Massachusetts Metal Buildings: Kit Prices, Permits & Town Load Tables

In most states, finding the design loads for your building means a map, an online lookup or a call to the building department. Massachusetts does something different: its building code prints a ground snow load, a design wind speed and seismic values for every one of its 351 cities and towns, in a single table. Look up your town and there is the number.

The catch is in the footnotes. The same table tells you, in plain words, that for many sites the listed number is not the one to design to. In more than 60 higher-elevation towns, a building sited above the town's average elevation carries more snow than the table shows, and much of the Berkshires are flagged as places where the wind can be stronger than listed. A steel building is engineered to one set of loads and then fabricated, so the difference between the town's number and your site's number matters.

This page covers what a metal building kit costs in Massachusetts, how to read the town table and its footnotes, the 35,000 cubic foot line that decides who has to supervise construction, why the conservation commission often comes before the building department, the three energy codes towns choose between, and what the state's new accessory dwelling unit law means for a shop with living space.

How Much Does A Metal Building Kit Cost in Massachusetts?

A metal building has two prices, and they behave differently.

The kit price covers the engineered steel package: frames, purlins and girts, wall and roof panels, fasteners, anchor bolts and stamped drawings. Steel is priced nationally, so the kit costs essentially the same in Massachusetts as anywhere else.

The turnkey price adds the concrete foundation and erection labor. That part is local, and in Massachusetts it runs about 18% above the national average.

Size	Kit only	Massachusetts turnkey	National turnkey average
30x40 (1,200 sq ft)	$21,000 – $24,700	$31,100 – $36,500	$29,500 – $34,700
40x60 (2,400 sq ft)	$39,400 – $46,300	$60,200 – $70,600	$57,000 – $66,900
50x100 (5,000 sq ft)	$76,400 – $89,700	$121,000 – $142,000	$114,200 – $134,100
60x120 (7,200 sq ft)	$105,900 – $124,400	$171,100 – $200,900	$161,200 – $189,200

On a 40x60 the Massachusetts premium is about $3,400 at the midpoint. On a 60x120 it is closer to $10,800. All of it is in the site work. A supplier quoting a higher kit price because the building is going to Massachusetts is quoting something other than the steel.

For a typical 40x60, the site-built portion breaks down to roughly $14,200 for the concrete foundation and $8,400 for erection. Those ranges assume a bare shell on level, accessible ground, with no site clearing, utilities or interior finish. To get a number before you call for your own dimensions, or to compare cost per square foot by size, start there.

Two Massachusetts-specific costs sit outside those figures and are worth budgeting early: the 48-inch frost depth, covered below, and any wetland filing if your site is near water.

Massachusetts Publishes a Load Number for Every Town

The Massachusetts State Building Code, 780 CMR, is in its tenth edition, based on the 2021 International Codes. It took effect on October 11, 2024, and since June 30, 2025 it has been the only edition in force.

Section 1604.11 sets out how design loads are chosen:

"Ground snow load, pg, basic wind speed, V, and earthquake response accelerations for the maximum considered earthquake, SS and S1, for each city and town in the Commonwealth shall be as given in Table 1604.11."

Every city and town is listed, 351 in all, each with its own ground snow load, a minimum flat roof snow load, a design wind speed for each of the four risk categories, and two seismic values.

What the table looks like

A few rows, taken directly from the table:

Town	Ground snow load (psf)	Min. flat roof snow (psf)	Wind speed, Risk Category II (mph)
Boston	40	30	120
Worcester	50	35	117
Springfield	35	35	115
Lowell	50	30	116
Fitchburg	60	35	115
Pittsfield	50 (mean elevation 1,124 ft)	40	112
Florida	60 (mean elevation 1,784 ft)	40	111
Barnstable	30	25	130
Nantucket	25	25	137

Most shops, garages, barndominiums and warehouses fall in Risk Category II. Some low-occupancy agricultural and minor storage buildings qualify for Category I, which carries a lower wind speed; buildings people gather in can fall higher. Your engineer assigns the category, and it is worth confirming which column a quote was drawn from.

