How Much Does an Owner's Representative Cost? Fees Explained for Boston Homeowners
How much does an owner's representative cost? How owner's reps charge, what the fee buys, and when it pays off on a Somerville or Cambridge renovation.
Mateus MagnoLicensed Construction Supervisor · October 20, 2026 · 4 min read
An owner's representative usually charges in one of three ways: a flat fee for a defined scope, an hourly rate, or a percentage of construction cost. The right structure depends on your project size and how much help you need. I quote a fixed written scope after a free consultation, so you know the cost before you commit.
How much does an owner's representative cost? There is no single price, because owner's reps charge in different ways depending on the size of the job and how much you want them to handle. On a Somerville or Cambridge renovation, the fee is usually set as a flat fee, an hourly rate or a percentage of construction cost.
In this guide I explain each fee structure, what the fee actually buys you, when an owner's rep pays for itself, and how I price my own work.
What is an owner's representative?
An owner's representative (owner's rep) works for you, not for the contractor. Their job is to protect your budget, schedule and quality from design through final inspection. If you want the long version, read my post on what an owner's representative is.
Massachusetts takes this role seriously on public projects. Under M.G.L. c. 149, § 44A½, public agencies must hire an owner's project manager for building projects estimated at $1,500,000 or more. That person must be independent of the designer, general contractor and subcontractors. Homeowners don't fall under that law, but the same idea applies: someone on your side who answers only to you.
How much does an owner's representative cost? The 3 fee structures
| Fee type | How it works | Best for |
|---|---|---|
| Flat fee | One fixed price for a written scope of services | Kitchens, baths, basements and other clearly defined renovations |
| Hourly | You pay for the time used, often with a cap | Bid reviews, contract reviews, a second opinion or a troubled job |
| Percentage of construction cost | The fee scales with the size of the project | Large additions, ADUs and whole-house renovations |
Whatever the structure, ask for it in writing, with the services listed, the number of site visits, and what triggers extra charges. A vague fee is how a helpful role turns into a surprise bill.
What the owner's rep fee buys you
- Budget control: a line-item budget before demolition, and tracking of every dollar against it.
- Contractor bids: one clear scope that every bidder prices, so you compare apples to apples.
- Contract review: checking that the contract meets state rules. For example, the Massachusetts home improvement contract rules require a written contract for jobs over $1,000 and cap the up-front deposit at one-third of the contract price or the cost of special-order materials.
- Schedule: sequencing trades and inspections so nobody waits on anybody.
- Change orders: pricing every change before the work, in writing.
- Inspections and quality: walking the job before walls close and before each payment.
- Permits done right: making sure the registered contractor pulls the permit. The state's Guaranty Fund rules only cover homeowners when the contractor, not the homeowner, secured it.
When an owner's rep pays for itself
An owner's rep fee makes the most sense when the cost of a mistake is bigger than the fee. In Greater Boston that is often true:
- Old houses: triple-deckers and 1900 to 1930 homes in Davis Square, Porter Square or East Somerville hide surprises. A clear allowance and change-order process keeps those surprises from blowing up the budget.
- Bid gaps: the cheapest bid often leaves out demo, disposal, lead-safe work or permits. Spotting those gaps before you sign is where the savings usually come from.
- Busy owners: if you work full-time, someone has to be on site and answer the contractor's questions the same day.
- Bigger scopes: additions and backyard ADUs involve zoning, design and many trades at once.
On a small, simple job with a contractor you already trust, you may not need a full-service rep. An hourly bid and contract review can be enough.
How I work as an owner's rep in Somerville and Cambridge
I'm a licensed Massachusetts Construction Supervisor and registered Home Improvement Contractor based at 55 Davis Square, and I've managed over $3 million in projects. My process is simple:
- Free consultation at your home to understand the project and your goals.
- Written scope and fee so you know exactly what I do and what it costs before you sign anything.
- Bids and contract from registered contractors, leveled line by line.
- Construction oversight with site visits, payment checks and change-order control through final inspection.
Every house is different, so I don't quote a fee until I've seen the job. You can also compare options on my services page.
Need a hand?
If you're planning a renovation in Somerville, Cambridge, Medford or anywhere in Greater Boston, book a free walkthrough. I'll send a written line-item budget and a clear owner's rep scope, usually within 48 hours.
Frequently asked questions
How much does an owner's representative cost?
It depends on the project. Owner's reps usually charge a flat fee, an hourly rate or a percentage of construction cost, and the scope of services should be written down before you sign.
What does an owner's rep do on a home renovation?
An owner's rep works only for the homeowner: writing the scope, getting and comparing contractor bids, reviewing the contract, tracking the budget and schedule, and checking work before payments.
Is an owner's representative worth it?
It is usually worth it when mistakes would cost more than the fee, such as on older Greater Boston homes, larger renovations, additions or ADUs, or when the owner can't be on site.
What is the difference between an owner's rep and a general contractor?
A general contractor builds the project and is paid by you to do the work. An owner's rep oversees the project on your behalf and stays independent of the contractor.
Mateus Magno is the founder of Magno & Co — a licensed Massachusetts Construction Supervisor (CS-123658), registered Home Improvement Contractor (HIC #220484) and certified Lead-Safe Renovator Supervisor who has renovated and managed over $3 million in projects across Greater Boston.
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