Quick answer: House raising lifts your entire home — walls, roof, and floor framing together as one rigid unit — off its current foundation so a new, higher one can be built underneath. In Charleston the work runs in a set sequence: engineering and an elevation certificate set the target height, permits are filed, the house is disconnected and cradled on steel beams, a synchronized hydraulic system raises it a fraction of an inch at a time onto timber cribbing, a new foundation is built, and the home is set down and reconnected. The physical lift takes only days; the full project usually runs three to four months, most of it engineering, permitting, and foundation work.
Before Anyone Touches the House: Assessment & Engineering
Every raise starts on paper. A structural assessment confirms the home can be lifted and how, an elevation certificate establishes where the finished floor sits today, and a licensed engineer sets the target height — your zone’s Base Flood Elevation plus your jurisdiction’s freeboard. That target is the whole point of the project: it’s the number your flood-insurance rating and your flood zone rules are built around. The output of this phase is a lift design and a fixed written quote, so there are no moving numbers once the steel arrives.
Permits and the FEMA Paperwork
Nothing gets jacked without a permit. County and municipal building permits are filed for you, along with any FEMA and grant documentation — the same paperwork that unlocks ICC coverage and mitigation grants if your home qualifies. This is routinely the slowest stretch of the calendar, because it runs at the permit office’s pace rather than the crew’s, and on the peninsula it can also mean Board of Architectural Review sign-off for a historic home.
Preparing the Site and Disconnecting the House
Once permits are in hand, the house is made ready to move. Water, power, gas, and sewer are disconnected; skirting, steps, and attached decks come off; and the crew opens access to the foundation so beams can be threaded beneath the structure. From this point the home is vacant — there are no live utilities while it’s in motion.
The Synchronized Hydraulic Lift
This is the part people picture, and it’s calmer than it sounds. Steel I-beams — “needle beams” — are threaded through the foundation to build a rigid steel cradle that carries the full weight of the home. A unified hydraulic jacking system runs every jack off one central pump and valve manifold, so all lift points receive the same pressure and rise at the same rate — typically less than an inch per stroke. Because the entire house climbs together, drywall doesn’t crack, brick doesn’t split, and door frames stay square.
Cribbing: How the House Stays Safe Between Strokes
The house never hangs on the jacks. Between strokes, the crew builds box cribbing — interlocking timber towers stacked at right angles — to hold the load while the beams and jacks are reset for the next lift. The home rises a few inches, transfers its weight onto fresh cribbing, and the cycle repeats until it reaches the engineered height. On a typical Lowcountry home the physical raising takes only a few days.
The New Foundation, Set-Down, and Reconnection
With the house held at height, the new foundation goes in beneath it — code-compliant piers, a stem-wall crawlspace, or, in velocity zones, an open piling system built for wave action. When the foundation cures, the home is lowered onto it in the same controlled, synchronized way it went up. Utilities are reconnected, steps and skirting are rebuilt, and the site is restored.
The Final Inspection and Your Elevation Certificate
The jurisdiction inspects the finished work, and a surveyor issues a post-lift elevation certificate documenting the new finished-floor height. That certificate is what proves compliance and what your insurer uses to re-rate the policy — the paperwork payoff for the whole project.
How Long the Whole Thing Takes
Homeowners are often surprised that the lift is the fast part. Assessment and engineering run a week or two; permits and FEMA paperwork are commonly four to eight weeks; the lift itself is days to a week or two; and the new foundation adds another four to eight weeks. Sequenced end to end, most Charleston projects land in the three-to-four-month range — and much of the bill is frequently offset by grants and ICC coverage, which a free assessment quantifies for your address, zone, and target height.
This is a general description of the structural house-raising process; the exact sequence, durations, and foundation type depend on your home, its starting foundation, and your jurisdiction. For a plan and a fixed quote specific to your address, call (843) 666-8360 for a free elevation assessment.