Buying a fixer-upper in Boston to renovate and sell or rent

How to underwrite a renovation deal

Work backward from the finished product. The core formula:

After-repair value − selling costs − rehab budget − contingency − holding costs − buying costs − target profit = maximum purchase price

After-repair value (ARV). Base it on recent closed sales of renovated homes that match what you’ll deliver: same area, similar size, bedroom and bath count, parking and lot. Use sales, not listings, and be honest about whether your finishes will match the comps. Ask us for a comparable sales review before you commit; an appraiser will do the same exercise for your buyer’s lender.

Rehab budget. Walk the house with at least one general contractor and get a written scope and estimate. Separate cosmetic work (paint, floors, fixtures) from systems (electrical, plumbing, heat, roof) and structure, because systems and structure drive permits and surprises.

Contingency. Older homes hide things behind plaster. Carry a separate contingency line and don’t spend it on upgrades. The example below uses 15 percent; a house with unknown wiring, an old oil tank or water in the basement can justify more.

Holding costs. Add loan interest, points and lender fees, property taxes (see local tax rates), builder’s risk or vacant-property insurance, utilities, and the months on market after the work is done.

Buying and selling costs. You pay closing costs twice: once as a buyer (attorney, title insurance, recording, lender fees) and again as a seller (commission, your attorney, the smoke and CO certificate, mortgage discharge and the deed excise tax). See Massachusetts closing costs.

Massachusetts transaction costs and the “flip tax” question

Deed excise tax. Massachusetts charges a deed excise of $2.28 per $500 of the price outside Barnstable County, about $4.56 per $1,000, under M.G.L. c. 64D, § 1. The seller pays it, so on a flip you usually don’t pay it when you buy, but you do pay it on the resale. See the deed excise tax guide for the calculation.

Is there a flip tax or transfer fee? As of October 2026, Boston has no transfer fee, no general local-option transfer fee has passed statewide, and there’s no special tax on quick resales. (A few island communities, such as Nantucket and Martha’s Vineyard, have long-standing land bank fees under their own special laws.) Here’s where the proposals stand:

• Boston. The City Council’s home rule petition became H.5464, which would let Boston charge the seller a fee of up to 2 percent on the portion of a sale price above $2,000,000. Its stated purpose includes “discouraging rapid repeat sales,” but it has no separate rate for short holding periods. Its only recorded action is a May 28, 2026 referral to the House Committee on Revenue.
• Statewide local option. H.3056 and S.1937 would let any city or town adopt a transfer fee for affordable housing. S.1937 was reported favorably and sent to Senate Ways and Means in December 2025. H.3056’s reporting deadline was extended to January 4, 2027.
• The 2024 housing law. Governor Healey’s 2023 housing bill included a local-option transfer fee, but the Legislature left it out of the Affordable Homes Act signed in August 2024.

Bills that haven’t passed by the end of the two-year session in early January 2027 die and would have to be refiled. Check the bill pages before you close on a deal you plan to resell.

Financing a fixer-upper

Hard money and bridge loans. Most flips are financed with private short-term loans or cash. These loans usually lend against the purchase and the rehab budget, release renovation money in draws after inspections, and cost more than a standard mortgage. Compare the rate, points, draw process, extension fees and prepayment terms, and build the full cost into holding costs.

Renovation mortgages. Two agency programs finance the purchase and renovation in one loan:

• Fannie Mae HomeStyle Renovation. According to the Selling Guide (B5-3.2-02), it covers one- to four-unit principal residences, one-unit second homes and one-unit investment properties. On a purchase, renovation costs can be up to 75 percent of the lesser of the purchase price plus renovation costs, or the as-completed appraised value.
• FHA 203(k). For owner-occupants. HUD’s Mortgagee Letter 2024-13 raised the Limited 203(k) maximum rehab cost to $75,000 for nonstructural work. The Standard 203(k) handles larger and structural work and requires a HUD 203(k) consultant. It fits a buyer who will live in the house, including a two- to four-family, not a flip.

Permits and licensed contractors

Boston building permits. Boston’s Inspectional Services Department (ISD) issues two kinds:

• A short-form permit for minor alterations, repairs or replacements that don’t change the structure or use. The fee is $20 plus $10 per $1,000 of estimated cost.
• A long-form permit for major alterations that change the structure or use, including moving walls, adding units or changing occupancy. ISD’s page lists plans stamped by a Massachusetts registered architect or engineer, a certified plot plan and zoning review, and outside approvals such as the Landmarks Commission in historic districts. The fee is $50 plus $10 per $1,000 of estimated cost. Long-form permits take longer to issue, so build the wait into your schedule.

As of October 2026, a $150,000 job would carry about $1,520 in short-form fees or $1,550 in long-form fees. Electrical, plumbing and gas work need separate permits pulled by licensed trades. ISD warns that starting work before a permit is issued can mean double fees or a violation. Outside Boston, the local building department sets its own process and fees.

