Residential · Additions

Home Additions in New Jersey

When you need more space but love your location, an addition is often the smartest move.

We build rear and side additions, second-story additions and garages that match your home’s roofline, siding and interior finishes — and we manage the permits, inspections and trades from foundation to final paint.

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NJ HIC Reg. #13VH13917100 · Registered & insured

Completed detached garage with new vinyl siding

8–16 wks

Typical standard addition

$35k+

Starting total, incl. materials

Permits

Zoning & building handled

Why choose Dong Sheng

Architectural harmony

Additions are designed to match your existing roofline, siding and trim so they look original to the house.

Permit & code expertise

We coordinate drawings, zoning and building permits, and schedule every inspection.

Minimal disruption

We keep the site organized and the lived-in parts of your home protected throughout construction.

What’s included

  • Rear and side room additions (bedrooms, bathrooms, offices)
  • Second-story additions
  • Garages and detached structures
  • Kitchen expansions and layout changes
  • Foundations, structural beams and new garage openings

How your project runs

  1. Consultation & site visit

    We visit, measure, look at existing conditions and talk through goals, budget and timing.

  2. Design & written scope

    We coordinate drawings with an architect (or build from yours), confirm zoning, and deliver a written scope with a clear price.

  3. Permits & build

    We file permits, then handle foundation, framing, roofing, rough-ins, inspections, siding and interior finishes with regular updates.

  4. Final walkthrough

    We review every detail with you and close out the punch list before handover.

Real photos and videos from our job sites. Open one to enlarge it, then swipe or use the arrows to browse the rest.

Completed detached garage with new vinyl siding
Rear addition framed and sheathed, with window openings cut
Rear addition finished with vinyl siding and new windows
Crew framing the walls and roof of a rear addition
Rear home addition wrapped and ready for siding
Addition framing walkthrough video
Garage addition under construction with house wrap and siding
Addition wall framing being raised, job-site video
Second-floor addition framing video
Worker beside a newly sheathed addition wall
Foundation excavation for a rear addition next to the house
Footing trench with rebar ready for concrete
Concrete slab poured for a new addition
Crew setting a beam on the new addition foundation, job-site video
Addition wall framing going up, with framing lumber staged on site
Attic and roof framing video for a home addition
Crew working on the exterior of a home addition
Wood framing and roof trusses of a new structure
Side view of new wood framing with roof sheathing underway
Home addition construction continuing through winter
New window openings framed in a home addition
New ceiling joists inside an addition before drywall
Garage opening reframed with a new header beam
Raising a new structural beam into place with a material lift
New structural beam raised with a lift, job-site video
Interior framing with new drain lines roughed in below the floor
Siding installation on a detached garage addition
Addition subfloor and framing progress video

Budget & timeline reference

Minor structural upgrade

Total (incl. materials) $35k – $80k

Timeline 4 – 8 weeks

Standard addition

Total (incl. materials) $80k – $180k

Timeline 8 – 16 weeks

Full renovation + addition

Total (incl. materials) $180k+

Timeline 16 – 28 weeks

Ranges are planning references. Final pricing depends on permit scope, structural conditions and finish level. Registered & insured New Jersey home improvement contractor · NJ HIC Reg. #13VH13917100

Frequently asked questions

Most projects start 2–6 weeks after scope confirmation and permit submission; town review times vary.

Most additions require stamped drawings for the permit. We can coordinate an architect for you or build from your architect’s plans.

Yes. We coordinate permits, inspections and documentation as part of every project.

We lock scope early, provide stage approvals, and issue change orders only when they are actually required.

Where we work

  • Bergen County
  • Essex County
  • Passaic County
  • Middlesex County
  • Mercer County

Related services

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