Siding is an exterior envelope assembly, not just square feet of lap board. When you send plans for a vinyl, fiber cement, or metal panel job, we take off the cladding, the weather-resistive barrier behind it, the flashing at every penetration, the trim coil that closes the edges, and the access equipment that gets crews to the third floor. That is the difference between a bid that holds and a change order in month two.
- 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
We organize every siding takeoff by CSI MasterFormat Division 07, with related Division 06 rough carpentry and Division 05 cold-formed framing broken out where furring or sub-girts carry the cladding. You get Excel and PDF files, marked-up plan sets showing exactly where each quantity came from, and a clear list of assumptions so your bid carries no silent scope. Material and labor pricing is ZIP-code adjusted, so a vinyl siding estimate in Texas does not carry the same labor rate as one in California.
As an outsourced siding estimating company, we work from your bid documents and return a line-item estimate you can drop into your bid form. Our siding estimator logs each wall by elevation, counts corner trim, soffit and fascia runs, and board and batten spacing, then prices the siding labor takeoff separately from material so you can adjust either side. If your scope also includes waterproofing or insulation, we can price those under the same Thermal & Moisture Protection umbrella so the envelope numbers reconcile.
Most projects turn around in 24–48 hours. Rush service is available when bid day is close. We use Bluebeam Revu, PlanSwift, and RSMeans data, and we flag where a fiber cement product must meet ASTM C1186 or where shake siding and soffit details change the waste factor. If you need a siding estimate for contractors who bid public work, we can also note OSHA access requirements that affect scaffold and lift pricing. Send your plans through the Get an estimate page to start.
What our siding quantity takeoff covers
We measure net wall elevation by elevation, deduct openings, then add back the trim and flashing that openings create. Cladding, WRB, continuous insulation, trim, fasteners, sealants, and access equipment are separate line items. Tear-off and disposal are included when the scope is a re-side. Metal panel jobs get clip counts and sub-girt layouts, not just panel SF.
Vinyl Siding Takeoff
Measure lap siding, starter strip, J-channel, corner posts, and soffit by elevation, with waste factors applied.
SF · LF · EAFiber Cement Estimating
Count fiber cement panels or planks, trim boards, and touch-up materials, including cut allowances for gables.
SF · LF · EAMetal Panel Systems
Take off concealed clip or exposed fastener panels, sub-girts, and perimeter closures for rainscreen assemblies.
SF · LF · EAWeather Barrier Takeoff
Measure house wrap or fluid-applied WRB in SF or rolls, including lap and seam tape quantities.
SF · ROLL · LFFlashing & Trim
Count head, sill, jamb, pan flashing, drip cap, and Z-flashing at roof-wall intersections.
LF · EAContinuous Insulation
Price rigid foam or mineral wool thickness and R-value by wall area, with fasteners and washers.
SF · EAFurring & Sub-Girts
Estimate hat channel, Z-furring, or sub-girts for rainscreen and panel attachment, including shims.
LF · EAAccess & Equipment
Determine scaffold, pump jack, or swing stage needs by elevation and project duration.
SF · MOWhat every siding estimating takeoff includes
- Net and gross wall area by elevation, with opening deductions
- Vinyl, fiber cement, or metal panel count by product and exposure
- Weather-resistant barrier in SF or rolls, with lap allowance
- Continuous exterior insulation thickness and R-value by area
- Corner boards, J-channel, starter strip, and utility trim in LF
- Window and door head, sill, jamb, and pan flashing in LF/EA
- Drip cap and Z-flashing at roof-wall intersections in LF
- Furring, hat channel, or sub-girts for rainscreen and metal panel
- Fasteners by type: ring-shank nails, screws, or concealed clips
- Caulk, sealant, and backer rod at joints and penetrations
- Vents, utility blocks, and penetration boots in EA
- Scaffold, pump jacks, or swing stage by elevation and duration
How we build a siding material takeoff
- Set the wall baselineWe open the architectural elevations and wall sections and establish the finish grade line, plate heights, and roof-wall intersections. Each elevation is measured as a separate polygon so gable ends, dormers, and bay windows are captured as their own areas. We record gross wall area first, then deduct openings.
