Updated: May 22, 2026
Location and Projects
Address
111 Washburn Street, Northborough, MA, 01532
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SL Mario Construction Corp
S.L. Mario Construction Corp., led by owner-operator Scott Mario, specializes in high-end residential renovations and restorations, with a particular focus on turn-of-the-century homes. Founded in 1993, the company has developed a reputation for tackling logistically challenging and complex remodeling projects throughout the Northborough, Massachusetts area. Scott Mario brings decades of experience to each project, drawing on a background that began with hands-on work for his family’s construction business before starting his own firm. S.L. Mario Construction frequently collaborates with homeowners, designers, and tradespeople, handling both renovations and intricate restoration work. The company is recognized for managing the unique demands and sensitivities of older homes, preserving character while updating interior spaces to meet modern needs.
SL Mario Construction Corp Services
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SL Mario Construction Corp Contact Information
Phone Number: (617) 719-9626
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Address: 111 Washburn Street, Northborough, MA 01532
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SL Mario Construction Corp Northborough
Quality
101
88th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
SL Mario Construction Corp has a BuildZoom score of 101, which places them above 88% of 139,240 contractors in Massachusetts.
Activity
|
2 projects
|
2025 |
|
2 projects
|
2024 |
|
1 project
|
2023 |
Our building permit records indicate that SL Mario Construction Corp has worked on at least
5.0 projects over the past 3 years.
This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.
This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.
Pricing
|
1 project
|
$5k-$20k |
|
1 project
|
$50k-$100k |
|
3 projects
|
$100k-$250k |
|
1 project
|
$250k-$500k |
The typical size of their permits is approximately $163,343. This graph shows the distribution of these job values.
Pro tip:
For more details about their pricing, check out their recent activity to see how much they have charged for different types of work.
Building Permits by SL Mario Construction Corp
This is a sample of this contractor's permits. Click here to access their complete permit history.
Full gut kitchen renovation move laundry to the second floor half bathroom renovation on the 1st floor full gut full bathroom renovation on the 2nd floor. 3 replacement windows in existing openings in dining room. 2 new construction windows kitchen & 1 new construction window in powder room moving to accommodate new floor plan. enclose covered porch and rebuild stairs to meet code. re... see more
Valuation:
$487,580
Permit #:
BP-2025-000111
Status:
complete
Fee:
$6,800
Permit Type:
N/A
Building Type:
N/A
This condo was severely damaged by a water leak. we are repairing all damaged areas including damaged floors walls and electrical fixtures. the bathroom renovation includes a new tiled shower and floor new plumbing and electrical fixtures and reinstalling the vanity and exhaust fan. additional recessed lighting will be added throughout the condo. four new ductless mini splits units wi... see more
Valuation:
$141,211
Permit #:
BP-2023-000440
Status:
complete
Fee:
$2,840
Permit Type:
N/A
Building Type:
N/A
Full bathroom renovation insulate the 3rd floor replace the whole home hvac system. all work to comply with 780 cmr and local bylaws. dust mitigation required during permitted work
Valuation:
$216,113
Permit #:
BP-2024-000951
Status:
complete
Fee:
$5,740
Permit Type:
N/A
Building Type:
N/A
Renovate master bedroom master bathroom and two master closets. demolish and replace all existing finishes within master suite. all work to comply with 780 cmr & brookline by-laws. dust mitigation required during permitted work
Valuation:
$598,752
Permit #:
BP-2021-001665
Status:
complete
Fee:
$8,480
Permit Type:
N/A
Building Type:
Single family dwe...
Remove and replace kitchen countertops and backsplash. replace kitchen sink & faucet. replace radiator. replace electrical devices and fixtures. sand and finish hardwood floors on the 1st floor. replace 3rd floor bathroom flooring & plumbing fixtures. *all work must comply with 780 cmr and brookline zoning by-laws
Valuation:
$90,825
Permit #:
BP-2022-001048
Status:
complete
Fee:
$1,220
Permit Type:
N/A
Building Type:
Two family dwelling
Renovate kitchen 2nd floor hall bathroom and addition master bathroom. replace existing hvac unit. painting hardwood floor finishing. update smoke detectors where required in work area. beam to be assessed after demolish. all work in accordance with approved plans
Valuation:
$430,227
Permit #:
BP-2020-000146
Status:
complete
Fee:
$5,720
Permit Type:
N/A
Building Type:
Single family dwe...
We are replacing 3 exterior doors & 3 transom windows 1 arched exterior door and 6 windows. *all work must be in accordance with 780 cmr and brookline zoning by-laws
Valuation:
$185,474
Permit #:
BP-2024-000679
Status:
complete
Fee:
$3,720
Permit Type:
N/A
Building Type:
N/A
Garage addition *all work must comply with 780 cmr and brookline zoning by-laws
Valuation:
$688,254
Permit #:
BP-2022-001220
Status:
complete
Fee:
$11,980
Permit Type:
N/A
Building Type:
N/A
Kitchen/den remodel - install beams to open floor plan - new window in kitchen/dining room - replace patio door - refinish floors and paint 1st floor - all work in accordance with approved plans
Valuation:
$190,797
Permit #:
BP-2021-000456
Status:
complete
Fee:
$3,100
Permit Type:
N/A
Building Type:
Single family dwe...
