An existing building already has a structure, a roof, a service entrance and usually a certificate of occupancy. The permit scope narrows to what you change, production starts months earlier, and the commitment is smaller. A few things have to be settled before you sign.
Three things to check before signing
Incoming electrical service capacity. A distribution warehouse is served for lighting and a few dock levellers. A plant is not. An upgrade puts you back in the utility's queue — usually longer than the construction.
Sprinkler density versus your commodity. A system designed for the previous use may not suit what you intend to store or make, and the remedy can be an entirely new system including the water supply.
Whether the occupancy classification changes. Warehouse to manufacturing, or introducing hazardous materials, can change fire separation, egress, construction type and sprinkler design. The paint-and-partitions job becomes a structural one.
Eight checks before you sign
All cheap to check and ruinous to discover late. We can put this in writing before you commit:
- Incoming electrical service capacity — the most common deal-breaker.
- Clear height and column grid — fixed, and they decide whether the line fits.
- Slab thickness, loading and flatness — machine bases, AGVs and racking all care.
- Fire protection density against your commodity classification.
- Roof age and capacity — new rooftop units, exhaust and make-up air all land on it.
- Dock versus grade access for equipment arriving after the walls close.
- Whether the parcel next door is actually buildable — easements, setbacks, wetlands, detention and zoning.
- The existing certificate of occupancy and drawing record, which sets where permitting starts.
Altering is a different permit path
Work on an existing building is reviewed under the existing-building provisions your jurisdiction adopted, scaled to how much you change. Two things escalate fast.
Change of occupancy is the trap. It can change fire separation, egress, construction type and sprinkler design at once. Settle the classification with the architect and the AHJ at the very start — it is one of the few decisions that is genuinely hard to unwind.
A federal obligation also attaches. Under 28 CFR 36.403, altering an area containing a primary function requires the path of travel to be made accessible, up to 20% of the cost of that alteration. It cannot be avoided by phasing — the regulation expressly blocks splitting work into a series of small alterations, and costs on the same path of travel within the preceding three years are aggregated into the calculation. Phasing does not reset the clock; it raises the base.
Six things phase 1 must do for phase 2
Each costs a little now and a great deal later. This is the actual content of a phased strategy:
- Size stormwater detention for the ultimate build-out — detention sized for phase 1 has to be rebuilt, and it usually sits exactly where you want to build.
- Size the electrical service for the ultimate load — a second upgrade means a second trip through the utility queue at phase 2 prices.
- Check fire water supply and riser capacity against the final building area.
- Decide where the tie-in happens and leave that wall soft — which bay opens, where the expansion joint sits, how roof drainage reconciles, whether the frame takes the new load path.
- Keep permanent things out of the phase 2 footprint — yards, docks, parking, detention, the transformer pad and underground utilities.
- Get site plan and zoning approval for the master plan, not just phase 1.
Draw the phase 2 footprint before finalising phase 1 civil works, even if it is three years away and the dimensions are a guess. A guessed footprint in the right place beats no footprint.
Building beside a plant that is running
By phase 2 the site is a live manufacturing operation, and production continuity — not construction efficiency — governs the programme.
- Separate construction access and laydown from plant traffic, ideally a separate gate.
- Protect the running operation from dust, vibration and water, especially when breaking through an existing wall.
- Plan tie-in shutdowns as scheduled events agreed with the plant manager months ahead.
- Maintain temporary utilities and fire protection throughout — a phase 2 trench can cut a phase 1 service.
- Agree the safety interface: badging, permits to work, who stops whom.
Price it honestly. Building beside a running plant costs more per square metre than greenfield, and a contractor who has not priced the disruption will find it later, in change orders.
What we bring
CTECP has delivered plant expansions, brownfield conversions and fit-outs alongside greenfield work, and operates in the United States through CTECP INC — Houston, Dallas and Greenville, South Carolina.
On a phased programme we would rather be involved before the building is signed than after. The decisions that determine what phase 2 costs are nearly all made before phase 1 breaks ground, and most of them are free at that point.
Frequently asked questions
Is retrofitting an existing US building cheaper than building new?
Usually for a first facility — the structure, roof and service entrance exist and the permit scope is narrower. The saving disappears if the incoming service has to be upgraded, the sprinkler system does not suit your commodity, or the occupancy classification changes. Check those three before signing.
What accessibility obligations does a renovation trigger?
Under 28 CFR 36.403, altering an area containing a primary function requires the path of travel to that area to be made accessible, up to 20% of the cost of the primary-function alteration. The obligation cannot be avoided by splitting work into small alterations, and alterations to the same path of travel in the preceding three years are aggregated.
What should phase 1 do differently if we will expand later?
Size detention and the electrical service for the ultimate build-out, check fire water and riser capacity against the final area, decide the structural tie-in, keep yards and utilities out of the future footprint, and get site plan approval for the master plan.
Can you expand while the plant keeps running?
Yes, and it is normal — but production continuity governs the schedule. It needs separate construction access, dust and vibration control, scheduled tie-in shutdowns agreed with the plant manager, and a priced allowance for disruption.
Can you do only the production line installation?
Yes — equipment foundations, process piping, utility connections and equipment approval coordination can be taken on separately.
How do we start?
Send the building and the parcel you are looking at: address, area, clear height, existing service capacity if known, and your line requirements. Written opinion within two business days, at no cost.