Snow and wind pull in opposite directions

The table shows how differently one small state can load a building. Nantucket's design wind speed is 137 mph and its ground snow load is 25 psf. Fitchburg's is 115 mph and 60 psf. The highest snow values in the table, 60 psf, sit in the north-central towns such as Athol, Fitchburg, Leominster, Townsend and Winchendon, and in the Berkshire hill towns before any elevation increase. The highest wind speed in the table is on Nantucket.

So there is no such thing as a "Massachusetts-rated" building. A frame that is light on steel for a Cape Cod wind load can be light for a completely different reason in Worcester County, where snow governs. When you compare quotes, the town name is the first thing to check, because two suppliers who assumed different towns are pricing different buildings.

The Footnotes That Change Your Number

The table is precise. Its footnotes are what stop it being the final word, and most buyers never read them.

Elevation: more snow for every foot above your town's average

Footnote 3, in full:

"Increase Pg listed by 0.021 x (Site Elevation - Mean Elevation) when the Site Elevation exceeds the Mean Elevation."

The listed ground snow load applies at the town's mean elevation. Build above it and the snow load rises by 0.021 psf for every foot of difference. A site 400 feet above the town's mean adds 8.4 psf. In Florida, where the listed load is 60 psf at a mean elevation of 1,784 feet, a site 400 feet higher carries 68.4 psf.

The footnote is not attached to every town. It applies to more than 60 higher-elevation towns, the ones whose entry lists a mean elevation: the Berkshires, the hill towns on both sides of the Connecticut River valley, and upland towns in north and central Worcester County such as Princeton, Rutland, Paxton, Gardner, Westminster and Winchendon. Boston, Worcester and Fitchburg carry no elevation adjustment.

Those hill towns are exactly where many rural metal buildings go up, on ridges and hillsides with room for a big footprint. In a footnoted town, a quote engineered to the listed number alone is under-designed for any site above the town's mean, and the frames will already have been fabricated to it.

Special Wind Regions in the Berkshires

Footnote 2 is attached to Pittsfield, Adams, Florida and dozens of other western Massachusetts towns:

"Special Wind Region. Local conditions may cause higher wind speeds than the tabulated values. See ASCE/SEI 7."

In other words, the table gives a number and then warns that terrain in those towns can produce stronger winds than it shows. On an exposed hilltop or in a funneling valley, the listed speed is a starting point for the engineer, not a finished answer.

The roof snow floor

Footnote 1 sets a minimum:

"The design flat roof snow load shall be the larger of the calculated flat roof snow load using Pg or the value of Pf listed in this table."

The engineering calculation that turns ground snow into roof snow can come out lower than the table's minimum flat roof value. When it does, the table value wins. In Pittsfield that floor is 40 psf. This is mostly a check on your engineer rather than something you need to calculate, but it explains why two roofs in two towns with similar ground snow loads can be designed differently.

The table's wind speeds are also stated as ultimate design wind speeds. Some suppliers still quote in an older convention that produces a smaller-looking number for the same design, so a lower mph figure on one quote does not automatically mean a weaker building. Ask which convention each quote uses before comparing them.

Seismic: highest in the northeast of the state

The same table carries two seismic values per town, and they rank the state in an order most people would not guess. Lowell's short-period value is 0.360 and Fitchburg's is 0.300. Nantucket's is 0.123. Engineering reviews of the tenth edition report that its updated seismic values moved many ordinary buildings on the North Shore from Seismic Design Category B to C, which adds bracing and connection requirements.

Two practical points follow. A drawing set or quote produced under the ninth edition, which could be used until June 30, 2025, was engineered to different wind and seismic values, so do not reuse an older quote without asking what it was designed to. And north-eastern Massachusetts is where seismic, not snow or wind, is most likely to add steel.

The questions to put to a supplier

Ask every supplier the same four things:

• Which town's row did you use? If your town carries the elevation footnote, ask what site elevation they used and whether they applied the increase.
• Which risk category did you design to?
• If the site is in a Special Wind Region, what wind speed did you use, and why?
• Which edition of 780 CMR did you design to? The answer should be the tenth.

A supplier who answers all four has engineered your building. One who answers "Massachusetts code" has engineered a building somewhere in Massachusetts.

