The renovation budget mistakes that cost South Florida homeowners the most are predictable: no contingency, allowances set too low, selections made late, design changes after framing, change orders approved without a price, and choosing the lowest bid without checking what it leaves out. Add Florida’s lien law and deposit rules to that list, because paying the wrong way can cost more than any of them.
When a renovation ends up well over its number, the cause is almost never a single dramatic event. It is an accumulation of predictable things, and they happen in roughly the same sequence on every project. Here they are in that order, with what to do about each.
1. No contingency
The most common and most damaging error. A budget with no contingency is not a budget; it is a best case.
In an older home, something will be found behind a wall. Cast-iron waste line at the end of its life. Aluminum wiring. Previous water damage nobody disclosed. A “structural” wall that is not, or one that is. If the house is more than thirty years old, assume you will find at least one of these.
Set aside 10–15% for a straightforward project and 15–20% where walls are coming out or the house is older. Treat it as spent. If it is not needed, that is a pleasant surprise rather than the plan. Our guide to renovating an older Florida home covers the usual suspects in detail.
2. Misunderstanding allowances
Allowances are placeholder amounts for things not yet chosen. “Tile allowance: $6 per square foot.” “Plumbing fixture allowance: $3,500.”
They are legitimate and necessary. They become a problem when the allowance is set low to make the total look competitive, and then you choose tile at $18 a foot, and the difference appears as a change order.
Before signing, go and look at what the allowance actually buys. If the tile allowance covers material you would not put in your house, the quote is not what it appears to be. Ask for the allowance to be revised to something realistic before comparing bids, otherwise you are comparing two different projects. For reference, Miami cost guidance puts installed quartz countertops at roughly $75–100 per square foot and new floor tile in a mid-range remodel at about $10–20; an allowance far below the market is a signal.
3. Late selections
This costs money in two ways at once. It delays the schedule, because tile that has not been chosen cannot be ordered, and it forces choices under pressure, which is when people accept whatever is available rather than what they wanted.
Every selection should be made and ordered before demolition begins. Not decided in principle. Ordered, with a confirmed delivery date. Our article on how long a renovation takes shows how late selections ripple through a schedule.
4. Changing your mind after the framing is up
Moving a wall on a drawing costs an eraser. Moving it after framing is done costs the framing, the electrical and plumbing rough-in already installed to that framing, the re-inspection, and the schedule.
Spend real time on the plan. Walk it, tape it out on the floor, live with it for a week. Every hour spent on the drawing saves several on site.
5. Change orders that are not priced before the work happens
The mechanism is familiar. Something comes up. The contractor mentions it in passing. You say go ahead. The cost appears on the final invoice, and it is more than you expected, and now you are arguing about work that is already finished and paid for by the contractor.
Every change gets a written price and your written approval before the work is done. Every one, including small ones. A contractor who resists this is telling you how the end of the project is going to go.
6. Choosing on price alone
When one bid is dramatically lower than the others, that difference is somewhere. Usually in one of four places: allowances set unrealistically low, scope quietly excluded, cheaper materials substituted, or work that will be done without permits.
The low bid frequently does not stay the low bid. It becomes the middle bid by month two and the highest by completion, with the added feature that you are now committed and have already paid deposits.
Compare bids line by line. If one is missing something the others include, it is not cheaper; it is a different job. The contract structure matters too, and fixed-price vs. cost-plus contracts explains how each one shifts risk.
7. Paying in a way Florida law does not protect
This one is specific to Florida and it is expensive when it goes wrong. Under the state’s construction lien law, subcontractors and suppliers who are not paid can place a lien on your property, even if you paid your contractor in full. That is why Florida requires a lien-law disclosure in residential contracts over $2,500, and why the official Notice of Commencement form warns that improper payments can result in paying twice for the same improvements.
Three habits protect you:
- Ask for written lien releases from the contractor, and from major subcontractors and suppliers, before each payment.
- Keep the Notice of Commencement current. Payments made after it expires are treated as improper.
