeoff by CSI MasterFormat division and deliver Excel and PDF with marked-up plan sets. Most projects turn around in 24–48 hours.
- Deliverable
- Excel estimate + marked-up PDF plans
- Organized by
- CSI MasterFormat section
- Turnaround
- 24–48 hours for most projects
- Pricing
- ZIP-code-adjusted material and labor pricing
- Software
- Bluebeam Revu, PlanSwift, RSMeans data
Typical VE alternates land in Division 03 Concrete, Division 05 Metals, Division 07 Thermal & Moisture, Division 08 Openings, Division 09 Finishes, Division 22 Plumbing, Division 23 HVAC, and Division 26 Electrical. For example, we measure a 5 in. slab on grade versus 4 in. slab in square feet, then convert to cubic yards using the thickness difference and apply a waste factor; we count #4 reinforcing at 12 in. on center versus welded wire fabric by the square foot of slab area; we compare CMU back-up to metal stud back-up at exterior walls by wall area from floor to deck; we price TPO 60-mil versus 45-mil membrane by the square (100 SF) with flashing and edge metal as linear feet; and we count aluminum windows versus storefront by each, with frame perimeter for sealant and flashing. Each alternate is checked against the applicable code family — IECC for insulation and glazing, IBC for fire ratings, NEC for lighting and wiring, IPC for pipe materials — and we flag when a downgrade triggers a re-check by the engineer of record.
For a broader look at how we handle full estimates, see our construction estimating services. If your VE scope includes site utilities or structural steel, we also provide material takeoff services and labor cost estimating services to back up the deltas. When a VE alternate changes the schedule, we can tie the delta to a change order estimating review, and for projects still in preconstruction we build the same alternates into a budget estimating services model so the comparison carries through bid day.
What our value engineering cost estimating covers
We price each alternate as a standalone scope item, then compare it to the baseline. The output is a delta table by division, with quantities, unit costs, and the code or performance impact noted. We do not guess at savings percentages; every number ties to a measured quantity and a ZIP-code-adjusted unit cost.
Slab and Reinforcement
Measure slab thickness changes and reinforcement substitutions, then price concrete volume and steel weight.
CY · SF · LBStructural Framing
Compare structural steel versus open-web joists, including connections and fireproofing, by ton and linear foot.
TON · LF · EAExterior Wall Assemblies
Evaluate CMU back-up versus metal stud back-up, including insulation and finishes, by wall area.
SF · LF · EARoofing Systems
Price membrane substitutions (TPO, EPDM, mod-bit) with insulation R-value changes and flashing lengths.
SQ · LF · EAOpenings and Glazing
Compare window and storefront types, frame finishes, and glazing U-factor/SHGC, counting each and perimeter.
EA · SF · LFInterior Partitions and Finishes
Price partition type changes (shaftwall vs. Type X) and flooring or ceiling substitutions by area.
SF · LF · EAPlumbing and HVAC
Evaluate pipe material changes (copper to PEX/CPVC) and HVAC efficiency tiers with ductwork substitutions.
LF · EA · TONElectrical and Sitework
Compare lighting fixture packages and sitework alternates like asphalt section or storm pipe material.
EA · LF · SYWhat every value engineering estimating takeoff includes
- Slab thickness and reinforcement changes (5 in. to 4 in., #4 at 12 in. O.C. to WWF)
- Structural steel vs open-web joist and joist girder framing
- CMU back-up vs metal stud back-up at exterior walls
- Roof assembly substitution (TPO 60-mil to 45-mil, EPDM, mod-bit) with R-value change
- Window and storefront glazing type, frame finish, U-factor/SHGC change
- Interior partition type (1-hr shaftwall vs 5/8 in. Type X each side)
- Flooring substitution (LVT to VCT, carpet tile backing and face weight)
- Acoustical ceiling panel and grid (NRC, CAC, tegular vs lay-in)
- Plumbing pipe material (copper Type L to PEX or CPVC) and fitting counts
- HVAC equipment efficiency tier and duct material (galvanized to spiral or flex)
- Lighting fixture package (LED wattage, lumen output, controls, occupancy sensors)
- Site work alternates (asphalt section, curb type, storm pipe RCP vs HDPE)
How we price VE alternates and build the cost model
- Baseline reconciliationWe start from your current estimate or bid. Each line is mapped to the CSI division and spec section so the alternate is compared at the same location. If the baseline is a lump sum, we back into quantities from the drawings. For example, a $2.5M bid with a lump-sum concrete package is broken into slab area, wall area, and footing counts using the structural sheets. This step prevents double-counting savings that are already in the number and ensures the delta reflects the true scope change.
