A construction loan is short‑term financing used to pay for the actual building of a home, rather than the purchase of an already completed property. Unlike a traditional mortgage, which is issued as a single lump sum and amortized over 15–30 years, a construction loan is typically disbursed in staged “draws” as construction milestones are completed. Borrowers usually make interest‑only payments during the build period, and lenders require approved plans, a detailed budget and a construction schedule before approving funds—because the loan is based on the value of the finished home rather than an empty lot or partially completed structure.
The underwriting and administration of construction loans differ in several practical ways that affect timeline, cost and risk. Lenders will want a licensed builder on board (and often will have to approve that builder), detailed specifications and third‑party inspections at each draw; interest is charged only on the funds already released; and many construction loans either convert to a permanent mortgage at completion (construction‑to‑perm) or require a separate closing for the permanent financing. Expect higher interest rates and upfront fees compared with a standard mortgage, a larger down payment or use of lot equity, and extra paperwork such as builder contracts, cost breakdowns and progressive inspections to protect the lender’s collateral.
At RKM Homes we design and construct custom homes on our clients’ lots, which simplifies several financing steps. If you already own the lot, its equity can often be used toward the down payment; if you don’t, we can coordinate with lenders who offer combined lot‑purchase and construction packages. Our team prepares the detailed plans, line‑item budgets and construction schedules lenders require, coordinates inspections and draw requests, and manages local permitting and site‑specific issues common in the Denver area—like frost‑depth foundations, snow‑load considerations and seasonal scheduling—to keep the build eligible for on‑time draws and a smooth transition to permanent financing.
What types of construction financing can I use to build a custom home?
As a custom home builder I see three practical financing paths most clients use: construction-only, construction-to-permanent, and renovation/owner-builder options. Construction-only loans cover just the build period and are useful if you already own the lot or plan to take out a separate mortgage when the house is finished; they usually require a solid build plan and higher down payment because the lender assumes you’ll refinance into a permanent loan later. Construction-to-permanent combines both stages into one loan and one closing, which removes the need to qualify twice and can protect you from interest-rate movement between build and move-in — that’s often the simplest route for buyers who want predictability on a custom project.
Renovation and owner-builder financing is a different animal: lenders treat projects where the homeowner acts as the contractor or where an existing structure is being remodeled more conservatively. If you’re renovating rather than building new, there are loan products that roll the rehab scope into a mortgage; if you plan to manage construction yourself, expect tighter underwriting, a detailed scope of work, and proof you have the experience and permits. From my experience, most lender teams want a fixed-price contract and professional plans; owner-built jobs can qualify, but you’ll need a lender comfortable with that model and documentation showing you can complete the work on schedule and budget.
What I recommend asking lenders and your builder when comparing these options: will the loan roll land and construction into one product, what minimum equity or down payment do they require, and how do they handle the transition to a permanent mortgage if applicable. Bring a full set of plans, a fixed-price builder contract, and a realistic budget with contingency — those are the items that make lenders comfortable and keep your project moving. If you want the least paperwork and the most certainty on final financing, aim for construction-to-permanent; if you already own the land and plan to refinance immediately after completion, construction-only can be a reasonable, though slightly more complex, choice.
How do construction loan draw schedules, inspections, and disbursements work — and how is that different from a regular mortgage?
A construction loan doesn’t deliver one lump sum like a traditional mortgage; it pays the project in stages as work is completed. Lenders set a draw schedule tied to milestones (for example: foundation, framing, rough‑ins, drywall, finishes, final walk) and only disburse funds for work that has been inspected and approved. Interest during construction is charged only on the amount that has been disbursed, so your monthly carrying cost starts small and grows as the builder completes more stages — for example, at 6% annual interest a $150,000 disbursement costs roughly $750/month in interest during the build phase.
Expect a verification process before each draw: the lender will usually require a site inspection or third‑party inspection report, contractor invoices, and conditional lien waivers before releasing money to the builder or to an escrow account. Turnaround times vary but plan on 5–10 business days between a draw request and actual payment; some lenders hold a retainage (commonly 5–10%) and will withhold the final draw until they receive a certificate of occupancy. Also confirm whether your loan includes an interest reserve (the lender keeps a portion of the loan to pay interest during construction) or whether you’ll need to cover those interest payments out of pocket.
From my experience as a custom home builder, clear expectations eliminate most cash‑flow headaches: get the lender’s draw schedule in writing and match it to the construction contract, require a detailed draw checklist (items the inspector needs to see and the invoices required), and insist on conditional lien waivers tied to each payment. Budget for the expected interest costs during construction, ask who pays the inspector’s fee, and leave a buffer for the typical 7–10 day payment lag and any retainage — doing this up front keeps the build moving and prevents surprises that a standard mortgage (with a single disbursement) rarely presents.
What down payment, credit score, and cash reserves do I need to qualify for a construction loan?
