What Does a General Contractor Actually Do? A Homeowner's Guide to the Full Process

Most homeowners only hire a general contractor once or twice in their lives. If you've never been through a major renovation or custom build, the process can feel like a black box — you know work is happening, but it's not always clear who is responsible for what, or what you should expect at each stage.

This guide walks through exactly what a general contractor does from the first conversation to the final walkthrough.

Pre-construction: where the real work begins

A common misconception is that contractors only matter once construction starts. In reality, the pre-construction phase is where a skilled contractor adds the most value.

This stage includes an initial consultation to understand the homeowner's goals, a site evaluation to assess existing conditions, coordination with any architects or designers involved, and a detailed project plan with scope, timeline, and cost breakdown.

Many projects that run into problems do so because the planning phase was rushed. A contractor who invests time upfront — asking the right questions, identifying potential issues before they appear on-site, and establishing clear expectations — sets the foundation for a project that runs smoothly.

Permitting and coordination

Before any work begins, your contractor obtains the necessary building permits from your local municipality. In Massachusetts, permits are required for most structural work, electrical and plumbing upgrades, and additions. Your contractor manages this process, submits the required documentation, and schedules inspections at the appropriate phases of construction.

At the same time, the contractor is coordinating subcontractors — the electricians, plumbers, framers, tile setters, and other specialists whose work needs to be sequenced correctly. A general contractor manages that schedule so that the right trade is on site at the right time, and no work is done out of order.

Active construction: managing the site

During construction, your general contractor is responsible for the quality, safety, and progress of everything happening on your property. This means daily supervision of subcontractors, on-site problem-solving, material management, and proactive communication with the homeowner.

Good contractors keep you informed without requiring you to chase them for updates. Expect regular progress reports, documented change orders if scope shifts, and honest conversations when unexpected issues arise — because in older New England homes, they almost always do.

Finish phase and final walkthrough

As construction moves into the finish phase — trim, paint, tile, cabinetry, fixtures — the contractor's role becomes one of meticulous coordination and quality control. Small details matter here, and an experienced contractor knows what to look for before calling the work complete.

The final walkthrough is your opportunity to review every detail of the finished project with your contractor before signing off. Any outstanding items, called a punch list, are addressed and resolved before the project formally closes.

After the project

A contractor's responsibility doesn't end at the final walkthrough. You should receive documentation for all warranties — from windows to appliances to structural work. And a contractor who stands behind their work will remain accessible for questions and follow-up needs after the project is complete.

Understanding this process helps you ask better questions, set realistic expectations, and recognize the difference between a contractor who is simply executing tasks and one who is actively managing your project from start to finish.

Somma Builders guides homeowners through every phase of the renovation process — from first consultation to final walkthrough. Serving Greater Boston and surrounding communities.