
Abacus
Abacus
Abacus Builders is a Boston general contractor focused on ground-up development and full-gut remodeling. It also restores building envelopes and investigates leak sources, serving the Boston Metro and MetroWest. Mark Little started the company in 2006.
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Business Highlights
- The company is fully licensed and insured in Boston.
- The envelope-restoration crew is on payroll, and the same crew handles diagnosis and repairs.
Service Area
Boston Metro and MetroWest.
Active Business Listing
Abacus is one of 12 renovation contractors ProsGrade lists in Boston, Massachusetts.
12 services listed, including Ground-up new construction, Full-gut renovations and Fire and water damage restoration. Open weekdays, closed on weekends. 83 reviews.
- Verified listing details
- Service information
- Customer review signals
- Photo gallery
- Public contact information
- Published local profile
How This Business Compares
How Abacus compares with the other 11 renovation contractors on ProsGrade in Boston, using public Google ratings and review counts.
- Ranks in the top half of the 12 Boston renovation contractors on ProsGrade by Google rating and review volume.
- Has more Google reviews (83) than 10 of the 11 other Boston renovation contractors on ProsGrade.
Services Covered
12 services- Ground-up new constructionMultifamily home building
- Full-gut renovationsTriple-decker remodeling
- Fire and water damage restoration
- Roof decks and porches
- Roofing, siding and masonry
- Planning and permittingBoston ISD permit applications
- Window and door flashing / building-envelope repairDirecting water away, protecting framing and addressing hidden moisture issues
- Historic masonry and repointingDeteriorated mortar joints; appropriate materials and techniques for older structures
- Exterior facade and siding restorationCommercial and residential buildings
- Commercial waterproofingBuilding envelopes, foundations, facades, decks and other vulnerable areas
- Roof and balcony waterproofingProperly pitched surfaces, waterproofing membranes and EPDM rubber roof replacement when required for deck and balcony projects
- Building-envelope leak investigationEvaluation of exterior walls, windows, doors, roofs, balconies and masonry
Reviews
What customers say
Customers praise clear communication and respectful crews; two reviewers also say project timelines were met. A bathroom-remodel customer says the team minimized disruption because it was the customer's only bathroom, while a condo-board reviewer says the team helped explain change orders and complete the project within budget.
Customer Reviews
Victoria G.
Kelly Kenneally
Tristan Rock
John Maggio
Deirdre Fenick
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Frequently Asked Questions
How long can Boston permitting take?
Short-form permits are typically reviewed and approved within 24–48 hours; long-form permits for projects without zoning violations may be issued within 2–4 weeks from submission. Zoning Board of Appeals cases can take 3–12 months.
What permitting work does Abacus handle?
It coordinates with architects, engineers and attorneys, can lead abutters meetings and manage Zoning Board of Appeals appeals, and manages inspection timelines and final sign-offs.
How does Abacus handle fire or flood restoration?
It works with the property owner and insurer to secure the property, then identifies and estimates structural damage.