Construction Supervisor License. Under the state building code (780 CMR 110.R5), permitted work on one- and two-family homes is generally supervised by a licensed construction supervisor. The homeowner exemption applies only to an owner who lives or intends to live in the home, and anyone who builds more than one home in two years isn’t treated as a homeowner. An investor who won’t live there should expect to hire a licensed supervisor for permitted work.

Home Improvement Contractor (HIC) registration. Chapter 142A requires registration and written contracts for residential contracting on existing owner-occupied buildings with one to four units, and its definitions are tied to owner occupancy. The state’s HIC Guaranty Fund can pay eligible homeowners up to $25,000 toward an unpaid judgment against a registered contractor. If you’re buying a house you won’t live in, ask your attorney whether those protections reach your project. Either way, use a written contract, check registration and insurance, and tie payments to completed, inspected work.

Lead, asbestos and other hazards in older homes

Lead renovation rules. Massachusetts runs its own version of EPA’s Renovation, Repair and Painting program for pre-1978 housing. Under 454 CMR 22.11, unless testing shows the surfaces are lead-free, work that disturbs more than 6 square feet of painted surface per room inside, or more than 20 square feet outside, or involves window replacement or partial demolition of painted surfaces, must follow renovation work practices. Contractors doing that work for pay need a license from the state Department of Labor Standards. Nearly every gut renovation of an older Boston house crosses that line.

The lead law. Renovating doesn’t automatically delead a house. If you rent the home and a child under six lives there, M.G.L. c. 111, § 197 requires the owner to bring it into compliance. When you resell, you must give the buyer the Property Transfer Lead Paint Notification and any lead reports or compliance letters you have. Deleading during the renovation, by licensed deleaders where required, can be cheaper than doing it later, and a compliance letter is something buyers and tenants value.

Asbestos. Old pipe wrap, boiler insulation, floor tiles and some siding can contain asbestos. MassDEP requires an asbestos removal notification ten working days before removal begins. Get a survey before demolition so it doesn’t stop your schedule.

Oil tanks, wiring and water. Ask about current and abandoned heating oil tanks, including buried ones, knob-and-tube wiring (which some insurers won’t cover), undersized electrical service, galvanized supply pipes, and basement water. Each can add cost that a cosmetic budget won’t catch.

Selling the renovated house

Disclosure. Massachusetts has no general seller disclosure form, and a private homeowner selling their own home generally isn’t subject to the Consumer Protection Act (Lantner v. Carson, 374 Mass. 606 (1978)). Someone who buys and resells homes as a business may be. Chapter 93A prohibits unfair or deceptive practices in trade or commerce, and the Attorney General’s regulation 940 CMR 3.16(2) treats failing to disclose a fact that might have influenced a buyer not to buy as a violation. Keep your permits, inspection sign-offs and contractor records, and answer questions accurately. Your attorney can advise on what to disclose.

Smoke and CO certificate. Before closing, the local fire department inspects for smoke and carbon monoxide alarm compliance under M.G.L. c. 148, § 26F and § 26F½. Renovation work done under a permit can change which alarm rules apply, so ask your electrician to install to the permitted plans.

Title 5 septic. Most of Boston and its close-in suburbs are on sewer, but if your house has a septic system, Title 5 generally requires an inspection within two years before the sale, or three years if the system has been pumped every year, according to MassDEP’s guide. A failed system must be upgraded, which can change your budget.

For the full sale process, see selling a house in Massachusetts.

Taxes on a flip

Taxes can change whether a deal is worth doing. This is a high-level overview, so get advice from a tax professional before you buy.

• Ordinary income or capital gain. IRS Publication 544 lists property held mainly for sale to customers as a noncapital asset, so a dealer’s profit is ordinary income. Whether you’re a dealer depends on facts such as how often you buy and sell and why you held the property.
• Short holding periods. Even if a gain is capital, assets held one year or less get short-term treatment at ordinary rates (Topic 409). Massachusetts taxes short-term capital gains at 8.5 percent, according to the state’s tax expenditure budget.
• No 1031 exchange for flips. The IRS says real property held primarily for sale doesn’t qualify for a like-kind exchange.
• Rentals are different. A home you rent out is generally depreciated and taxed differently when you sell it. Track every renovation cost either way.

Renting it out instead

If the numbers work better as a rental, plan for landlord duties from day one. Boston requires annual rental registration by July 1. As of October 2026 the fee is $25 per unit for a first registration and $15 to renew, and the city inspects registered properties at least once every five years. You’ll also handle security deposits and last month’s rent under state law, and the lead law if a child under six lives in the home. You can’t refuse to rent to families with young children because of lead paint. Massachusetts prohibits rent control on most private housing under chapter 40P. Our guide to buying a multi-family in Boston covers these duties in more detail, and mortgage options by property type explains how lenders treat investment properties.

Common mistakes

Due diligence checklist

This guide is general information, not legal, tax or lending advice. Confirm the details with a real estate attorney, your lender and a tax advisor.

If you’re weighing a fixer-upper and want help pricing the finished house or comparing older homes across neighborhoods, The Pettengill Group can walk you through it. Start a search or, if you already own one, get a home value estimate.