Roofing Estimating Services
Roofing material, labor and quantity takeoffs measured from your actual roof plans — squares, sheets, flashings, penetrations and accessories priced so your bid holds up through award.
- Why Roofing Needs Real Measurement
- What a Roofing Estimate Includes
- Systems We Estimate
- Roofing Numbers That Matter
- How the Takeoff Is Prepared
- Sample Takeoff Excerpt
- Waste & Penetration Notes
- FAQ
Why Roofing Estimates Need Real Measurement
A roofing estimate lives or dies on the difference between the field you measure and the scope you actually install. The field area of a roof deck is only the starting point. Every hip and valley adds waste, every parapet adds flashing, every penetration adds curbs and bases, and every accessory line item — ridge vents, snow guards, gutters, counterflashings — adds material that a square-foot price can never capture. Roofing contractors who price by the drawing rather than by the ballpark square footage consistently walk away from bid day with both a margin and a scope defense.
The roofing industry prices work in squares, where one square equals 100 square feet of installed roof surface. A 10,000 square foot building footprint rarely means a 100-square estimate, because roof slope, overhangs, fascia and dormer or parapet geometry all expand the number of squares on the sloped surface. An estimator who multiplies building footprint by a flat square-foot number is building error into the bid before the first shingle is priced. Measuring the true sloped surface, then layering the flashings and accessories on top, is how a roofing quantity takeoff becomes a number your crews can install to.
At CEDS Estimating, every roof takeoff starts from the plans and elevations in your drawing set and is organized the way a roof installs: deck preparation first, then underlayment, then the field system, then the flashings and penetrations, then the accessories that most generic square-foot estimates ignore. The result is a quantity that matches the scope of work you will actually buy and install, not a study of what a roof "might" cost.
What a Roofing Estimate Includes
A complete roofing estimate is a stack of related quantities, not a single field-area number. Each component below is measured, grouped and priced so your team can buy out the job line by line. If a detail is not shown on the drawings, it is written down as an assumption rather than silently guessed.
- Deck Preparation
- Existing deck condition assumptions, tear-off of old systems, IRMA or adhered-over-deck layers, fastener length and substrate repairs that the roofing scope must absorb before the new membrane goes down.
- Underlayment
- Synthetic underlayment or felt squares, ice-and-water shield at eaves and valleys, vapor barriers and cover boards for low-slope assemblies, each measured in squares or sheets with laps included.
- Roof System
- The primary installed system — shingles, metal panels, TPO, EPDM, PVC or coating — measured as true sloped surface area in squares, including field sheets, trim and seam allowances for reinforced membranes.
- Flashings
- Parapet, wall, base and counter flashings, drip edges, copings, gravel stops, edge metal and rake trim — always counted in linear feet and fully priced, because flashing is where roofing bids leak money.
- Penetrations
- Pipe boots, curbs, vents, skylights, exhaust stacks, roof drains and scuppers counted individually, with the collar, base flashing and counterflashing each penetration requires.
- Accessories
- Ridge and hip caps, snow guards, roof hatches, gutters and downspouts, walkway pads, termination bars, sealants and fasteners — the line items that turn a competitive bid into a profitable project.
Every one of these quantities is carried separately in the estimate rather than blended into a single square-foot rate. That structure is what lets you compare your installed costs against the estimate after the job is done, and it is what lets a change order be priced from one clean line instead of reworking the whole sheet.
Roofing Systems We Measure and Price
Each roofing family has its own measurement logic. Sloped shingle roofs are measured on the sloped surface with waste scaled to the roof's hip, valley and eave complexity. Low-slope systems are quantified in adhered or ballasted field sheets with flashings broken out separately. The grid below shows the systems CEDS estimates every week and the specifics that matter in each takeoff.
Steep-Slope Shingles
Asphalt architectural shingles in squares, with starter course, hip and ridge cap exposure rates, valley flashing lengths, ice-and-water shield and waste allowances scaled to your roof's break-up.
Low-Slope & TPO / EPDM
Single-ply membrane quantified in field sheets and flashings, with mechanically attached, adhered or ballasted rows, seam counts, termination bars and parapet and curb detail assemblies fully itemized.
Metal Roofing
Standing seam and exposed fastener panels measured in panels, feet and SF, with clips, purlin and seam counts, flashings, ridge and valley panels, and the full trim schedule that metal bids always underestimate.
Single-Ply Membranes
PVC and TPO systems priced as complete assemblies — cover board, insulation thickness and R-value, membrane, seaming tape, fasteners and plates per row — not just a membrane square-foot price.
Coatings & Restoration
Roof coating and restoration scopes measured in SF by coating coat, with substrate prep, seam treatment, primer, granular embedment on cap coats and the base-flashing work that restorations almost always add.
Accessories & Warranties
Ridge vents, snow guards, hatches, ladders, gutters, scuppers, through-wall flashings, termination bars and the warranty paperwork and material submittals that belong in a complete roofing scope.
When a project is a re-roof over an existing system, the takeoff also separates removal quantities — tear-off squares, disposal, exposed-deck repairs and the fastener redundancy analysis that a second roof system demands. That removal scope is priced as its own section so the bid does not bury demolition inside new construction.
