Contracts

What is a scope of work in construction?

A scope of work (SOW) is the written description of the work a contractor or subcontractor must perform, including what is included, what is excluded, and the standards it must meet.

Two construction professionals review paper plans beside a tablet at a jobsite workbench.
Plan reviews connect field conditions, drawings, and the next decisions on a job. AI-generated illustration.

The scope of work is the part of a construction contract that says what you are actually being paid to do. It names the work, the materials, the boundaries with other trades, and the exclusions. Prices, schedules, and payment terms all rest on it. When a dispute starts with 'I thought that was in your scope,' the scope of work is the first document everyone pulls out.

On owner contracts, the scope is usually defined by the plans and specifications. On subcontracts, the general contractor writes a scope exhibit for each trade that carves out exactly which parts of those plans belong to that sub.

What a good scope of work includes

  • Work description. The systems or areas covered, referenced to drawing sheets and spec sections.
  • Inclusions. Items that are easy to argue about: layout, hoisting, cleanup, temporary protection, permits, testing, submittals, warranties.
  • Exclusions. What the party is not doing, written out.
  • Interfaces. Where this trade's work stops and the next one starts, such as who sets sleeves, who does firestopping, who connects to equipment.
  • Standards and quality. Codes, specs, tolerances, and approved products.
  • Site conditions and logistics. Working hours, access, storage, and who provides power and water.
  • Deliverables. Shop drawings, as-builts, O&M manuals, training.

A scope of work example

Say a GC is buying out the HVAC on a two-story office building. The bid drawings show rooftop units, ductwork, and a control system. The scope exhibit for the HVAC sub reads, in part:

  1. Furnish and install all HVAC work shown on M-series sheets and spec Division 23 sections listed in Exhibit B.
  2. Includes crane and rigging for rooftop units, curbs, and roof curb flashing coordination with the roofer.
  3. Includes controls wiring for HVAC equipment; power wiring to units by electrical contractor.
  4. Includes test and balance through an independent agency, with report submitted before substantial completion.
  5. Excludes roof penetrations framing (by GC) and fire smoke damper power (by electrical).

Item 3 alone heads off one of the most common trade fights on a building: who wires the controls and who wires power. Writing it down costs nothing. Arguing about it in month six costs days and money.

Common scope of work mistakes

  • 'Per plans and specs' and nothing else. That shifts the burden of interpretation to whoever has the least leverage.
  • Copying last job's scope. Old scopes carry old assumptions and miss new risks.
  • Not leveling against bids. If the sub's bid excluded something and your scope included it, settle it before signing. See bid leveling.
  • Ignoring gaps between trades. Items nobody owns become scope gaps the GC pays for.
  • Mixing scope and price assumptions. Keep the work description clear even if pricing is unit based.

Related terms

Scope of work connects to scope creep, change orders, the bid package, and buyout. For writing tips, read how to write a scope of work for subcontractors. Smart Business Automator carries the scope from the accepted estimate into the project and each subcontract, so the field works from the same description the office sold.

Frequently asked questions

Is a scope of work the same as a statement of work?

They are close. Statement of work is more common in government and services contracting. In construction, scope of work usually refers to the description of included and excluded work.

Who writes the scope of work?

The owner and design team define the overall scope through plans and specs. The GC writes scope exhibits for each subcontract. Residential contractors usually write the scope themselves in the proposal.

What happens when work is not in the scope?

It is extra work and should be handled with a change order before it is performed. If it was needed but not assigned, it is a scope gap and someone, often the GC, ends up paying.

How detailed should a scope of work be?

Detailed enough that a stranger could tell whether a given item is included. Spend the most words on interfaces between trades and on exclusions.

Sources

  1. WBDG SpecsIntact help: CSI MasterFormat
Written and edited by

Maurice Francois writes and edits construction operations guides for Smart Business Automator. More from Maurice on the Scaling Legends podcast.

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