Charleston Home & Room Additions

Charleston Home Addition Transformations

Why Charleston Homeowners Choose Us

Plan the cost around your scope and location

Define the footprint and intended use before comparing estimates. Foundation, structural connections, roof tie-in, utility extensions, finishes and design or permit responsibilities belong in the written scope.

What changes the cost of a kitchen extension in Mount Pleasant?

A kitchen extension enlarges the home's footprint; an interior kitchen remodel changes space already inside it. Compare the proposed added area and the work inside the existing kitchen separately. An interior-remodel budget does not establish the cost of building an extension.

• Building shell and structure: Identify site preparation, foundation, framing, roof connection, exterior walls, windows and doors, plus any structural opening into the existing house.
• Kitchen fit-out: Define cabinets, countertops, appliances, lighting, flooring and the plumbing, electrical and HVAC work needed for the proposed layout. Ask which existing items stay and which are replaced.
• Complete estimate: Ask whether design, engineering, permits, demolition, debris removal and making good adjoining rooms are included. Record finish allowances, exclusions and how concealed conditions or owner changes affect the agreed scope.

For a property within the Town of Mount Pleasant, review the Town's building-permit and plan-submission guidance. Confirm the responsible jurisdiction for your address and the reviews needed for that parcel before settling the design; the Town's planning and zoning guidance is a starting point. Review time varies, so an estimate should identify planning responsibilities without promising a permit date.

If you are keeping the work inside the current footprint, start with Mount Pleasant kitchen remodeling and its scope-specific planning guidance. For an extension, request a written estimate that separates the addition from the kitchen work so you can compare equivalent proposals.

Elevated and second-story additions in a flood zone

On Sullivan’s Island, Isle of Palms, James Island, Johns Island and much of the Charleston peninsula, an addition in a flood zone is judged against the value of the whole house, not just the new room. In unincorporated Charleston County, improvements over any five consecutive years that add up to 49% of the structure’s market value make it a substantial improvement; the City of Charleston uses a 50% threshold. Cross that line and the existing house has to meet the flood standards for new construction, which is how a room addition turns into an elevation project.

• Elevated additions: the new floor is built at the required flood elevation, often on piers or continuous footings, and meets the existing house with steps or a ramp where the floor levels differ.
• Second-story additions: build up instead of out, which keeps the footprint and can keep the living space above flood elevation, but needs an engineer to confirm the existing foundation and framing can carry the load.
• Paperwork that sets the schedule: in unincorporated Charleston County, a flood elevation certificate from a land surveyor is required before the floor strapping and sheathing inspection. Book the surveyor at the start.

Read the City of Charleston 50% rule and the County’s 49% rule before you size an addition, and add up every permitted improvement from the last five years.

Browse cost guides by project and location

Published ranges are planning references for the scope and location named in each guide. Confirm your address, selections, allowances and exclusions in a written estimate. Fixed-price and cost-plus contracts are both available depending on scope.