Pre-Construction Checklist for Maine Homeowners
Pre-construction is the gate between design and dirt. Maine ADU and studio projects that pass through a real readiness checklist before starting site work tend to land on schedule and on budget; projects that skip it tend to surface expensive surprises in the first month of construction. This checklist organizes readiness across five gates: feasibility, design lock, permits issued, pre-construction logistics, and money and contracts.
Last updated: 2026-05-02 | Author: Place Buildings Editorial Team | Reviewer: Place Buildings Project Review Team
Five-gate pre-construction readiness summary
| Gate | What "ready" means | When to clear it |
|---|---|---|
| 1. Feasibility | Lot can support the project; major constraints documented | Before design spend |
| 2. Design lock | Use case, layout, foundation, and systems all decided | Before permit submittal |
| 3. Permits issued | Building, septic, driveway, electrical, plumbing as applicable | Before site mobilization |
| 4. Pre-construction logistics | Contractors scheduled, utilities coordinated, deliveries planned | Before ground-break |
| 5. Money and contracts | Budget locked, contingency defined, change-order rules in writing | Before any payment |
Why Pre-Construction Discipline Matters
Most ADU and studio surprises do not appear at design - they appear at site work. Survey issues, septic constraints, utility conflicts, contract ambiguities, and access problems usually surface in the first month of construction, long after they could have been caught and fixed cheaply.
A pre-construction checklist is not paperwork overhead. It is a structured pause before the most expensive part of the project so you do not pay for surprises that were knowable. The five gates below catch most of them.
Gate 1: Feasibility
Clear before any meaningful design spend. The cost of feasibility is small; the cost of redoing design after a feasibility surprise is large.
- Property survey or current plot plan available (or scheduled).
- Zoning, setbacks, height, lot coverage, and impervious-surface limits confirmed.
- LD 2003 eligibility verified (a single-family dwelling already on the lot). See our LD 2003 explainer.
- HOA, deed restrictions, or covenants reviewed.
- Septic record pulled and capacity reviewed for any added bedroom load.
- Utility distances measured: water, sewer or septic, electrical, and gas where applicable.
- Access route for delivery confirmed against the largest piece of equipment or the prefab unit dimensions.
Gate 2: Design Lock
Lock the design before submitting for permit. Late design changes during permit review cost calendar time and often trigger re-review of structural and energy compliance.
- Use case locked: long-term rental, short-term rental, guest, multi-generational, owner-occupied, or office/studio.
- Floor plan and elevations chosen.
- Foundation type selected - concrete piers, helical piles, or slab - driven by site conditions and design.
- Mechanical, electrical, and plumbing scope defined.
- Energy compliance approach decided (REScheck or full energy modeling). See our MUBEC compliance checklist.
- All design decisions documented and signed off before permit submittal.
Gate 3: Permits Issued
You cannot pour concrete or break ground without permits in hand. Most Maine towns enforce this strictly, and starting work without a permit can void financing and insurance.
- Building permit issued by the municipal Code Enforcement Officer.
- Subsurface wastewater (septic) permit issued, when applicable.
- Plumbing and electrical permits filed and issued.
- Driveway, curb cut, or stormwater permits issued where applicable.
- Inspection schedule reviewed with the CEO so framing, rough-in, insulation, and final inspections do not stack.
- Permit validity window noted and your start date planned inside it.
Gate 4: Pre-Construction Logistics
Logistics work runs in parallel with the second half of permit review. By the time the permit is issued, the build can mobilize within a week or two - instead of restarting the clock to find a contractor or order materials.
- Site prep contractor scheduled with a mobilization date.
- Foundation contractor scheduled.
- Utility tie-ins coordinated with the local providers (water, sewer/septic, electrical, gas).
- Material delivery plan in place - especially for the prefab unit itself, which may have specific access and crane requirements.
- Inspection sequence defined: foundation, framing, mechanical rough-in, insulation, final.
- Builder's risk insurance and standard liability coverage in place.
- Site safety, fencing, and neighbor access plan defined.
- Single point of contact established between homeowner and project team.
Need a property-specific answer?
We can map permitting, cost, and timeline to your lot before you commit.
Gate 5: Money and Contracts
The most-skipped gate, and the one that most often turns small surprises into legal disputes. Get it in writing before any payment.
- Total installed budget locked with an explicit contingency line - typically 8% to 12% on prefab or modular ADUs on straightforward sites; 15% to 20% for unique conditions like ledge, long utility runs, or complex access.
- Payment schedule defined in writing, tied to milestones (mobilization, foundation complete, framing complete, mechanical rough-in, final).
- Change-order policy defined in writing: what triggers a change order, who approves, and what cost threshold requires re-approval.
- Financing lock-in confirmed if using a construction loan, HELOC, or cash-out refinance.
- Neighbors notified where local notice is required or simple courtesy applies.
When to Pause
If any of the items in Gates 1 through 5 are not yet clear, pause. Starting construction with an unclear gate is the most expensive way to discover a problem. Specific stop-the-line conditions:
- Septic capacity uncertain - engage a Licensed Site Evaluator before mobilization.
- Permit not yet issued - do not start any work; most towns enforce this strictly and many lenders require permit copies for draw releases.
- Contract terms unclear - clarify in writing before paying.
- Budget contingency under 5% - top up before starting.
- Single point of contact undefined - designate one before mobilization.
Validate Your Readiness
For a town-specific feasibility and pre-construction review, Request a Free Property Feasibility Assessment. For broader project timeline context, see our ADU project timeline guide. To explore layouts before locking design, try Configure 3D.
Frequently Asked Questions
Does this checklist apply to backyard studios too?
Yes, with one practical difference: most studios skip Gate 3's septic and full plumbing items, since many studios have no plumbing fixtures or share the main house's existing systems. Everything else applies the same way.
How big should my contingency line actually be?
For prefab or modular ADUs on straightforward sites, 8% to 12% of the total installed budget is typical. For unique conditions - ledge, long utility runs, complex access, or unusual designs - push to 15% to 20%. The contingency exists to absorb surprises that survive feasibility, so it should be sized to absorb them without forcing late-stage scope cuts.
When should I notify neighbors?
If your town requires abutter notice, that runs through permit review automatically. Beyond that it is courtesy: a brief note before site mobilization explaining timeline and disruption tends to prevent neighbor complaints from showing up at the wrong moments. Two weeks before ground-break is a reasonable window.
What is the most-skipped gate?
Gate 5 - money and contracts. Homeowners frequently start work with verbal agreements on contingency and change orders, which means small surprises become contract disputes. Get the contingency, payment schedule, and change-order rules in writing before any payment changes hands.
Can the gates run in parallel?
Yes - Gates 4 and 5 typically run alongside Gate 3 (permit review). Gates 1 and 2 should be cleared sequentially since each depends on the prior. Trying to lock design before feasibility is what creates the most expensive late-stage rework.
Sources
We refresh legal and compliance references regularly to keep guidance current.
Related Maine Guides
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