- Deduct and add back openingsWindows and doors are deducted by rough opening, not by frame size. We then add back the trim, jamb flashing, and pan flashing each opening creates, because those are linear feet that a pure SF deduction hides. A 3 ft x 5 ft window removes 15 SF of cladding but adds roughly 16 LF of head, sill, and jamb trim.
- Layer the envelopeBehind the cladding we measure WRB, continuous insulation, and any air barrier separately. If the spec calls for a rainscreen, we add furring or hat channel at 16 in or 24 in on center and adjust fastener length for the added depth. This is where most sub quotes bury scope.
- Build the trim scheduleCorner boards, J-channel, starter strip, utility trim, frieze, fascia, and soffit are measured in LF from the elevations. We check the wall sections for trim depth and corner board width, since continuous insulation changes both. Color-matched caulk and touch-up allowances are listed as material lines.
- Price access and wasteTwo- and three-story elevations get scaffold, pump jack, or swing stage priced by face area and duration. Waste factors are applied by product and geometry: vinyl lap runs lower than fiber cement shingle on a cut-up gable. Metal panel waste depends on module width and where the panel breaks land.
- Verify attachment and fastenersWe read the attachment schedule and wall section to confirm fastener type, length, and spacing. Ring-shank nails for vinyl, screws for fiber cement, and concealed clips for metal panel each carry different counts per SF and per clip. We convert counts to boxes or pails for pricing and flag any pull-out or corrosion requirements.
- Reconcile with other tradesWe cross-check our takeoff against the roofing, waterproofing, and insulation scopes to ensure flashing terminations and transitions are not double-counted or omitted. For example, we confirm that roof-wall flashing is not already in the roofing estimate. The final deliverable includes a note on coordination points.
What to send us
- ElevationsAll four sides, with material tags and finish notes. These drive the wall area and trim takeoff.
- Wall sectionsShows WRB, insulation, furring, and cladding buildup. Without it we cannot price the layers behind the siding.
- Floor and roof plansUsed to check plate heights, roof-wall intersections, and where flashing runs terminate.
- Window and door scheduleRough opening sizes let us deduct and add back accurately instead of guessing from elevation symbols.
- SpecificationsDivision 07 sections name the product, thickness, and attachment method. We price to the spec, not to a generic assembly.
- Bid form or scope sheetIf the GC has a required line item format, we map our takeoff to it so nothing is left to interpret.
Sample takeoff format
This is how a two-story fiber cement re-side appears in our Excel deliverable. Quantities are illustrative and drawn from the elevation set.
| Section | Line item | Qty | Unit | Ref. |
|---|---|---|---|---|
| 07 46 33 | Fiber cement lap siding, 5/16 in, primed | 18,400 | SF | A-201 |
| 07 25 00 | Weather barrier, Grade D housewrap, 10% lap | 19,320 | SF | A-301 |
| 07 21 00 | Continuous insulation, 1 in XPS, R-5 | 17,200 | SF | A-301 |
| 07 62 00 | Z-flashing at roof-wall intersection, 26 ga | 420 | LF | A-202 |
| 07 46 33 | Corner board, 4 in, fiber cement | 1,240 | LF | A-201 |
| 07 90 00 | Sealant, color-matched, at trim and penetrations | 96 | EA | A-501 |
| 05 40 00 | Hat channel, 7/8 in, at 16 in o.c., rainscreen | 4,100 | LF | A-301 |
| 07 46 33 | Starter strip, vinyl, at wall base | 860 | LF | A-201 |
| 07 46 33 | J-channel, vinyl, at openings and soffit | 2,150 | LF | A-201 |
| 07 92 00 | Joint sealant, polyurethane, at dissimilar materials | 48 | EA | A-501 |
| 07 25 00 | Housewrap tape, 3 in wide, at seams and penetrations | 1,200 | LF | A-301 |
| 06 10 00 | Wood furring, 1x3, at 16 in o.c., for siding attachment | 3,800 | LF | A-301 |
Units of measure we use
Siding quantities are meaningless without the unit behind them. Here is how each line is measured and where it comes from on the drawings.
