Karsten Wenzlaff, Advisor
August 26th, 2025
Karsten Wenzlaff is a Crowdfunding and Fintech Expert from Germany. He is Secretary-General of Digit[...]
5 Tips to Prepare Budgets for Real Estate Developments
Sep 16, 2026
A development budget is the most-read document in a real estate deal and the least understood. Investors read it to decide whether to fund. Lenders read it to size the loan. The developer reads it to find out whether the project makes money. All three assume the number came from somewhere solid, and in a surprising share of projects it came from a per-square-foot figure someone remembered from the last one.
I prepare construction cost estimates for developers and builders, from full-building takeoffs down to concrete estimating services for the structural package alone, which means I see a lot of budgets after they have been built and a fair number after they have failed. The failures rarely trace back to a bad market. They trace back to a budget that was assembled top-down, from a total that felt right, instead of bottom-up, from the work that actually has to happen. Here are the five habits that separate the budgets that hold from the ones that do not.
1. Build the hard costs from a takeoff, not a rate
The hard cost line, the physical construction, is usually 60 to 70 percent of a development budget and it is where most of the error lives. A square-foot rate borrowed from a comparable project carries that project's accidents inside it: its soil, its subcontractor pricing that month, its owner who never changed anything.
The alternative is a takeoff. Measure the drawings, even schematic ones: cubic metres of excavation, square metres of slab, linear metres of foundation wall, storeys of structure, square metres of envelope, number of units and their fit-out. Price each line with material and labour separated. Anyone who has priced the structural package will tell you it alone can swing 15 percent between a slab-on-grade and a podium over parking, and a rate per square foot cannot see the difference. A takeoff can.
At the pre-development stage the drawings will be thin. Measure anyway, and record every assumption next to the quantity so it can be corrected when the design firms up.
2. Treat soft costs as a schedule, not a percentage
Soft costs, meaning design fees, permits, legal, financing, marketing, development management, are often budgeted as a flat percentage of hard costs, and that is how they become the second-largest surprise in the pro forma.
Soft costs are driven by time, not by construction value. An architect's fee is tied to the contract, but the development manager, the interest reserve, the insurance, and the property taxes during construction all run by the month. A project that was budgeted for 18 months and takes 26 does not overspend its soft costs by a little; it overspends them by 40 percent or more, and the interest line is the one that compounds.
Build the soft cost budget from a schedule. List each cost, its start and end month, and its monthly rate. Then stress it: what does the number look like at 22 months, at 26. If the deal only works at 18, the deal does not work.
3. Put the contingency where the risk actually is
Most budgets carry one contingency line, five or ten percent of hard costs, and treat it as a single bucket. The problem is that risk is not evenly spread across a project. It is concentrated in the ground, in the existing structure if there is one, and in anything the drawings have not yet decided.
A better approach is to carry contingency by area. Site and foundations, where unknown soil and buried utilities live, might carry 15 to 20 percent. Structure and envelope, which are well understood once designed, might carry 5. Interior fit-out, where the owner's selections can still change, carries something in between. Add a separate design contingency at the early stages that burns down as the drawings mature, and an owner's contingency that nobody but the owner can touch.
The total may still land near ten percent. The difference is that when the excavator hits rock in month two, the money is already sitting in the line that expected it.
4. Get a second number before you sign the first one
The contractor's price is a bid, and a bid is a sales document as much as a cost document. It is produced by the party who wants the job, under time pressure, in a competitive situation, and it reflects that.
An independent estimate is a different animal. It is prepared by someone whose only job is to measure and price, with no stake in winning the work. Set against the contractor's bid, it does two things. It tells you whether the bid is realistic, which protects you from the low number that becomes a change-order machine in month nine. And it tells you where the bid is fat, which gives you something specific to negotiate instead of a general plea for a discount.
On a project of any size, the cost of that second number is a rounding error against the cost of finding out the first one was wrong.
5. Re-budget at every gate, and keep the history
A development budget is not a document; it is a series of them. The number at land acquisition, at schematic design, at permit, at tender, and at contract award should each be a fresh budget, built from the information available at that gate, and each should be saved alongside the one before it.
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The history is where the learning lives. When the tender comes in 12 percent over the schematic estimate, the comparison shows exactly which lines moved and why, and the next project's early budget gets better. Developers who overwrite the old number with the new one lose that, and they make the same optimistic assumptions on every deal.
The budget is the deal
Investors and lenders will forgive a project that is late. They rarely forgive one that is over, because an overrun is money that has to be found from somewhere, usually from them, usually at the worst possible moment. The budget that prevents it is not clever. It is measured, it is time-based, it is honest about where the risk sits, and it is checked by someone with nothing to gain. Everything else in the pro forma sits on top of that number, so build it first and build it properly.
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