How to Build a Rehab Budget, Tier by Tier

A budget is built in layers, not guessed in one number

Ask three investors what a house needs and you will get three numbers, because most rehab figures are really three different questions collapsed into one. How much work is there? What does that scope of work cost per square foot? And how much cushion sits on top for the things nobody can see yet? A budget built tier by tier keeps those questions separate. The tier answers the scope. The square footage turns the scope into a range. The contingency answers the unknowns. When a deal goes sideways later, you can point to the exact layer that moved — the house was a heavier tier than it looked, or the range was fine and the cushion was too thin — instead of discovering that the whole number was a mood.

The order matters because each layer depends on the one before it. You cannot price the work before you have honestly scoped it, and you cannot size a contingency before you know the base it is a percentage of. Build it backwards — start from the offer you want to make and shave the rehab down until the deal works — and you have not built a budget at all. You have built a justification. The house does not care what your offer needed the repairs to cost.

The four tiers, in the estimator's own numbers

Our Rehab Cost Estimator prices four tiers. These are the tiers printed on the Rehab Cost Cheat Sheet, and they are the rates used in every example below — your market and your contractor will move them, which is why each tier is a range and not a point.

Light — $5–$10 per square foot, planning rate $7.50. Paint, floors, and fixtures. The systems work; the house is tired, not broken. This is the refresh tier: surfaces and finishes, nothing behind the walls.

Standard — $15–$25 per square foot, planning rate $20. Kitchen and bath updates, flooring, and paint. The typical tired rental lives here when its roof, HVAC, and structure are sound — real renovation of the rooms people live in, on top of systems that still do their jobs.

Major — $30–$50 per square foot, planning rate $40. Full remodels and system upgrades. When a big system has to be replaced — roof, HVAC, foundation work, a rewire, a repipe — the house is in Major territory no matter how the kitchen looks.

Full Gut — $60–$80 per square foot, planning rate $70. Strip it to the studs and build back all new. This tier is a construction project that happens to have an existing frame, and it should be budgeted like one.

Notice what separates the tiers. It is not how nice the finishes are. A Standard kitchen and a Major kitchen can have the same cabinets; the difference is everything behind and above them. Tiers are set by scope and systems, not by taste — and that one fact drives the whole build.

One house, four budgets: why the tier choice is the budget

Run one example house through all four tiers and the point stops being abstract. Every figure here is an illustration, labeled as such — your house produces its own. Take a 1,500 square foot house and price it at each tier in the Rehab Cost Estimator.

The same walls, the same roofline, the same address — and the planning number runs from $11,250 to $105,000 depending on a single judgment call. Nothing else in the budget has that kind of leverage. An error of a dollar per square foot moves a 1,500 square foot budget by $1,500. An error of one tier moves it by tens of thousands. That is why experienced investors argue about the tier and shrug about the finishes: the tier decision is most of the budget, made before a single line item exists. Get the tier right and the rest of the build is arithmetic. Get it wrong and no amount of careful arithmetic rescues the number.

Pick the tier by the systems, not by the surfaces

So how do you place a house in the right tier before a contractor walks it? Walk it in the order the money hides: roof first, then HVAC, foundation, electrical, and plumbing — the systems inside the walls and over the ceiling — and kitchens, baths, and cosmetics last. Surfaces are what a house shows you. Systems are what it charges you. A dated kitchen over sound systems is a Standard house with an ugly room. A fresh kitchen over a dead roof and a tired HVAC is a Major house wearing a costume, and the costume is the most expensive way to learn the difference.

Price the mistake so you recognize it. Take a smaller example: a 1,200 square foot house that presents as Standard — planning number $24,000, range $18,000–$30,000. Now the walk finds the big system is gone and the house honestly belongs in Major: planning number $48,000, range $36,000–$60,000. One failed system doubled the budget, and with a 10% contingency the number you would carry into your offer math moves from $26,400 to $52,800. Nothing about the rooms changed. The tier moved, and the budget followed it — which is why the systems check happens before the tier is locked, not after the offer is signed.

A range has three numbers, and each one has a job

The estimator returns a range, and the range is not indecision — it is three different tools. The low end is what the job costs if everything goes right, which makes it the one number you should never offer on; building an offer on the best case means every surprise comes straight out of your margin. The planning number — square footage times the tier's standard rate — is the working figure: the one you plan the project around and the base your contingency is calculated on. The high end is the number that belongs in your offer math, because an offer has to survive the job going ordinarily wrong, not just ordinarily right. Offer on the high end; if the job lands lower, the deal gets better. That is the only direction a surprise should run.

Watch how this plays on the Standard example above. The range is $22,500–$37,500, the planning number is $30,000, and with the 10% contingency added, the planning figure you underwrite to is $33,000. Three numbers, three jobs: $22,500 is the hope, $33,000 is the plan, and $37,500 is the ceiling the offer respects. An investor who carries one number is forced to use it for all three jobs, and it will be wrong for at least two of them.

Contingency is a line, not a feeling

The last layer is the contingency — a percentage added on top of the planning number for the conditions nobody can see until the walls open. In the estimator it is an explicit input, and our floor is 10%: on the 1,500 square foot Standard example, $30,000 becomes $33,000 at 10% and $34,500 at 15%. Older houses earn more, because age is where hidden conditions live — the wiring, the drains, and the repairs somebody else did creatively decades ago.

Two rules keep the contingency honest. First, it is calculated on the planning number, in the open, as its own line — never padded invisibly into the per-square-foot rate, where it gets spent twice or argued away. Second, it is not a slush fund for upgrades. Contingency pays for what the house hid, not for the nicer countertop somebody fell for mid-project. The moment contingency starts buying finishes, it stops existing for the day the crew finds the real problem — and there is always a day like that in an old house.

What the tier number does not include

A tier budget prices the work. Only the work. It does not include the cost of holding the house while the work happens — taxes, insurance, utilities, and financing for every month between purchase and sale — and it does not include the closing and selling costs at either end. Those numbers are real, they are large, and they live in the Flip Profit Calculator and in the 70% rule's margin, not in the rehab tiers. The budgeting error to avoid runs in both directions: forgetting the holding costs because the rehab number felt complete, or stuffing them into the rehab line where they get counted again downstream. Keep the layers separate all the way into the offer math: rehab from the tiers, holding and selling from the flip math, each visible, each counted once.

From tier budget to real bid

One honest limit, stated plainly: a tier budget is a pre-walkthrough instrument. It exists so you can make a serious offer before a contractor has priced the job, and its range is the honest width of what you do not know yet. When a contractor does walk the house, the budget narrows into line items — and when a specific big-ticket replacement is already known and quoted, carry it as its own visible line alongside the tier figure rather than burying it inside a rate. Then compare the bid against the tier range. A bid inside the range confirms the tier. A bid far below it usually means scope is missing. A bid far above it means the tier was wrong or the bid is — and either way, you now know which layer to argue about.

The build, in order

One: walk the systems first — roof, HVAC, foundation, electrical, plumbing — and let what you find place the house in its tier. Two: multiply the square footage by the tier's range and take all three numbers: low, planning, high. Three: add the contingency to the planning number, as its own line, 10% at the floor and more for older houses. Four: carry the high end into your offer math and the planning-plus-contingency figure into your project plan. Five: keep holding and selling costs in the flip math where they belong, counted once. Do those five things and the rehab budget stops being the number that sinks deals quietly — it becomes the number the whole deal can stand on, because every layer of it can be shown, checked, and defended.