| Item | Unit | How it's measured |
|---|---|---|
| Wall cladding | SF | Net elevation area minus openings, plus a waste factor for gables and dormers |
| Weather barrier | SF | Gross wall area plus 10% for laps and terminations at openings |
| Trim and flashing | LF | Scaled from elevations and wall sections, measured along the installed centerline |
| Vents and blocks | EA | Counted from elevation and plan views at each penetration |
| Subcontractor pricing | SQ | 100 SF of wall area, used where a sub bids by the square |
| Access equipment | SF | Elevation face area reached by scaffold, pump jack, or swing stage |
| Fasteners | EA | Counted per clip or per nail pattern from the attachment schedule; converted to boxes for pricing |
| Sealant and caulk | EA | Tubes counted from joint length and penetration count; 10 LF per tube typical for 1/4 in bead |
| Corner boards | LF | Measured along outside and inside corners from plan and elevation views |
| Starter strip | LF | Measured along wall base and at horizontal transitions; includes overlap allowance |
| J-channel | LF | Measured around openings and at soffit and frieze terminations |
| Housewrap tape | LF | Measured along seams and at penetrations; typically 3 in wide |
Worked example: fiber cement lap siding on one gable elevation
This example walks through a single gable-end elevation. The dimensions are illustrative and chosen to show every step. Your actual takeoff will measure each elevation separately.
Elevation dimensions
- Wall base width: 24 ft
- Wall height at eaves: 10 ft
- Gable peak height above eave: 6 ft
- Window: 3 ft x 5 ft, one unit
- Door: 3 ft x 7 ft, one unit
Step 1: Gross wall area
- Rectangular area: 24 ft × 10 ft = 240 SF
- Gable triangle area: (24 ft × 6 ft) ÷ 2 = 72 SF
- Gross wall area = 240 + 72 = 312 SF
Step 2: Deduct openings
- Window area: 3 ft × 5 ft = 15 SF
- Door area: 3 ft × 7 ft = 21 SF
- Total openings = 36 SF
- Net wall area = 312 − 36 = 276 SF
Step 3: Add waste factor
- Fiber cement lap on a cut-up gable: typical waste 10–12%. Use 10%.
- Waste area = 276 SF × 0.10 = 27.6 SF
- Cladding order quantity = 276 + 27.6 = 303.6 SF → round to 304 SF
Step 4: Weather barrier
- Gross wall area = 312 SF
- Add 10% for laps and terminations = 31.2 SF
- WRB quantity = 312 + 31.2 = 343.2 SF → 344 SF
Step 5: Trim and flashing
- Corner boards: 2 outside corners × 10 ft = 20 LF
- J-channel at window: 2 × (3 ft + 5 ft) = 16 LF
- J-channel at door: 2 × (3 ft + 7 ft) = 20 LF
- Starter strip at base: 24 LF
- Head flashing at window: 3 LF
- Sill flashing at window: 3 LF
- Head flashing at door: 3 LF
- Total trim and flashing LF = 20 + 16 + 20 + 24 + 3 + 3 + 3 = 89 LF
Step 6: Fasteners
- Fiber cement lap: 2 nails per lap, 8 in o.c. along studs.
- Studs at 16 in o.c.: 24 ft ÷ 1.33 ft = 18 studs (round up)
- Courses: 10 ft eave height ÷ 6 in exposure = 20 courses; gable adds ~6 courses at center.
- Nails per stud per course: 2; total nails ≈ 18 studs × 26 courses × 2 = 936 nails.
- Add 10% for waste = 1,030 nails. Convert to boxes: 1,030 ÷ 350 per box ≈ 3 boxes.
Step 7: Sealant
- Joint length at trim and penetrations: ~60 LF.
- 1/4 in bead: 10 LF per tube typical.
- Tubes = 60 ÷ 10 = 6 tubes.
Step 8: Access
- Single-story gable: pump jacks or ladders. Scaffold not required.
- If two-story, add scaffold by face area: 24 ft × 20 ft = 480 SF.
This is the level of detail we return for every elevation. Waste is a separate line so you can adjust it. Flashing is measured, not assumed. Fasteners are counted from the attachment schedule. When you send us a plan set, we produce this for every wall on the job.
