PlumbingCode Explainer··10 min readUPDATED
Gas Line Installation in MA: 248 CMR + Plumbing Permit Reality
What 248 CMR requires, who can pull the permit, the pressure-test protocol, and the line between utility-side and plumber-side gas work in MA.
Format · Code Explainer
Code Explainer Articles.
What 780 CMR, 248 CMR, 527 CMR, and ASHRAE codes actually require — by scope of work, by city, with the permit fees and inspection sequences.
9 articles published in this format · updated weekly.
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Every Code Explainer Article.
Sorted newest first. Each article links downstream to the relevant Pro Build service pages and to other articles in the same cluster.
ADU in Massachusetts: MGL c. 40A §3A Reality + Real Build Costs
What MGL c. 40A §3A allows as-of-right, what local zoning still controls, and real build costs by path — interior conversion to detached new build.
13 min readRead →
Massachusetts Snow Load: Complete ASCE 7 Structural Engineering Guide
MA 50 PSF ground snow load explained — ASCE 7-22 calculation, design roof snow load, regional variations, framing implications.
9 min readRead →
Window Replacement in MA Stretch Code: U-Factor 0.27 and the Cost Jump
What MA stretch code requires, the cost jump from U-0.30 to U-0.27 to U-0.22, and the Mass Save Energy Star window rebate path.
10 min readRead →
Bathroom Remodel Permits in MA: When 780 CMR Triggers (and When It Doesn't)
Cosmetic vs structural vs plumbing-relocation scopes — and the 780 CMR / 248 CMR / 527 CMR lines that decide when a permit is mandatory.
11 min readRead →
Boston Brownstone Renovation: Complete Historic District Compliance Guide
Beacon Hill, Back Bay, South End historic district rules — what triggers Landmarks Commission approval, what doesn't, common workarounds.
10 min readRead →
What Is the Massachusetts ADU Law? MGL c. 40A §3A Complete Guide
MGL c. 40A §3A explained: as-of-right ADU zoning, dimensional limits, owner-occupancy, STR rules, parking — all statewide.
10 min readRead →
What Is NEC Article 220? Complete Massachusetts Load Calculation Guide
Complete reference: NEC Article 220 dwelling unit load calc. Demand factors, when required, the math behind 200A vs 400A panel sizing.
10 min readRead →
Massachusetts Stretch Energy Code: Complete Town-by-Town Adoption Map
Which MA towns adopted stretch code vs specialized stretch — with U-factor, insulation, and ACH-50 requirements per tier.
9 min readRead →
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