- Alternate takeoffFor each VE option, we measure the quantity from the plans — slab area, wall area, roof squares, pipe LF, fixture EA — and apply the correct waste factor. For example, a 4 in. slab vs 5 in. slab is measured in SF, then converted to CY with the thickness difference. We note the drawing sheet and detail number for each measurement, such as S-101 for slab thickness or A-501 for window types. Waste factors are applied per material: typically 5% for concrete, 10% for tile, and 7% for ductwork. This ensures the alternate quantity is directly comparable to the baseline.
- Unit cost build-upWe price material and labor separately using ZIP-code-adjusted RSMeans data, then add equipment and subcontractor markup where applicable. For a roof membrane swap, we price the membrane, insulation, adhesive, and labor per square, plus flashing and edge metal. For a plumbing change from copper to PEX, we build up pipe cost per LF, fitting counts, hanger spacing, and fire-stopping requirements. The result is a unit cost delta you can apply to the quantity, with each component visible so you can adjust assumptions or negotiate with suppliers.
- Code and performance checkEach alternate is checked against the applicable code family: IECC for insulation and glazing, IBC for fire ratings, NEC for lighting and wiring, IPC for pipe materials. We flag when a downgrade triggers a re-check by the engineer of record. For example, reducing roof insulation from R-30 to R-20 may fail the adopted IECC edition and require a compensating upgrade in glazing U-factor. We also verify UL assembly numbers for fire-rated partitions and check that lighting wattage meets the NEC and energy code. This is where most VE lists fail — the savings disappear when the code impact is priced.
- Delta table and narrativeWe deliver a table with baseline cost, alternate cost, delta, and scope consequence for every option. The narrative explains what is gained or lost: schedule float, maintenance cycle, warranty term. For instance, switching from structural steel to open-web joists may save material cost but add two weeks to the schedule due to fabrication lead times. We quantify the general conditions impact per day and show the net effect. You get a defensible document to present to the owner or lender, not a list of percentages.
- Review and finalizeWe review the delta table with you, answer questions, and adjust any assumptions. If you need additional alternates or a deeper dive into a specific division, we can provide that. For example, if the owner wants to explore a different HVAC efficiency tier, we can price the equipment, controls, and duct modifications. The final package is delivered in Excel and PDF, ready for your presentation, with marked-up plan sets showing each VE location.
What we need to start
- Current estimateYour bid or GMP breakdown by division, so we can compare alternates to the same baseline.
- Plans and specsArchitectural, structural, MEP, and civil drawings, plus the specification book with section numbers.
- VE listAny alternates already suggested by the design team or owner, so we price those first.
- Code editionThe adopted IBC, IECC, NEC, and IPC editions for the jurisdiction, to check performance impacts.
- Project scheduleMilestone dates and long-lead items, so we can price schedule float gained or lost.
- Basis of designDesign criteria for structural loads, MEP capacities, and acoustical ratings, to avoid under-design.