What moves a siding cost estimating number
Relative impact on a typical estimate for this trade, based on estimator judgment. Select a bar for details.
Product type
Vinyl lap is the lowest material and labor cost per SF. Fiber cement runs higher on both, and metal panel adds clip and sub-girt labor. The spread between the cheapest and most expensive cladding on the same wall area is often 2x or more installed.
Vinyl lap is the lowest material and labor cost per SF. Fiber cement runs higher on both, and metal panel adds clip and sub-girt labor. The spread between the cheapest and most expensive cladding on the same wall area is often 2x or more installed.
A simple rectangular elevation wastes 5–8% on lap siding. A cut-up elevation with gables, dormers, and bay windows can push waste to 12–15% and adds trim LF at every inside and outside corner. Geometry, not square footage, drives the trim and waste lines.
WRB, continuous insulation, and rainscreen furring are separate scopes that change trim depth, corner board width, and fastener length. A spec with 2 in of exterior polyiso and hat channel costs materially more than one with housewrap against the sheathing.
Single-story walls can be run off ladders and pump jacks. Two- and three-story elevations require scaffold or a swing stage, priced by face area and how long the crew needs it. Access can be 5–15% of the installed siding cost on tall, narrow elevations.
A re-side adds removal of existing cladding, underlayment, and nails, plus dumpster count and disposal fees. Hidden sheathing damage is the most common change order on re-side work, so we carry a repair allowance and flag it as an assumption.
Siding labor rates vary by ZIP code and by whether the crew is union or open shop. We price labor from ZIP-adjusted data so a bid in a high-cost metro does not carry rural wage assumptions. Sales tax on materials is applied by project location.
Specified fasteners change cost: stainless steel screws for cedar or treated substrates, ring-shank nails for vinyl, and concealed clips for metal panel each carry different unit prices and counts per SF. We price from the attachment schedule, not a default.
Head, sill, jamb, pan, and kick-out flashing at every opening and roof-wall intersection add linear feet and labor. A wall with many penetrations or a complex roof line can double the flashing LF compared to a simple elevation.
Scope gaps we catch during siding bid preparation
Most siding bids fail on the items that hide between the cladding and the sheathing. These are the ones we see repeatedly.
- WRB and flashing buried in the siding SF price. Subs often quote one number per square that silently includes or excludes the barrier. We break it out as its own line so you can see what is covered.
- Opening deductions without add-backs. A takeoff that deducts windows by frame size and never adds jamb flashing or pan flashing undercounts trim and leaves a leak detail unpriced. We deduct by rough opening and add the flashing back.
- Continuous insulation thickness changing trim depth. When the spec adds 1–2 in of exterior foam, corner boards get wider and fasteners get longer. If the takeoff uses the base trim schedule, the material order comes up short.
- Starter strip and utility trim quoted as included but never measured. These are real linear feet at every wall base and opening. We measure them from the elevations and list them separately.
- Metal panel clip and sub-girt system priced as panel SF only. The concealed clip count, hat channel, and attachment to structure are separate labor and material. We take them off from the wall section and panel layout.
- Scaffold and access left to the GC. On two- and three-story elevations the access cost is significant and often assumed to be someone else's line. We price it by face area and duration and state the assumption.
- Housewrap tape and seam sealing omitted. WRB laps and penetrations require tape or liquid sealant; a takeoff that lists only the wrap SF misses the tape LF and sealant tubes. We measure tape along seams and at every penetration.
- Fastener corrosion and compatibility not specified. Using electroplated screws with cedar or treated wood can cause corrosion and callbacks. We check the spec for stainless or hot-dip galvanized and price accordingly.
- Clearance and termination details at grade and roof. Siding must terminate 6–8 in above grade and 1–2 in above roof surfaces; missing these details leads to rot and change orders. We include starter strip and kick-out flashing where required.
- Vapor retarder and air barrier continuity not coordinated. If the WRB is also the air barrier, seams and penetrations must be sealed; otherwise the energy code compliance may be at risk. We flag the continuity requirement and price sealant and tape.
- Fire separation and rated assemblies not addressed. Party walls and zero-lot-line conditions may require fire-rated cladding or additional sheathing. We note where the assembly must meet a fire-resistance rating and price the specified materials.