From my experience as a Denver custom home builder, lenders treat construction loans more like a business transaction than a simple home mortgage. Expect to put down about 20–25% of the finished appraised value (or more for owner-builder and heavy renovation projects); if you already own the lot its appraised value can often be used toward that equity requirement. Typical credit expectations are higher than for a purchase mortgage — aim for a 680–720+ score — and underwriters want a stable income history (two years of tax returns if self‑employed, current pay stubs if W‑2). Debt‑to‑income ratios generally need to be in the conventional range (around 43% max, sometimes up to 45% with strong reserves), so run those numbers before you sign a builder contract.
You’ll also need cash beyond the down payment at closing. Plan on closing costs roughly 2–5% of the loan amount, a construction appraisal (higher than a standard appraisal), permit fees, and a builder deposit/retainer (commonly 5–10% of the contract to lock your slot). Lenders will expect to see liquid reserves — not just the money for the down payment — to cover contingencies; a practical rule I recommend is having an additional 5–10% of the construction budget in readily available funds. Bring clear bank statements, proof of lot ownership (if applicable), and an itemized contract and budget from your builder to demonstrate the project’s viability.
A key difference from a standard mortgage is that lenders will underwrite both you and your builder. They want a licensed, insured builder with a verifiable track record and a fixed‑price, itemized contract; if the builder isn’t on the lender’s approved list you may face higher down payment demands or be required to change builders. To streamline approval, get pre‑qualified with a lender experienced in construction lending, provide the builder’s portfolio and references, and have contingency funds documented — doing that upfront avoids last‑minute surprises that kill approvals or force costlier terms.
How does my construction loan convert to a permanent mortgage and what will my payments look like?
When your home is finished the lender will require specific deliverables before converting the construction loan to permanent financing: a final appraisal, a certificate of occupancy or municipal final, the builder’s completion affidavit, and lien waivers for subcontractors and suppliers. If you chose a single-close construction-to-permanent loan the conversion is largely administrative once those items are filed; with a construction-only loan you’ll need to originate a separate mortgage, which means underwriting, credit recheck, and a new closing. From our experience on Denver builds, get the lender’s closing checklist up front and have your builder prepare lien waivers and the completion certification so you don’t lose time — delays can push your conversion into a new rate environment.
At conversion the payment structure changes: whatever principal is outstanding at that moment becomes the balance for the permanent amortization schedule, and monthly payments switch from the construction-period arrangement to fully amortizing principal plus interest. Ask the lender early whether any construction-period interest or fees will be capitalized into the permanent balance or paid separately; this affects the first post-conversion balance and your first full mortgage payment. Before you sign the permanent note, get a written example of the first 12 months of payments so you can budget the jump from your build-phase payments to the permanent principal-and-interest amount.
Interest rate and term decisions during conversion materially affect long-term cost. With a construction-to-perm you can often lock the permanent rate at the start or buy a lock that begins at conversion; with a construction-only loan you must shop for a mortgage when construction ends, so your rate will reflect market conditions at that time. Practical steps we advise: lock or secure a float-down option if you can, avoid major credit changes during the build, and confirm any conversion fees or prepayment rules in writing — these are the items most likely to surprise homeowners on closing day.
How do I budget and manage risk for cost overruns during a construction loan—contracts, change orders, contingency, insurance, and lien waivers?
As an experienced custom home builder, we recommend starting with a realistic construction budget that includes a dedicated contingency fund outside your lender-approved line item. For a new custom home plan, plan on 10–15% contingency; for major renovations, budget 15–20% because unknowns are more likely. Choose your contract type intentionally: a fixed-price or guaranteed maximum price (GMP) contract transfers more cost risk to the builder, while cost-plus or allowances leave more exposure with you; if you’re financing with a construction loan, lenders often expect a conservative budget and may require evidence of owner reserves for change orders, so build cash reserves beyond the down payment.
Require a strict, written change-order process in the contract and enforce it throughout construction: every change must include a clear scope, itemized cost, and schedule impact and must be signed before work starts. Insist on unit pricing for common items (flooring, cabinetry upgrades, finish changes) so you can estimate on-the-fly without blindsiding your contingency. We also recommend a modest retainage (commonly 5–10%) and clear timing for lien waiver submission—payment should be tied to receiving conditional or unconditional waivers from the contractor and key subs so suppliers can’t place mechanic’s liens that would complicate conversion to your permanent mortgage.
Protecting yourself with insurance and documentation prevents financing headaches at conversion. Require your builder to carry robust general liability (commonly $1M per occurrence or more), workers’ comp, and to list both you and the lender as additional insured on the certificate of insurance; if available, a performance bond further reduces risk. Before final draw and mortgage conversion, collect final unconditional lien waivers from the builder and all major subs/suppliers and a final cost reconciliation so the lender can clear liens and release funds—we provide organized waiver packages and will work with your lender to make the handoff to the permanent mortgage as clean as possible.