Sample VE delta table
This is the format we use to compare baseline and alternate costs. Quantities are illustrative for a mid-size commercial project.
| Section | Line item | Qty | Unit | Ref. |
|---|---|---|---|---|
| 03 30 00 | Cast-in-place slab, 5 in. vs 4 in. | 18,400 | SF | S-101 |
| 05 12 00 | Structural steel vs open-web joists | 42 | TON | S-201 |
| 07 41 00 | TPO 60-mil vs 45-mil membrane | 22,000 | SF | A-301 |
| 08 51 13 | Aluminum windows vs storefront | 48 | EA | A-501 |
| 09 21 16 | 1-hr shaftwall vs 5/8 in. Type X | 3,250 | SF | A-601 |
| 22 11 16 | Copper Type L vs PEX piping | 1,200 | LF | P-101 |
| 23 31 00 | Galvanized vs spiral duct | 4,800 | LB | M-201 |
| 26 51 00 | LED fixture package, 30% wattage reduction | 320 | EA | E-301 |
| 03 30 00 | Concrete slab: 4 in. vs 5 in. thickness | 18,400 | SF | S-101 |
| 05 12 00 | Steel joists vs structural steel | 42 | TON | S-201 |
| 07 41 00 | TPO membrane: 45-mil vs 60-mil | 22,000 | SF | A-301 |
| 08 51 13 | Storefront vs aluminum windows | 48 | EA | A-501 |
Units of measure we take off for VE
Each VE alternate is measured in the unit that matches how it is bought and installed. This keeps the delta comparable to the baseline.
| Item | Unit | How it's measured |
|---|---|---|
| Slab on grade | SF | Area measured at the inside face of exterior walls, with thickened edges separate. |
| Structural steel | TON | Weight from member sizes and lengths, including connection plates and bolts. |
| Roof membrane | SQ | Roof area in squares (100 SF), with perimeter and penetration flashing as LF. |
| Windows | EA | Count by type and size, with frame perimeter for sealant and flashing. |
| Partitions | SF | Wall area from floor to deck, deducting openings over 10 SF. |
| Ductwork | LB | Pounds of galvanized or spiral duct from gauge and surface area. |
| Pipe | LF | Centerline length by material and size, with fittings counted separately. |
| Lighting | EA | Fixture count by type, with controls and wiring as separate line items. |
Worked example: pricing a roof membrane and insulation VE alternate
This is a step-by-step takeoff of one VE alternate: swapping a 60-mil TPO roof with R-30 insulation for a 45-mil TPO with R-20 insulation on a 22,000 SF roof. Dimensions are illustrative.
Step 1 — Roof area. The roof plan shows a rectangular building 200 ft by 110 ft. Gross area = 200 × 110 = 22,000 SF. Deduct two 4 ft × 8 ft skylight curbs (64 SF) and one 10 ft × 10 ft mechanical curb (100 SF) = 22,000 − 164 = 21,836 SF net membrane area.
Step 2 — Convert to squares. Membrane is bought by the square (100 SF). 21,836 ÷ 100 = 218.36 squares. Round to 219 squares for ordering.
Step 3 — Insulation. Same area as membrane: 21,836 SF. R-30 polyiso at 5.5 in. thick vs R-20 at 3.5 in. thick. Insulation is also sold by the square. 218.36 squares each.
Step 4 — Flashing and edge metal. Perimeter = 2 × (200 + 110) = 620 LF. Add 10% for corners and terminations = 682 LF. Edge metal is 682 LF. Pipe boots: count 14 vent pipes. Skylight curbs: 2 × (4 + 8 + 4 + 8) = 48 LF. Mechanical curb: 10 × 4 = 40 LF. Total flashing = 682 + 48 + 40 = 770 LF.
Step 5 — Fasteners and adhesive. Insulation fasteners: 1 per 2 SF for R-30, 1 per 2.5 SF for R-20. R-30: 21,836 ÷ 2 = 10,918 fasteners. R-20: 21,836 ÷ 2.5 = 8,734 fasteners. Membrane adhesive: 1 gallon per 100 SF for 60-mil, 1 gallon per 120 SF for 45-mil. 60-mil: 219 gallons. 45-mil: 182 gallons.