- Color matching and touch-up allowances not carried. Factory-finished siding may require touch-up paint and extra material for color consistency. We include a touch-up allowance as a material line to avoid a surprise.
Siding materials compared on the estimating axis
Material and labor vary by product. This table compares the three main cladding families on the factors that change your estimate.
| Product | Typical material cost per SF | Installed labor hours per SF | Waste factor range | Trim and fastener notes |
|---|---|---|---|---|
| Vinyl lap | Low | 0.02–0.04 | 5–8% | J-channel, starter strip, corner posts; ring-shank nails; no painting. |
| Insulated vinyl | Low–medium | 0.03–0.05 | 5–8% | Same trim as vinyl; thicker profile may require wider corner posts. |
| Fiber cement lap | Medium | 0.04–0.07 | 8–12% | Blind nailing or screws; corner boards and trim often fiber cement; factory finish. |
| Fiber cement shingle | Medium | 0.06–0.10 | 10–15% | Individual shingles increase labor; more fasteners; complex gables raise waste. |
| Metal panel (aluminum) | Medium–high | 0.05–0.09 | 8–12% | Concealed clips; sub-girts; expansion joints; sealant and gaskets. |
| Metal panel (steel) | Medium–high | 0.05–0.09 | 8–12% | Similar to aluminum; heavier panels may require more clips; corrosion protection. |
| ACM panel | High | 0.07–0.12 | 10–15% | Rout-and-return or tray system; stiffeners; sealant joints; careful layout. |
Codes and standards that affect siding takeoffs
Model codes
The International Building Code (IBC) and International Residential Code (IRC) govern siding installation, weather protection, and fire performance. Chapter 14 of the IBC and Chapter 7 of the IRC cover exterior wall coverings, including clearance from grade, flashing, and attachment. The International Energy Conservation Code (IECC) sets continuous insulation R-values that change cladding thickness and trim depth. The National Electrical Code (NEC) affects mounting blocks and penetration sealing. Confirm the adopted editions with your local building department.
Industry standards
ASTM standards for fiber cement (C1186), vinyl (D3679), and metal panels (E330, E331) define product performance and test methods. The American Wood Council's Wood Frame Construction Manual provides fastener schedules for wood substrates. SMACNA guidelines cover metal panel installation and thermal movement. Manufacturer installation instructions are code-referenced and often more restrictive than the model code; always price to the manufacturer's requirements.
Specification sections
Division 07 sections that change cost include 07 25 00 Weather Barriers (type, thickness, seam treatment), 07 21 00 Thermal Insulation (continuous insulation thickness and R-value), 07 46 00 Siding (product, profile, attachment), 07 62 00 Sheet Metal Flashing and Trim (gauge, finish, length), and 07 90 00 Joint Protection (sealant type, joint width). Division 06 10 00 Rough Carpentry covers sheathing and furring; Division 05 40 00 Cold-Formed Metal Framing covers hat channel and sub-girts. Read the full section for submittals and warranties.
Local amendments
Adopted code editions and amendments vary by state and jurisdiction. Some areas require specific wind-uplift ratings, wildfire-resistant cladding, or enhanced energy codes. Local amendments may add continuous insulation requirements or restrict certain materials. Always confirm the adopted code edition and any local amendments with the local building department before finalizing your estimate. We price to the code and spec you provide, but we flag where local amendments may change quantities.
Who uses this siding estimate for contractors
General contractors
You need a defensible number to compare against sub quotes and to carry in your bid. Our line-item breakdown shows where a low quote is missing WRB, flashing, or access, so you can level the bids before you commit.
Siding subcontractors
You bid several jobs a week and cannot take off every one in detail. We return a measured takeoff with trim and fastener counts you can price directly, which shortens your bid cycle and reduces the risk of a missed line.
Developers and owners
You are comparing cladding options across a portfolio or checking a change order. Our estimates separate material, labor, and access so you can see the cost of upgrading from vinyl to fiber cement or adding a rainscreen.
Architects
You specify the assembly and need a cost check before the bid set is finalized. We price the wall section as drawn, including WRB, insulation, and furring, so you can see the cost impact of a detail change early.