House Lifting 101

The basics

Your house doesn't move. The ground under it does.

A structural house lift raises an existing home — intact, as one piece — off its original foundation, holds it in the air on a temporary support system, and lets crews build a taller foundation underneath before setting the house back down. Most homeowners do this for one of a few reasons: a new flood-zone elevation requirement, a lower level that floods, or simply wanting the extra square footage a raised foundation creates below the living space.

It sounds more dramatic than it is. The whole sequence — disconnect, lift, rebuild, lower — is engineered and permitted like any other structural project, with the same building department, the same inspectors, and the same paper trail as new construction.

The same house at three stages: on its original foundation, suspended on cribbing and jacks while the old foundation is demolished, then resting on a new, taller foundation.

temporary support (cribbing & hydraulic jacks) new permanent foundation

The lift itself is done with a unified hydraulic jacking system — dozens of jacks tied together and controlled as one system, so the house rises evenly instead of racking or twisting. As it climbs, crews build cribbing towers (stacked wood or steel blocking) underneath to physically hold the weight at each new height, the way you'd block up a car on stands rather than trust the jack alone. An engineer designs the shoring and jacking plan before any of it touches your house, and that plan gets a formal sign-off before jacking begins — the first of several hold points covered below.

The sequence

Nine phases, start to finish

Every lift follows the same order of operations. Durations vary by house size, foundation type, and how the local permitting office is running that month — but the sequence itself doesn't change.

Long-lead procurement

Before permits even close out

Structural steel beams and specialty items like flood vents have real lead times, so they're ordered as soon as engineering is finalized — often weeks before a crew ever sets foot on site.

Permitting

Permit issued · Notice of Commencement recorded

Nothing structural happens until the permit is issued and, where required, a Notice of Commencement is recorded. This is the gate that opens every phase after it.

◆ Milestone

Mobilization & site prep

Crew arrives · site is secured

Crew and equipment move in. Erosion control fencing goes up, temporary power and water are established for the jobsite, and a surveyor documents the home's existing elevation for the record — the "before" baseline everything else gets measured against.

⚑ Erosion control inspection ⚑ Temporary power inspection ◆ Elevation certificate (before)

House prep for elevation

Utilities disconnected · shoring installed

Electrical and plumbing are disconnected at the structure, and the house is physically freed from its existing foundation. Cribbing towers and the jacking system go in next — sized and placed to the engineer's shoring plan.

⛔ Hold point — engineer sign-off before jacking

House elevation

The lift itself

The house is jacked up in small, controlled increments to its designed height, with cribbing locked in behind it at each stage. This is the part everyone pictures — and it's usually the fastest phase, measured in days, not weeks.

⛔ Hold point — inspector verifies lift height & shoring ◆ Milestone — house elevated

Geotechnical groundwork

Soil prep beneath the house

With the house safely in the air, the footprint underneath is cleared, the subgrade is compacted and tested, and footing excavations are cut to the geotechnical engineer's specifications.

⚑ Compaction observation ⚑ Excavation observation

New foundation, steel & block

The longest phase

This is where the new foundation actually gets built: footings poured, permanent steel beams set, block walls raised, a new elevated slab poured, rough electrical run, and flood vents installed. Then — carefully — the house is lowered onto its new foundation and the cribbing comes out.

⚑ Footing, steel, masonry & slab inspections ⚑ Rough electrical inspection ⚑ Flood vent inspection ◆ Milestone — block work complete

Envelope, stucco & finishes

Weatherproofing & energy code

The new foundation gets sealed, insulated, and stuccoed. Concrete decks and stair landings are formed and poured. Before anything's closed up, the home goes through the same energy-code testing — air leakage and, where applicable, duct leakage — required of new construction.

⚑ Air barrier & insulation inspection ⚑ Blower-door & duct leakage tests ◆ Elevation certificate (after)

Closeout

Final walkthrough · final inspections

A final walkthrough with the homeowner, a building final covering the contracted structural scope, and a floodplain compliance review comparing the new elevation certificate against the flood map requirement. Once those pass, the contracted scope is complete.

⚑ Building final ⚑ Floodplain compliance final ◆ Milestone — scope complete

Inspections & hold points

What a "hold point" actually means

A hold point is a spot in the schedule where the contract and the building code both say the same thing: work legally cannot continue until a qualified person looks at it and signs off. It isn't a delay — it's the mechanism that keeps a lift safe. Most hold points exist because the next step would bury or conceal something (steel in a wall, rebar in a slab) that has to be checked while it's still visible.

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Rule of thumb: if a task would hide or cover something structural — reinforcing steel, a beam connection, cribbing under load — expect a hold point right before it. The crew stages the work and waits; nothing gets covered up uninspected.

Structural engineer of record

Shoring & steel

Cribbing & jacking plan sign-off before the lift begins
Steel beam placement, before it's built over

Geotechnical engineer

Soil & footings

Subgrade compaction observation
Footing excavation observation
Helical pile monitoring, if supplemental piles are used

City building inspector

Code compliance

Lift height & shoring verification
Footing, masonry, slab & rough electrical
Flood vent installation
Building final

Energy code inspector

Efficiency & envelope

Air barrier & insulation
Blower-door leakage test
Duct leakage test, when ductwork is disturbed

Surveyor / floodplain administrator

Elevation & flood compliance

Elevation certificate — before construction
Elevation certificate — after construction
Floodplain compliance final review

Local jurisdiction

Site & utilities

Erosion & sediment control, before land disturbance
Temporary electrical service, before it's energized

A hold point sits between two tasks: nothing on the far side of it starts until the inspector on that item has signed off.