35,000 Cubic Feet, and the Roof Counts

Massachusetts decides who must supervise construction by the building's volume. Two different rules meet at the same line, 35,000 cubic feet.

Below the line: a licensed construction supervisor

Under 780 CMR 110.R5, anyone supervising construction regulated by the building code must hold a Construction Supervisor License. The license covers "Buildings of any use group which contain less than 35 000 cubic feet … of enclosed space," and separately "One- and two-family dwellings or any accessory building thereto, irrespective of size."

Homeowners are exempt when building on their own property:

"Any homeowner performing work for which a building permit is required shall be exempt from the licensing provisions of 780 CMR 110.R5, provided that if a homeowner engages a person(s) for hire to do such work, then such homeowner shall act as supervisor."

A homeowner is a person who owns a parcel with a one- or two-family dwelling on it, or planned for it, and lives there or intends to. The code adds a limit aimed at spec builders: "A person who constructs more than one home in a two-year period shall not be considered a homeowner." If you hire an erection crew under the homeowner exemption, you are the supervisor of record, with the responsibility that carries.

Agricultural buildings "which are not open to the public or otherwise made available for public use" are also exempt from the license requirement.

One question worth asking your building department early: the code separately states that the homeowner exemption "may not be utilized to receive a permit to install, erect, or oversee the field erection of manufactured buildings." That provision is aimed at factory-built units, not bolted steel frames, but confirm how your department treats a pre-engineered kit before you rely on doing it yourself.

At or above the line: an engineer or architect on site

Once a building reaches 35,000 cubic feet, 780 CMR 107.6 requires construction control by a registered design professional. The engineer or architect must review shop drawings and submittals, "be present at intervals appropriate to the stage of construction," and at the end "file a final document to the building official" stating that the work was done in accordance with the approved plans. The general contractor has to be named on the permit.

Three exemptions keep most private buildings out of it:

• "Any building containing less than 35,000 cubic feet of enclosed space."
• "Any one or two-family dwelling or any accessory building thereto."
• "Any building used exclusively for agricultural purposes."

So a shop behind your house is exempt at any size, and so is a building used only for farming. Construction control catches standalone commercial and business buildings.

Run your building through it

The volume is "measured to the exterior surfaces of walls and roofs and to the top of a ground supported floor." That means the space under the roof counts, not just the walls.

Building	Walls	Roof space (1:12 pitch)	Total	Against 35,000 cu ft
30x40, 14 ft eave	16,800	750	17,550	Under
40x60, 12 ft eave	28,800	2,000	30,800	Under
40x60, 14 ft eave	33,600	2,000	35,600	Over
50x100, 16 ft eave	80,000	5,208	85,208	Over

A 40x60 at a 14-foot eave is 1,400 cubic feet under the line on its walls and 600 over once the roof is included. If it is a standalone business building, that is the difference between a licensed construction supervisor and an engineer's site visits plus a final report. Two feet of eave height is a real design lever. Decide it deliberately, not by habit. 40x60 sizing and cost covers the eave heights and door sizes typically specified on the most-requested footprint.

The Conservation Commission Comes First

For many rural Massachusetts sites, the first approval is not the building permit. It is from the town conservation commission, under the state Wetlands Protection Act.

The 100-foot buffer zone

State wetland regulations define a Buffer Zone extending 100 feet from wetlands, banks, and other protected resource areas. Work in the buffer zone that does not qualify as minor "is subject to regulation under M.G.L. c. 131, § 40 and requires the filing of a Notice of Intent."

A Notice of Intent is a formal application, usually prepared by an engineer or wetland consultant, reviewed at a public hearing, and approved with an Order of Conditions that governs how you build. It runs on its own timeline, separate from the building permit.

The riverfront area

Rivers get a wider protected strip. The Riverfront Area is the land within 200 feet of a river's mean annual high-water line. It narrows to 25 feet in Boston, Brockton, Cambridge, Chelsea, Everett, Fall River, Lawrence, Lowell, Malden, New Bedford, Somerville, Springfield, Winthrop and Worcester, and in other designated densely developed areas.