- Watch deposits. If a contractor takes more than 10% of the contract price up front, Florida law requires them to apply for permits within 30 days and start work within 90 days of the permits being issued, unless there is just cause or you agreed in writing to longer.
Before any of that, verify the contractor’s state license on the DBPR site, myfloridalicense.com, and ask for their certificate of insurance. Our contractor hiring checklist lists what else to check.
8. Skipping the permit to save money
Permits cost money and time, so the temptation is understandable. The savings are rarely real. Unpermitted work can mean opening finished walls later so an inspector can see what is inside them. It surfaces at resale, when a buyer’s inspector or the permit record does not match the house.
In Florida there is a second trap. Permits are issued in the name of the person responsible for the work, so if you pull one as an owner-builder so that someone without a contractor license can do the job, that responsibility is yours. The risks are set out in owner-builder permits in Florida. If the house is in a flood zone, also check how the project cost compares with the value of the building before you set the scope; the FEMA 50% rule explains why.
9. Over-improving for the house or the plan
Not every dollar comes back. In 2025 Cost vs. Value data for the South Atlantic region, a midrange minor kitchen remodel recovered about 109% of its cost at resale, while an upscale major kitchen remodel recovered about 36% and an upscale bathroom about 41%. A backup generator recovered about 97%, which says something about what buyers here value.
That is not an argument against a beautiful kitchen. It is an argument for being clear about whether you are renovating to live there or to sell. If you are selling within a couple of years, read renovations that add value in Miami first.
Questions to ask before you sign
- What exactly is excluded from this price?
- What does each allowance buy, and can I see the product?
- How are change orders priced and approved?
- What is the payment schedule, and what milestone triggers each payment?
- Will you provide lien releases with each payment request?
- Who pulls the permit, and is its cost included?
- How much is held back until the punch list is complete?
A budget that holds
- Written scope with inclusions and exclusions stated explicitly
- Allowances set at realistic levels, verified by actually looking at the products
- 10–20% contingency, treated as committed
- All selections ordered before demolition
- Change orders priced and approved in writing, in advance
- Lien releases collected with every payment
- Payments tied to completed milestones, with a meaningful final payment held until the punch list is closed
None of this is complicated. It is simply written down before the work begins rather than argued about afterward. If you want a scope and budget built this way for your project, see how we approach home renovation or ask for a site visit.
Frequently asked questions
How much contingency should I add to a renovation budget?
We recommend 10 to 15% for a straightforward project in a newer home, and 15 to 20% when walls are coming out, the layout is changing, or the house is more than thirty years old. Treat the contingency as committed money. Older South Florida homes regularly reveal worn cast-iron drains, outdated wiring or past water damage once walls are opened.
What is an allowance in a construction contract?
An allowance is a placeholder amount for an item you have not chosen yet, such as tile per square foot or a fixture budget. If you choose something more expensive, the difference is added as a change order. Allowances are normal, but check what each one actually buys before comparing bids, since low allowances make a quote look cheaper than it is.
Can a subcontractor put a lien on my house in Florida if I paid my contractor?
Yes. Under Florida’s construction lien law, unpaid subcontractors and suppliers can file a lien against the property even when the owner has paid the contractor. That is why residential contracts over $2,500 must carry a lien-law disclosure. Protect yourself by collecting written lien releases before each payment and keeping the Notice of Commencement current.
How much deposit should a contractor ask for in Florida?
Florida law does not set a single cap, but it does add obligations above 10%. A contractor who receives more than 10% of the contract price on residential work must apply for permits within 30 days and start within 90 days of permit issuance, unless there is just cause or a written agreement otherwise. Tie later payments to completed milestones.
Why is the cheapest renovation bid often not the cheapest?
A much lower bid usually means low allowances, excluded scope, cheaper materials or no permits. Those gaps return as change orders once you are committed and have paid a deposit. Compare bids line by line, ask what each one excludes, and treat a bid that is missing items the others include as a different project, not a better price.