Step 6 — Waste factor. Apply waste as a separate line. Membrane waste: typically 7% for TPO. Insulation waste: typically 5%. Fasteners: 3%. Adhesive: 5%. 60-mil membrane: 219 × 1.07 = 234 squares. 45-mil: 219 × 1.07 = 234 squares. R-30 insulation: 219 × 1.05 = 230 squares. R-20: 219 × 1.05 = 230 squares. Fasteners R-30: 10,918 × 1.03 = 11,246. R-20: 8,734 × 1.03 = 8,996. Adhesive 60-mil: 219 × 1.05 = 230 gallons. 45-mil: 182 × 1.05 = 191 gallons.
Step 7 — Unit cost build-up. Use ZIP-code-adjusted RSMeans data. Material and labor priced separately. For this example, assume 60-mil TPO material $1.10/SF, labor $0.90/SF. 45-mil: material $0.85/SF, labor $0.90/SF. R-30 insulation: material $2.20/SF, labor $0.80/SF. R-20: material $1.60/SF, labor $0.80/SF. Edge metal: $8.50/LF material, $6.00/LF labor. Fasteners: $0.12 each material, $0.05 each labor. Adhesive: $25/gallon material, $10/gallon labor.
Step 8 — Delta calculation. Baseline (60-mil + R-30) vs alternate (45-mil + R-20). Membrane material savings: (1.10 − 0.85) × 21,836 = $5,459. Insulation material savings: (2.20 − 1.60) × 21,836 = $13,102. Fastener material savings: (0.12 × 10,918) − (0.12 × 8,734) = $262. Adhesive material savings: (25 × 219) − (25 × 182) = $925. Labor savings: fasteners and adhesive only: (0.05 × 10,918) − (0.05 × 8,734) = $109; (10 × 219) − (10 × 182) = $370. Total material and labor savings before code check = $5,459 + $13,102 + $262 + $925 + $109 + $370 = $20,227. Then add code impact: reducing R-30 to R-20 may fail IECC; if a compensating glazing upgrade is required, add that cost. This is where the net savings can shrink or disappear.
What drives value engineering cost reduction
Relative impact on a typical estimate for this trade, based on estimator judgment. Select a bar for details.
Material substitution
Swapping copper pipe for PEX reduces material cost but may require different hangers, fire-stopping, and labor rates. The delta is not just the pipe price; it includes fittings, insulation, and testing. For instance, copper Type L uses soldered fittings and requires fire-stopping at penetrations, while PEX uses crimp fittings and may need fire-rated wraps. We build up the full installed cost for each option.
Reducing slab thickness from 5 in. to 4 in. cuts concrete volume by 20%, but may require closer joint spacing or additional reinforcement. The net delta depends on the reinforcement change and the subgrade conditions. For example, a 5 in. slab with #4 at 12 in. O.C. versus a 4 in. slab with WWF changes both concrete and steel quantities. We price each layer separately to show the true net savings.
Swapping copper pipe for PEX reduces material cost but may require different hangers, fire-stopping, and labor rates. The delta is not just the pipe price; it includes fittings, insulation, and testing. For instance, copper Type L uses soldered fittings and requires fire-stopping at penetrations, while PEX uses crimp fittings and may need fire-rated wraps. We build up the full installed cost for each option.
Downgrading roof insulation from R-30 to R-20 may fail IECC. The cost of the alternate must include the energy code re-check and any required compensating measures, such as increased glazing performance. For example, if the roof R-value is reduced, the energy model may require a higher U-factor for windows, which could cost more than the roof savings. We flag these trade-offs.
A long-lead alternate can save material cost but delay the schedule. General conditions, hoisting, and temporary facilities carry daily costs. We price the float gained or lost as a separate line. For instance, switching from structural steel to open-web joists might save $50,000 in material but add two weeks to the schedule due to fabrication lead times. At $5,000 per day in general conditions, that is a $70,000 cost, erasing the savings.
Lower-cost flooring or roofing may have a shorter replacement cycle. Over a 10-year hold, the owner's cost can be higher. We note the expected service life and replacement cost in the narrative. For example, VCT may cost less than LVT initially, but requires stripping and waxing every year, while LVT needs only damp mopping. We compare the present value of maintenance over the hold period.