Within it, the state's performance standard generally allows alteration of "up to 5000 square feet or 10% of the riverfront area within the lot, whichever is greater," with conditions. A 40x60 is 2,400 square feet before grading, a driveway and a laydown area for steel. On a small riverfront lot, that allowance can be used up quickly.

The lots big enough for a metal building are often the lots with a stream, a pond or wet ground somewhere on them. Check the wetland picture before you commit to a building location or order steel. Some towns also have their own wetland bylaws that go further than the state rules, so ask your conservation commission what applies to your parcel.

Farm Buildings: A Zoning Protection, Not a Permit Exemption

Massachusetts protects agriculture strongly, but the protection sits in the zoning law, not the building code.

M.G.L. c. 40A § 3 says a town may not "prohibit, unreasonably regulate, or require a special permit for the use, expansion, reconstruction or construction of structures thereon for the primary purpose of commercial agriculture." The protection may be limited to parcels of 5 acres or more, or 2 acres or more if the agricultural use "annually generates at least $1,000 per acre based on gross sales dollars."

The test is $1,000 per acre, not a flat $1,000. A 4-acre parcel needs $4,000 in annual agricultural sales. Farm stands carry an additional test: 25 percent of the products for sale must come from the owner or lessee of the land, with alternative combinations involving other Massachusetts-grown products.

The building code treats farm buildings more favorably than other buildings in two ways covered above: no licensed construction supervisor for agricultural buildings not open to the public, and no construction control for buildings used exclusively for agriculture. But the building code's list of work exempt from permits contains no agricultural exemption. A new barn or equipment building still needs a building permit. Confirm with your building department before you assume otherwise.

The protection also follows the use. A barn that becomes an event venue, a store open to the public or a workshop for an outside business can lose both the zoning protection and the code exemptions.

Energy Code: Your Town Picks One of Three

Massachusetts layers energy requirements on top of the building code, and each town chooses which level applies. As of June 4, 2026, 242 municipalities had adopted the Stretch Code and 60 had adopted the Specialized Opt-in Code. The remaining communities, home to about 7% of residents, use the Base Code.

For an unheated storage building, this rarely matters. For anything with living space in it, it can change the heating system.

In a Specialized Code town, a new home must be built to one of three net-zero pathways:

• Zero Energy — a certified energy rating of zero or better.
• All-Electric — no fossil-fuel heating, water heating or appliances, with a strict efficiency rating.
• Mixed-Fuel — gas or oil heat is allowed, but the home needs at least 4 kW of solar per dwelling unit, a tighter efficiency rating, and dedicated electrical circuits pre-wired for a future switch to electric equipment.

New homes over 4,000 square feet of conditioned floor area cannot use the mixed-fuel route at all. They must be zero-energy or all-electric. A large barndominium in a Specialized Code town cannot be heated with propane.

A heated shop or commercial building falls under the commercial energy provisions, which work differently. Either way, find out which of the three codes your town has adopted before the heating plan is drawn. It is a one-line answer from the building department, and it can change the whole mechanical design.

Massachusetts Barndominiums, Shop-Houses and the New ADU Law

Massachusetts has recently become more favorable to living space in or beside a metal building.

Living space over the shop is now allowed by right

Since February 2, 2025, one accessory dwelling unit is a protected use in single-family zoning districts statewide. An ADU can be up to half the floor area of the main house or 900 square feet, whichever is smaller, and it can be fully detached. The state's own description includes "a cottage or converted garage in a backyard."

Towns may still regulate setbacks and building bulk and height, and may require site plan review. They may not require a special permit, owner occupancy or a family relationship, and parking requirements are capped.

For a metal building buyer, that makes an apartment above or beside a detached shop, garage or RV building a permitted use in most single-family neighborhoods, not a zoning fight. It still needs a building permit, and it becomes a dwelling unit, with everything that brings. The shop-house build shows how the shop and living halves are typically laid out, and steel barndominium plans covers the full-residence version.

Septic is the real limit

Zoning no longer blocks the apartment. The septic system often does.

