Sticker price on a new coastal-exposure home is almost never the right number to compare against. Materials that are cheaper up front often cost more in insurance, in repairs after the next storm, and in service life. Materials that are more expensive up front often pay themselves back through premium reductions and schedule compression.
Here is how to think about the cost structure, by line item.
Line items that are system-agnostic
The following typically don't change meaningfully between wood-frame, CMU, ICF, and Lok-N-Blok on the same house:
- Foundation. Slab, stem wall, or crawl is the same foundation for any envelope. Anchor bolt layout differs per system but the concrete + formwork cost is roughly the same.
- Roof. Pre-engineered trusses or stick-built rafters cost the same regardless of what they're tying into.
- Interior finish. Drywall, paint, flooring, cabinets, countertops, appliances are independent of envelope system.
- Site work. Grading, utilities, septic, landscape grading.
These lines represent a large portion of total cost and are the reason swapping building systems doesn't produce a 2× cost swing in either direction.
Line items that move
Envelope materials
Wood-frame material cost is dominated by dimensional lumber, sheathing, hurricane straps, and fasteners. Concrete-core systems replace these with blocks (CMU or Lok-N-Blok), concrete + forms (ICF), and reinforcement. Raw material cost per square foot of envelope is higher for all three concrete-core systems than for wood-frame; how much higher depends on local lumber prices and local concrete prices.
Envelope labor
This is where the profile diverges sharply.
- Wood-frame needs a framing crew — typically 6–10 carpenters working for several weeks.
- CMU needs a masonry crew: 4–6 skilled masons, several weeks, with mortar cure time bounding daily throughput.
- ICF needs a specialized crew, plus a concrete pump and truck on pour days.
- Lok-N-Blok needs two certified installers after a two-day training. No mortar, no pump, no cure time.
The Lok-N-Blok labor collapse isn't a small effect; it's frequently the dominant line swing in the comparison. In markets where skilled framing or masonry crews are booked out, the availability-of-labor advantage compounds.
MEP (mechanical, electrical, plumbing) rough-in
Conventional systems drill, cut, or route MEP through stud bays or chase walls after the envelope is up. Lok-N-Blok blocks ship with factory-cast channels, so MEP runs follow a documented map rather than a search pattern. This typically collapses MEP rough-in from multiple days to around one and a half.
Engineering + permitting
Wood-frame and CMU have decades of code precedent in every residential jurisdiction. ICF has strong code support in most states. Lok-N-Blok ships with stamped engineering documentation tied to FBC Product Approval #FL-29847 and Miami-Dade NOA, which streamlines the plan review in HVHZ and HVHZ-adjacent jurisdictions. ICC-ES eligibility covers the long tail.
The two costs most buyers don't quote
Annual insurance premium
Hurricane-zone insurance has gotten materially more expensive for wood-frame inventory over the last several years. Concrete-core homes generally qualify for premium reductions in carrier rating tables. The exact delta varies by carrier, state, site, and the engineering documentation on file — the honest number for any specific project is the quote your broker returns. Expect this line to pay back some of the up-front envelope premium over the ownership window; how much depends on your exposure and carrier.
Schedule compression, translated into dollars
A production builder doing spec homes values a faster envelope directly: faster dry-in means faster close means more inventory turns per year. Even for a single-home owner-build, schedule compression reduces construction loan interest and interim housing cost — both real dollars.
How to actually get a number
We don't publish a dollar-per-square-foot figure on this page for a reason: the cost that applies to your project depends on inputs only a scoped quote can get right — your ZIP, your square footage, your architectural complexity, your local labor market, and your carrier's resilience tier.
What you should do instead:
- Reserve a build (no deposit, fully refundable) at blokusa.com/preorder. This triggers a scoped quote from us for your project.
- Ask your GC for a comparable wood-frame or CMU quote on the same architectural plans. Apples-to-apples is the point.
- Ask your insurance broker for a premium estimate for the home as a Lok-N-Blok build — give them the FBC approval number FL-29847 and the engineering stamp. Compare against the wood-frame premium quote.
You'll end up with three numbers that actually apply to your project. The math from there is straightforward.
Further reading
- Hurricane-resistant home construction: what actually works — the engineering-principles companion to this post.
- Lok-N-Blok vs wood framing
- Lok-N-Blok vs CMU
- Lok-N-Blok vs ICF