Contractor Scope of Work for a House Flip: A Bid Comparison and Change-Order Guide

Overview

A contractor bid is only useful when you can tell exactly what the contractor agreed to provide. A low total may exclude demolition, permits, finish materials, disposal, repairs behind walls, or final cleanup. A higher bid may include those items—or simply contain more generous assumptions. Comparing totals alone can therefore produce a misleading result.

A scope of work turns the renovation plan into a shared reference document. It should describe the property condition, each task, the expected materials, completion standard, responsible party, exclusions, schedule assumptions, and payment milestones. Attach the scope to the construction agreement and require written approval for work that changes the price or completion date.

For a fix-and-flip project, the scope should also match the resale strategy. If the planned finishes support the expected after-repair value, the contractor needs clear direction on product quality, layout, durability, and visual consistency. Before requesting bids, review the property's likely repairs with an inspection checklist and confirm the renovation plan against your after-repair value worksheet.

The goal is not to describe every construction technique. It is to remove avoidable ambiguity. A contractor should be able to price the same work as competing contractors, and you should be able to verify whether the finished work meets the agreement.

How to estimate

Start with one master scope rather than asking each contractor to create a different interpretation of the project. Organize it by trade or work category, such as general conditions, demolition, structural work, roofing, exterior, plumbing, electrical, HVAC, insulation and drywall, flooring, kitchen, bathrooms, painting, finish carpentry, appliances, landscaping, cleaning, and closeout.

Use this scope-of-work format

1. Location: Identify the room, elevation, system, or specific area.
2. Task: Describe what will be removed, repaired, installed, or finished.
3. Materials: State the product category, grade, dimensions, finish, or acceptable equivalent.
4. Completion standard: Explain what “complete” means, including testing, alignment, caulking, touch-up, and cleanup where relevant.
5. Responsibility: Identify who supplies materials, obtains permits, coordinates inspections, and handles disposal.
6. Exclusions: List work not included, such as concealed damage, utility upgrades, engineering, or owner-supplied items.
7. Price: Show labor, materials, subcontractors, taxes or fees where applicable, and any allowance separately.

Use measurable language wherever possible. “Paint the interior” is incomplete. “Prepare and paint the listed walls, ceilings, doors, and trim; repair ordinary nail holes; apply the agreed number of coats or additional coats needed for uniform coverage; protect adjacent surfaces; and remove debris” gives the bid a clearer basis.

Request that every bidder return pricing in the same order as the scope. A simple comparison table can include columns for scope item, contractor A, contractor B, contractor C, included materials, exclusions, allowance, estimated duration, and questions. Normalize the bids before choosing one. Add excluded work back into each total, replace vague allowances with comparable assumptions, and flag any line that says “as needed” without a defined limit.

Separate fixed prices from allowances

A fixed price applies to defined work under stated assumptions. An allowance is a placeholder for an item that has not been selected or fully measured, such as tile, lighting, plumbing fixtures, appliances, or a replacement door. Allowances are useful, but they are not guaranteed final costs. Record the allowance amount, what it covers, whether labor is included, and how overages or credits will be calculated.

For example, an allowance should state whether it covers only the purchase price of tile or also freight, trim pieces, setting materials, waste, and installation. Without that detail, a seemingly reasonable allowance can create a budget gap later.

Inputs and assumptions

A reliable bid comparison depends on reliable inputs. Give each contractor the same basic information: property address, plans or sketches if available, inspection findings, desired finish schedule, room dimensions, photographs, utility information, and target completion date. If a condition is unknown, label it as unknown instead of implying that it is included.

Scope inputs to document

• Existing condition: Note visible damage, age, moisture signs, uneven floors, outdated systems, and areas that require testing or opening.
• Design decisions: List layouts, cabinet style, countertop category, flooring transitions, paint sheen, fixture locations, and appliance dimensions.
• Permit and inspection responsibilities: State who prepares applications, schedules inspections, supplies documents, and corrects failed work. Verify local requirements before signing; the house flip permit checklist can help organize this review.
• Site rules: Define access hours, lockbox or key control, utility use, material storage, security, neighbor considerations, and cleanup.
• Schedule: Identify the planned start, major milestones, owner selections, inspection dependencies, and reasonable completion conditions.
• Contingency: Keep a separate reserve for unknown conditions. Do not disguise contingency money as a contractor allowance or treat it as available profit.

Review whether the scope matches the broader rehab budget. A room-by-room budget can track planned, committed, paid, and remaining costs; use the rehab budget template to keep contractor commitments connected to the overall project.

Payment and documentation assumptions

Payments should correspond to observable progress, not simply calendar dates. Possible milestones include approved mobilization, completed demolition and rough work, passed inspections, installation of major finishes, substantial completion, and final punch-list completion. Define the documentation required for each milestone, such as photographs, receipts for owner-paid items, inspection results, warranties, manuals, lien releases where appropriate, and a list of unresolved items.

A written agreement should identify insurance, licensing or registration requirements where applicable, responsibility for subcontractors, dispute procedures, cleanup standards, warranty terms, and procedures for protecting the property. Contract terminology and legal requirements vary by location, so have the agreement reviewed locally when the project warrants it.

Worked examples

Assume a small flip has three contractor bids for the same kitchen and bathroom scope:

Contractor B appears lowest, but the bids are not equivalent. Its material allowance is lower, demolition is separately priced, and permit coordination is excluded. If you add the $3,500 demolition line and a $1,000 permit placeholder, the adjusted comparison becomes $43,300 before resolving whether the smaller material allowance is adequate. Contractor A may be the clearest bid, while Contractor C may include a broader service level. The right choice depends on scope completeness, qualifications, schedule, communication, and documented references—not just the original total.

Now consider a change order. During demolition, the contractor finds damaged subflooring under a bathroom. The contractor should provide a written request stating the affected area, cause or observed condition, proposed repair, labor, materials, schedule impact, and added or credited amount. For example: remove 32 square feet of damaged subfloor, inspect supporting framing, install matching structural-grade material, reconnect the toilet flange if required, and add one working day; labor and materials are listed separately.

Do not approve “repair bathroom floor” as a lump-sum phrase when the extent is uncertain. Ask for a not-to-exceed amount or a defined investigation step followed by a second approval. Record the decision in the budget, update the remaining contingency, and save photographs with the signed change order.

When to recalculate

Recalculate the project budget whenever a bid is revised, an allowance becomes a purchase, a selection changes, a permit or inspection requires additional work, or concealed conditions are discovered. Also update the schedule and holding-cost estimate when a change order affects completion. A small construction change can matter to financing, utilities, insurance, taxes, staging, and the expected sale date; the project cost and records checklist can help preserve the paper trail.

Before signing, run this final review:

1. Send the identical scope, plans, photos, and finish assumptions to every bidder.
2. Mark every item as included, excluded, allowance, owner-supplied, or pending selection.
3. Compare adjusted totals rather than headline totals.
4. Confirm the milestone payment schedule and required closeout documents.
5. Set a written change-order process with approval authority and budget tracking.
6. Verify that the selected scope supports the resale plan; avoid adding upgrades that the comparable properties do not justify.
7. Save the signed scope, bids, selections, invoices, photographs, inspection records, and changes in one project folder.

Revisit the scope before each major phase, not only when something goes wrong. A short weekly review of completed work, committed costs, open selections, pending approvals, and remaining contingency can expose drift early—when it is still possible to adjust the plan.