On a lot without town sewer, the state septic code, Title 5, sizes a system at 110 gallons per day per bedroom, with a 330 gallon-per-day minimum for a single-family home. State guidance on ADUs is direct: adding a detached ADU will "increase the design flow across the facility," so the existing system "will need to be inspected." In nitrogen-sensitive areas, such as some drinking-water protection zones, total flow on a lot is capped at 440 gallons per day per acre.

Before designing bedrooms into a metal building, find out how many bedrooms your septic system is approved for. That number, not the building, often decides how much living space the project can have. Talk to your board of health at the same time you talk to your building department.

The house itself is governed by the residential code and your town's energy code. Steel framing needs its insulation designed carefully to avoid thermal bridging and condensation; condensation in metal buildings covers the assemblies that work. Steel house construction covers the broader category.

Foundations and the 48-Inch Frost Line

Massachusetts sets one frost depth statewide. The residential code's climate table lists frost line depth as:

"48 inches. For frost protected shallow foundations, see R403.3."

Forty-eight inches is deeper than most of the country, and it lands hardest on a steel building's perimeter footing. A 40x60 has 200 linear feet of perimeter, and the difference between a 36-inch and a 48-inch footing over that run is a real quantity of excavation and concrete. A quote built from a national average will often understate it.

Frost-protected shallow foundations, which use rigid insulation to allow a shallower footing, are recognized in the code as an alternative. They have to be engineered for whether the building is heated, so raise it with your engineer rather than assuming it applies.

New England ledge is the other common surprise. Bedrock close to the surface in many parts of the state can turn a standard excavation into rock removal. A test pit before you finalize the foundation price is cheap insurance. Concrete under a steel frame covers slab and footing options and how the anchor bolt pattern is set.

Popular Uses for Steel Buildings in Massachusetts

Equipment and agricultural storage on farms and larger rural lots, where clear span keeps tractors and equipment moving without columns in the way.

Equine. Indoor riding is close to essential through a New England winter, and a clear-span building is what makes an arena usable. Horse barn layouts covers widths, stalls and ventilation.

Boat and RV storage. Seasonal storage demand is strong along the coast and around the lakes, and door height rather than floor area usually drives the design. RV storage options walks through the eave heights common coaches and boats need.

Warehouse and light industrial. A column-free interior suits contractors' yards, small manufacturers and distribution and storage space. Most standalone business buildings of this kind will be over 35,000 cubic feet, so plan for construction control from the start.

Recreation. A long indoor season makes sports facility construction a strong use case for training centers, turf buildings and courts.

Aviation. General aviation fields across the state support hangar demand, where door width and clear span matter more than anything else. Aircraft hangars and doors covers the door systems.

If none of those fit, what else is available covers the full range of sizes, including the 30x40 and 40x60 footprints most buyers start with.

One caution for a state with 60 psf snow towns: discounted "unclaimed" or surplus building offers deserve scrutiny, because a frame engineered for another state's snow load cannot simply be relabeled for Fitchburg or the Berkshires. The discount, honestly explains how those offers work.

Massachusetts Metal Building FAQ

Compare Massachusetts Steel Building Prices & Save

Two answers decide a Massachusetts project before any price is worth comparing: your site's design loads, and whether anything sits between you and the building permit. The first is your town's row in Table 1604.11, adjusted for elevation if your town carries that footnote. The second is the wetland picture on your lot and, if the building will have living space, the septic capacity and your town's energy code.

With those settled, comparing quotes becomes straightforward, and it is worth doing. Suppliers price the same specification differently, and the spread is wider than most buyers expect. Get pricing from manufacturers against a specification that names the town, the site elevation and the risk category, and the differences will show up in the numbers instead of in the fine print later.

Building somewhere else, or comparing across state lines? The state guides index covers the code, permit and pricing picture for every state we have written up.

Code editions, design loads, and permitting requirements change, and local rules vary by city and town. Verify current requirements with your building department and conservation commission before finalizing a design. Last reviewed September 2026.

Get Your Free Quote

Answer a few quick questions and we'll match you with suppliers who quote your exact size and location. Takes about two minutes.

14,068 kits sold • 50-year structural warranty • Free, no obligation