Field conditions

Why your schedule might shift

A printed schedule shows the order work happens in — it isn't a guarantee of exact dates. Once a crew starts digging under a decades-old house, a handful of things turn up often enough that they're closer to routine than exceptional. None of them mean the project has gone wrong.

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Weather & rain

Affects · geotechnical & concrete work

Soil has to be within a certain moisture range to compact and test correctly, and fresh concrete needs a dry cure window. A few rainy days don't just cost those days — wet subgrade often needs time to dry out before proofrolling, compaction testing, or a footing pour can resume, which can ripple into a week or more on the geotechnical and foundation phases.

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Conditions found while digging

Affects · groundwork & footings

Utility locates and geotechnical borings sample the ground — they don't guarantee what a full excavation will find. Old septic or cesspool remnants, buried debris, unsuitable fill soil, or higher groundwater than expected are all things that occasionally surface once footings are actually cut. When they do, the geotechnical engineer typically re-assesses before work continues — an inspection that wasn't on the original schedule because the condition wasn't known yet.

⌁

Utility changes

Affects · site prep & foundation layout

A water, sewer, or power line running exactly where a new footing or block wall needs to go isn't always obvious until the ground is open. Rerouting or protecting it in place is usually straightforward, but it's real time added at a point when the house is already elevated and the foundation crew is waiting to move forward.

⚙

Extra checks as beams and cribbing go in

Affects · house elevation

Beyond the two lift-related hold points already on the schedule, crews typically re-verify cribbing and jack settings every time the house climbs another increment, not only at the final height — and taller or unevenly loaded lifts mean more of these in-progress checks. As permanent steel beams are set, each new beam connection is generally confirmed against the engineer's drawings before the next one goes in, rather than all at once at the end.

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Wall & framing modifications

Affects · new foundation & block work

Once block, framing, or subfloor is opened up, it's common to find rot, damage, or a wall that wasn't built quite the way the original plans show. Sistering a joist, adding blocking, or reinforcing a wall are frequent enough to be routine — but since they weren't in the original scope, they usually mean a short pause while the engineer signs off on the fix and, occasionally, a change order.

✎

Plan & permit revisions

Affects · any inspected phase

An inspector can ask for something the original permit set didn't spell out in detail — an added flood vent, a different tie-down, extra reinforcement. When that happens, the change typically has to go back through the engineer of record, and sometimes back to the building department, before work continues on that specific item.

The short version: hold points and inspections exist because these things happen. A schedule slipping by a few days after a rainy week or an unexpected utility line isn't a sign the project is off track — it's the process catching a real-world condition and dealing with it before it becomes a bigger problem.

What you'll actually see

Five milestones to watch for

Inspections happen constantly in the background, but these are the visible turning points — the moments where the project obviously looks different than it did the week before.

Mobilized

Crew & equipment on site, work underway

Ready to lift

House prepped, shoring approved

Elevated

House at full height, cribbing locked

Block complete

New foundation built, house lowered

Scope complete

Finishes done, final inspections passed

Questions homeowners actually ask

Common questions

Can I stay in the house during the lift?+

No. Utilities are disconnected before the house is detached from its foundation, and the home is unoccupied from that point through the lift and the new foundation work. Most homeowners relocate for the structural phases and can typically move back once utilities are reconnected and finishes are complete.

Will lifting the house crack the walls or damage the interior?+

The whole point of the unified jacking system and engineer-designed cribbing plan is to raise the structure evenly, so it isn't twisting or racking as it goes up. Some cosmetic settling — hairline drywall cracks, a door that needs re-adjusting — is common after any structure is lifted and reset, the same as it would be after any major structural work. Significant structural cracking is exactly what the engineer's shoring plan and the hold-point inspections are designed to prevent.

What happens if an inspection doesn't pass?+

The hold point simply doesn't release. Work on that item stops, the issue gets corrected, and the inspector comes back to re-check it before the crew moves on. It adds time to that specific task, but it's a normal part of the process — not a sign anything has gone wrong with the project overall.

What is an "Elevation Certificate," and why are there two?+

An Elevation Certificate is a surveyed document that records the exact height of your home's lowest floor relative to sea level and the local flood map. The "before" certificate establishes the starting point; the "after" certificate — issued once the new foundation and floor are in place — proves the home now sits at or above the required elevation. Insurance companies and the floodplain administrator both rely on this document.

Why does the house end up on a taller, thicker foundation than before?+

The new foundation isn't just taller for the sake of height — it's engineered from scratch to current code, sized to the geotechnical report for your specific soil, and built with flood vents that let water pass through the enclosed lower level in a flood instead of trapping it against the walls. It's a new structural system, not just a taller version of the old one.

Who are all these inspectors, and do I need to be there for them?+

Across the project you'll see the city building inspector, the structural engineer of record, a geotechnical engineer, and an energy-code inspector, plus a surveyor for the elevation certificates. Your contractor coordinates and is present for all of them — homeowner attendance generally isn't required, though you're welcome to ask your project manager when a particular inspection is scheduled if you'd like to be there.

How long does the whole process take?+

It varies with house size, foundation type, and how quickly the local permitting office moves — but as a rough shape: long-lead material orders and permitting happen first (often several weeks, partly in parallel), the physical lift itself is one of the shortest phases (days), and the new foundation, block work, and finishes make up the bulk of the schedule. Your project manager can walk you through the specific schedule for your home.