Demolish and remove existing concrete basement slab. install layer of crushed stone 6-mil poly and 2 rigid insulation. install pex tubing for future radiant heating. install abs perimeter piping for perimeter drain. pour and finish 4 concrete slab
Valuation:
$76,380
Permit #:
BP-2021-001767
Status:
complete
Fee:
$1,540
Permit Type:
N/A
Building Type:
Single family dwe...
Sister to existing floor joist to strengthen install two (2) lvl beams with associated lally columns to better support existing first floor structure. remove built up wood beam and three lally columns install two flushed framed steel beams to replace existing beam and removal of lally columns. - all work in accordance with approved plans
Valuation:
$36,655
Permit #:
BP-2021-000223
Status:
complete
Fee:
$740
Permit Type:
N/A
Building Type:
Single family dwe...
Remove three (3) existing windows - infill framing siding and finishes to damaged wall - install three (3) new windows - single family house
Valuation:
N/A
Permit #:
A20220452
Status:
issued
Fee:
$87,063
Permit Type:
Residential addit...
Building Type:
N/A
Remove and replace windows at sun porch living room rear and dining room front. replace interior and exterior window trim on windows being replaced. remove and replace base cap and crown moulding at living room and dining room. replace and addition light fixtures at sun porch living room and dining room. remove and replace cast iron radiation at sun porch living room and dining room. ... see more
Valuation:
$204,102
Permit #:
BP-2019-001322
Status:
complete
Fee:
$3,440
Permit Type:
N/A
Building Type:
Single family dwe...
Demolish and reconfigure existing finished basement - all work in accordance with approved plans
Valuation:
$182,521
Permit #:
BP-2021-000750
Status:
complete
Fee:
$2,540
Permit Type:
N/A
Building Type:
Single family dwe...
Remove and replace wood privacy fencing along side rear of property remove and replace decorative fencing along front of property
Valuation:
$36,572
Permit #:
BP-2020-001797
Status:
issued
Fee:
$740
Permit Type:
N/A
Building Type:
Single family dwe...
Renovation of existing 2nd floor bathroom addition master bathroom at 2nd floor. renovate existing 2nd floor bedroom
Valuation:
$153,550
Permit #:
BP-2019-001067
Status:
complete
Fee:
$2,220
Permit Type:
N/A
Building Type:
Two family dwelling
Install 1 mini split head in unit and 1 roof top condenser at approved location. all work must comply with 780 cmr & brookline by-laws
Valuation:
$6,125
Permit #:
BP-2023-001688
Status:
issued
Fee:
$140
Permit Type:
N/A
Building Type:
N/A
Repair and renovate existing first level stairs and landing and 2nd level
Valuation:
$116,670
Permit #:
BLDR-071368-2018
Status:
issued
Fee:
N/A
Permit Type:
Addition alteration
Building Type:
N/A
Remove existing basement plastered ceiling wood storage partitions and shelving. relocate plumbing electrical and hvac as necessary to gain headroom. frame perimeter walls and interior partitions in finished sections of basement to create a playroom exercise area storage and bathroom. replace two gas fired furnaces with high efficient equipment. finish basement by right. all work in a... see more
Valuation:
$178,929
Permit #:
BP-2020-001319
Status:
complete
Fee:
$2,240
Permit Type:
N/A
Building Type:
Single family dwe...
Complete full renovation of full bathroom on second floor 1/2 bathroom on first floor partial renovation of full bathroom on third floor and shower renovation at master bathroom. replace kitchen flooring range and exhaust hood. relocate closet at 2nd floor bedroom sand flooring and paint 2nd floor bedroom. replace rear stairwell window
Valuation:
$230,687
Permit #:
BP-2018-001074
Status:
complete
Fee:
$3,500
Permit Type:
N/A
Building Type:
N/A
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SL Mario Construction Corp Reviews
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Verified License
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SL Mario Construction Corp License info
Verified License
| License # | 172408 |
| Status | Active |
| State | Massachusetts |
| Type | Home Improvement Contractor |
| Date Issued | 06-21-2026 |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for SL Mario Construction Corp at the Mass.gov Consumer Affairs and Business Regulation.
This is a sample of licensing data; click here to access a complete history.
101
BuildZoom Score
21
Permits
- Building permit records show that SL Mario Construction Corp has worked on 21 permitted projects.
SL Mario Construction Corp Employees
SM
Scott L Mario
President
SM
Scott Mario
Owner