Some materials install faster than others, changing labor hours. For example, PEX piping installs faster than copper, reducing labor cost per LF. We use RSMeans labor rates adjusted for ZIP code and apply productivity factors based on material and site conditions. The delta table shows the labor savings separately from material savings, so you can see where the money comes from.
Different materials have different waste factors. For example, tile waste is typically 10-15%, while carpet waste is 5-10%. When substituting materials, the waste factor changes, affecting the total quantity needed. We apply the appropriate waste factor to each alternate and show it as a separate line in the takeoff. This prevents underestimating the required purchase quantity.
Common scope gaps we catch in a VE analysis
Most VE lists miss the hidden costs that erase savings. We check each alternate against these common gaps.
- R-value and U-factor impact when insulation or glazing is downgraded — the energy code re-check often requires a compensating upgrade elsewhere. This hides in the energy compliance path, and we catch it by running a quick check against the adopted IECC edition.
- Fire-resistance rating loss when a partition or deck assembly is changed — the UL design number must be re-verified, and the alternate may need additional layers. This hides in the UL directory, and we catch it by checking the assembly number against the proposed change.
- Structural re-engineering fees and permit re-submittal time for framing or slab changes — these are hard costs that belong in the delta. They hide in the engineer's proposal, and we catch them by requiring a fee quote as part of the VE package.
- MEP load recalculation when equipment efficiency or duct material changes — the engineer's fee and any resizing of ducts or piping must be included. This hides in the mechanical engineer's scope, and we catch it by flagging any change that affects load calculations.
- Acoustic performance loss (STC/IIC) when flooring or wall assemblies change — this can trigger a change order from the owner if the spec requires a rating. It hides in the acoustical consultant's report, and we catch it by comparing the proposed assembly to the specified STC/IIC.
- Maintenance and replacement cycle cost over the owner's hold period — we compare first cost to life-cycle cost for the alternate. This hides in the O&M manuals, and we catch it by using published service life data and applying a present value factor.
- Schedule float gained or lost, and the general conditions dollars tied to it — a two-week delay can cost more than the material savings. This hides in the project schedule, and we catch it by pricing general conditions per day and multiplying by the float change.
- Long-lead substitution risk when a specified product is swapped for an alternate — availability and lead time must be verified. This hides in the procurement log, and we catch it by checking current lead times with suppliers or using published data.
- Freight, storage, and handling differences between substituted materials — these can add 5–10% to the installed cost. This hides in the supplier quotes, and we catch it by adding a line item for freight and handling based on material type and distance.
- Warranty term and manufacturer certification differences — a shorter warranty may be unacceptable to the owner. This hides in the warranty documents, and we catch it by comparing the warranty terms of the baseline and alternate products.
- Sales tax and local availability of the alternate product — not all alternates are stocked locally. This hides in the supplier database, and we catch it by checking local availability and applying the correct sales tax rate for the ZIP code.
- Scope transferred to another trade when an assembly is re-split (e.g., casework to millwork) — the delta must include the new trade's markup. This hides in the subcontractor breakdown, and we catch it by reallocating the scope and applying the appropriate markup.
Assembly-level substitutions we price
Each row compares a baseline assembly to a common VE alternate at the same location, with the unit cost delta and the performance consequence noted.
