Second Story Additions in Haddonfield, NJ
Double your living space without giving up your lot. MAG Development designs, engineers and builds second story additions across Haddonfield — foundation evaluation, structural drawings, borough approval and construction handled as one scope.
What a Second Story Addition Costs in Haddonfield
Second story additions in Haddonfield generally run $300–$500 per square foot. The range sits above a rear extension because building up is never only about the new floor — it means evaluating the foundation, reframing load paths, cutting in a new staircase and rebuilding the roof.
A partial second story over part of the footprint typically runs $150,000–$250,000. A full second story lands around $200,000–$320,000, rising to $300,000–$400,000 when it includes a primary suite, and $380,000–$450,000+ when the first floor is reconfigured at the same time.
Full figures and what sits behind them are in our second story addition cost guide.
Types of Second Story Additions We Build in Haddonfield
Partial Second Story
A new floor over part of the house — often above a garage or a rear wing. Less structural work than a full build-up and the most common first step on a Haddonfield cape or ranch.
Full Second Story
The roof comes off and a complete floor goes on, usually three to four bedrooms and two baths. The largest gain in usable space available without touching your footprint.
Second Story With Primary Suite
A proper owner’s suite with a spa bath and walk-in closet — the room most original Haddonfield floor plans never had. See primary suite addition cost.
Build-Up With First-Floor Reconfiguration
Adding the floor above while opening the kitchen and living space below. More disruptive and more expensive, but it resolves the whole house in one permit and one crew.
Building Up in Haddonfield’s Historic District
Haddonfield is one of the oldest boroughs in South Jersey, and a large share of its housing stock predates anything resembling a modern building code. That is exactly why people buy here, and it is also why a second story is a more involved project in this borough than in a 1990s subdivision.
Exterior work within the historic district is reviewed, and a second story is about as exterior as a project gets — it changes the roofline, the massing and the way the house reads from the street. We plan for that review as part of the schedule rather than discovering it after drawings are done, and we design the new floor to match the original proportions: window sizes and spacing, cornice lines, siding or shingle coursing, and a roof pitch that belongs to the house.
Structurally, older Haddonfield homes need honest evaluation before anyone commits. Adding a floor roughly doubles what the foundation and first-floor framing carry, and original joists, bearing walls and footings were not sized for it. We answer that question first, not last.
How a Haddonfield Second Story Addition Works, Step by Step
Consultation & structural read
We walk the house and give an honest assessment of whether the existing foundation and framing can carry a second floor, and what it would take if they cannot.
Design & engineering
Architectural drawings, structural calculations, stair placement and a fixed scope — designed to match the original house, not sit on top of it.
Approvals & permits
We prepare the borough package, plan for historic district review where it applies, and manage comments through to approval.
Build
The roof comes off under controlled conditions and gets dried in fast. One crew, a published schedule, and a walkthrough with final inspection signed off.
Second Story Additions Near Haddonfield
We build second stories throughout Camden and Burlington County and across the Pennsylvania Main Line — see second story additions in Wayne for how the same work runs on that side of the river. If the goal is a suite for family rather than more bedrooms, start with in-law suites in Voorhees. Explore the other towns we work in:
Haddonfield Second Story Addition FAQ
How much does a second story addition cost in Haddonfield?
Most run $300–$500 per square foot. A partial second story typically lands at $150,000–$250,000, a full second story at $200,000–$320,000, a build-up including a primary suite at $300,000–$400,000, and a second story with first-floor reconfiguration at $380,000–$450,000+.
Can my existing foundation support a second story?
That is the first question we answer, not the last. Adding a floor roughly doubles the load on the foundation and first-floor framing. Many Haddonfield homes can carry it with targeted reinforcement; some need more. We evaluate before you commit to a design.
Do I need historic district approval in Haddonfield?
If your home sits within the historic district, exterior changes are reviewed — and a second story changes the roofline and massing, so it is squarely in scope. We build that review into the schedule and design the addition to match the original proportions rather than fighting the process.
Can we live in the house during a second story addition?
Generally not for the whole build. Once the roof is opened the house is exposed until it is dried in, so most families move out for that phase. We give you a realistic window for it up front rather than a best case.
How long does a second story addition take?
Plan on three to five months of design, engineering and approvals before construction, then roughly five to eight months of building. Historic district review can extend the front end, which is why we start it early.
Is it cheaper to build up or build out?
Per square foot, building out is usually less expensive because it does not disturb the existing structure. Building up wins when lot coverage is maxed, the yard is worth keeping, or you need bedrooms rather than living space — which in Haddonfield is often the case.