What Does It Really Cost to Build a Caribbean House?

The most dangerous building-cost number is a single price per square foot. It is useful for a first comparison, but it can hide almost everything that turns an empty plot into a finished, usable home. A realistic budget separates the building itself from site work, services, external works, professional costs and the money needed for surprises.

House plans and calculator on a table overlooking a Caribbean bay — The true building cost is more than the contractor’s price for the shell. Site work, approvals, utilities, external works, finishes and a realistic reserve belong in the budget from the beginning.

Do not use forum prices as a quotation. Island, access, freight, finishes, soil, roof type, exchange rates and labour conditions can move costs dramatically. Use local quotations. The calculator below is designed so you enter the prices that apply to your project.

Full-project cost calculator

House area (sq ft)

Quoted building rate / sq ft

Plans, engineering, approvals

Clearing, excavation, fill, retaining

Water tank, pump, plumbing outside house

Septic/sewer and site drainage

Fence, gate, driveway, external works

Electric/water/data connections

Kitchen, wardrobes, fixtures, appliances

Other known costs

Contingency (%)

Currency label

Why the “price per square foot” can mislead you

It may stop at the building line

The contractor may price the structure and interior but exclude boundary walls, driveway, drainage, tanks, septic, utility fees and landscaping.

It may hide assumptions

A quotation can assume shallow footings, easy access, standard tiles or a basic kitchen. The actual site or specification can invalidate those assumptions immediately.

It may describe a different finish

Two houses with identical floor area can have very different window systems, roof finishes, bathrooms, cabinetry, electrical work and hurricane protection.

Build your budget in five layers

Layer	Typical items to include	What to ask
1. Pre-construction	Survey, design, structural input, quantity/cost advice, permits, financing costs	Which fees are fixed and which depend on area/value?
2. Site	Clearing, excavation, fill, soil problems, retaining, temporary access	What ground condition has the quote assumed?
3. House	Foundation, structure, roof, windows, plumbing/electrical rough-in, finishes	Exactly which materials and finish level are included?
4. Services & external works	Tank/cistern, pump, septic/sewer, stormwater, meter connections, driveway, fence, gate	Are these in the contract price or outside it?
5. Move-in & reserve	Kitchen appliances, fans/A/C, lighting, security, furniture, contingency	How much cash is still needed after “construction complete”?

A useful comparison method: ask every contractor to price the same approved drawings and the same written schedule of finishes. Then make a second table containing every excluded item. Only compare the final all-in totals.

How much contingency?

There is no universal Caribbean percentage. A simple, flat site with complete drawings and a fixed specification should carry less uncertainty than a steep site, imported finishes, renovation work or a project started before all details are resolved. Instead of treating contingency as “extra money to spend”, keep it outside the construction contract and release it only when a real unforeseen cost appears.

Three figures you should always know

Contract sum: what the builder is contracted to provide.
Known project extras: everything necessary that is outside the contract.
Cash-to-complete: contract + extras + financing/professional costs + contingency - amounts already paid.

Further reading and technical basis

Forum amounts vary by date and project and are not used here as current market prices. Their value is showing which categories homeowners repeatedly forget.