| Baseline assembly | VE alternate | Unit of measure | Performance consequence to check |
|---|---|---|---|
| 5 in. slab on grade with #4 @ 12 in. O.C. | 4 in. slab with WWF | SF / CY | Joint spacing, reinforcement, subgrade bearing |
| Structural steel frame | Open-web joists and joist girders | TON | Fabrication lead time, camber, vibration |
| CMU back-up at exterior walls | Metal stud back-up | SF | Fire rating, thermal bridging, moisture management |
| TPO 60-mil membrane with R-30 insulation | TPO 45-mil with R-20 insulation | SQ | IECC compliance, hail rating, warranty term |
| Aluminum windows with low-E glazing | Storefront with standard glazing | EA | U-factor, SHGC, structural wind load |
| 1-hr shaftwall partition | 5/8 in. Type X each side | SF | UL assembly number, STC rating |
| LVT flooring | VCT flooring | SF | Maintenance cycle, IIC rating, adhesive VOC |
| Copper Type L piping | PEX or CPVC piping | LF | Fire-stopping, hanger spacing, fitting count |
| Galvanized ductwork | Spiral or flex duct | LB | Pressure class, leakage, insulation |
| LED fixtures with 30% wattage reduction | Standard LED package | EA | Lumen output, controls, NEC load |
| Asphalt section with 3 in. base | 2 in. base with thicker surface | SF | Traffic loading, subgrade, drainage |
| RCP storm pipe | HDPE storm pipe | LF | Bedding, joint type, cover depth |
Codes and standards that affect VE takeoffs
Model codes
VE alternates must be checked against the adopted model codes. IECC governs insulation R-values and glazing U-factors; reducing roof insulation may require a compensating upgrade. IBC controls fire-resistance ratings and means of egress; changing a partition assembly can void the UL design number. NEC sets lighting wattage and wiring methods; a fixture swap must meet load and control requirements. IPC and UPC govern pipe materials and fittings; switching from copper to PEX requires checking fire-stopping and support spacing. NFPA 13 affects sprinkler head placement if ceiling type changes. Confirm the adopted editions with the local building department.
Industry standards
Estimators rely on standards that define how materials are measured and installed. ACI 302 and ACI 318 govern concrete slab and reinforcement design; reducing slab thickness changes joint spacing and reinforcement per ACI. ASTM standards cover material properties: ASTM D6878 for TPO, ASTM C1289 for polyiso, ASTM A653 for steel. SMACNA duct construction standards set gauge and reinforcement; switching to spiral or flex duct changes leakage class. GA-216 covers gypsum board application; partition substitutions must meet GA requirements. NRCA roof manual provides installation details for membrane and flashing. These standards are referenced in the specs.
Specification sections
Read the specification sections that govern each alternate. Division 03 30 00 (cast-in-place concrete) states slab thickness, reinforcement, and finish; a VE alternate must comply or trigger a re-submittal. Division 05 12 00 (structural steel) and 05 21 00 (joist framing) define member sizes and connections. Division 07 41 00 (roof assemblies) lists membrane thickness, insulation R-value, and flashing details. Division 08 51 13 (aluminum windows) specifies glazing type, frame finish, and performance. Division 09 21 16 (gypsum board) and 09 51 00 (acoustical ceilings) define partition and ceiling assemblies. Division 22 11 16 (plumbing pipe) and 23 31 00 (ductwork) set material and installation requirements. Division 26 51 00 (lighting) lists fixture types and controls. Each section may include submittal requirements and warranties that change cost.
Local amendments
Adopted code editions and amendments vary by jurisdiction. Some states adopt the IECC with amendments that change R-value requirements or glazing limits. Local fire codes may add requirements for fire-rated assemblies. Energy codes in California (Title 24) and New York (NYC Energy Code) are more stringent than the model IECC. Some jurisdictions require a separate permit for structural changes, adding fees and review time. Always confirm the adopted code edition and any local amendments with the local building department before pricing a VE alternate. This step prevents a code violation that could erase the savings.
Who uses our value engineering estimates
General contractors
You need priced alternates to bring a bid within budget without giving away margin. Our delta table lets you present options to the owner and defend the savings.
Owners and developers
You want to know the cost and performance trade-offs before approving a change. We show the life-cycle impact, not just first cost.
Architects
You need to maintain design intent while hitting a budget. Our estimates flag code and acoustic impacts so you can adjust the specification correctly.
Subcontractors
You are asked to provide VE options for your scope. We price them with the same unit costs you use, so you can submit a credible proposal.
Construction managers
You manage the GMP and need to track savings. Our line-item deltas feed directly into your cost report and change order log.