How a Roofing Takeoff Is Prepared
A roofing quantity takeoff follows a fixed sequence so nothing gets measured twice and nothing gets skipped. The order below is the same sequence CEDS uses on every residential re-roof and every 50,000 square foot commercial deck.
- 1
Roof Plan Review
The roof plan, elevations and sections are read first. The estimator confirms roof geometry — slopes, hips, valleys, parapets, dormers — and checks whether the documents are a design intent drawing or a construction set ready to measure.
- 2
Sections by System
The roof is divided into field sections by system and slope. Sloped surfaces are measured on the true sloping surface, not the plan projection, and each section is logged in square feet and converted to squares.
- 3
Flashing & Trim Counts
Eaves, rakes, valleys, ridges, parapets, copings, gravel stops and drip edges are measured in linear feet. Curbs, outlets and skylights are counted individually with their flashing detail noted from the drawing.
- 4
Accessories & Penetrations
Every accessory is tallied — roof drains, scuppers, vents, snow guards, hatches, gutters, downspouts and walkway pads. Quantities are matched against the roof plan's callouts so schedule and plan agree.
- 5
Waste & Net-to-Gross
Waste factors are applied by system and roof complexity, then net areas become gross order quantities so your material order, not just your takeoff, is bid-ready.
A Sample Roofing Takeoff Excerpt
This excerpt shows how a small section of a low-slope roof takeoff reads when it arrives — the field system separated from flashings and penetrations so every quantity is traceable and buyable. Figures are illustrative sample data for a single area of a commercial roof.
| Section | Component | Quantity | Unit | Takeoff Note |
|---|---|---|---|---|
| A-1 | TPO field membrane, 60-mil adhered | 38.6 | SQ / 100 SF | 3,860 SF sloped field, sheets scheduled at 10 ft width |
| A-1 | Metal coping, 24 in | 214 | LF | Parapet perimeter both walls of area A-1 |
| A-1 | Parapet base & counterflashing | 214 | LF | Base flashing 8 in, counterflashing 6 in, termination bar set |
| A-1 | Scupper insert with overflow | 6 | EA | Thru-wall scuppers with metal drip collar, per 2 on each parapet run |
| Total field membrane area before waste & penetrations — 3,860 SF / 38.6 sq | ||||
The excerpt is illustrative only. Your takeoff uses your own project's roof plan geometry, membrane type and flashing details.
Steep vs. Low Slope: Waste & Penetration Allowances
The same discipline applies to existing-in-kind surveys. When a bid requires a roof and the drawings show a re-roof over an existing deck, the takeoff confirms what is measurable — the new field area and flashing counts — and marks what must be assumed, such as insulation condition or fastener point-up requirements. Those assumptions are stated up front so the owner and the roofing contractor are bidding the same roof.
- Sloped field measured on the true sloped surface, never the plan footprint
- Flashings measured in linear feet and priced as their own scope
- Waste factors applied by system and by roof geometry, not by guess
- Penetrations and curbs counted individually with their detailing
- Tear-off and removal separated from new installation in the takeoff
- Material order quantities delivered as net-to-gross, ready to buy
- Assumptions on deck condition flagged as assumptions before bid day
Priced in the Field, Not in the Footprint
"We sent a 24-sheet commercial set with three different membrane systems and a stair tower full of curbs. The takeoff came back in six days with flashing counted to the foot and penetrations itemized. We bought out the job from the CEDS sheet line by line."
Low-slope roofing contractor, Midwest — warehouse and office re-roof
Ready to price a roof you can actually win?
Send your roof plans and we'll confirm the systems, flashings and turnaround for your roofing estimate.
Roofing Estimating Questions
Turnaround depends on the roof plan size and complexity. A typical residential re-roof returns in three to four working days, while a commercial low-slope set with multiple membrane systems runs five to seven working days. We confirm the date before starting and schedule the work around your bid deadline rather than the other way around.
The roof plan with slopes and callouts, elevations and roof sections, and any spec sections that define the system, membrane thickness and flashing details. If you have a schedule of finishes or a roofing schedule, that improves the takeoff accuracy because it tells us the intended system for each area instead of leaving it to assumption. We will tell you if the set is missing enough to hold the bid.
Yes. Waste is applied by system and by roof geometry — typically 10–15% for steep-slope shingle work and 3–5% for low-slope membrane when sheets are scheduled to the plan. Requirements above that list the waste factor used on every section, so if your supplier or inspector needs a different allowance, you can adjust one number instead of redoing the takeoff.
Yes. The new installation scope is measured from the drawings normally, and the removal scope — tear-off squares, disposal, deck repairs, fastener redundancy — is carried as its own section. Because existing insulation and deck condition cannot be fully verified from drawings, those items are flagged as assumptions so the bid shows exactly what depends on field conditions.
In most cases, yes. Field membrane or shingle area is the easy part of a roof bid; the flashings, copings, terminations and penetrations are where square-foot shortcuts hide cost. A typical commercial roof takeoff carries 20 or more line items beyond the field membrane. CEDS counts each flashing in linear feet and each penetration individually, so the edges of your roof are priced like the edges — not averaged into the field.