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Bettesworth Construction
Construction Costs

How to Budget for a Home Renovation and Avoid Cost Overruns

A realistic renovation budget starts with a clear scope and several comparable bids. Learn how to plan for allowances and uncertainty, control changes, track costs, and stage payments.

By Bettesworth Construction Team 9 min read
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To budget for a home renovation, first set the most your household can afford, define exactly what work is included, and compare several written estimates on the same scope. Then separate fixed selections from allowances, keep a reserve sized to your project’s uncertainties, and require written approval for every scope or price change. There is no single renovation cost or contingency percentage that fits every home: location, condition, scope, materials, labor, permits, and finish choices all affect the total.

Why do renovations go over budget?

Overruns can come from both unexpected costs and decisions made during the project. The 2026 U.S. Houzz & Home Study surveyed 20,358 users, including 10,176 U.S. homeowners who renovated, about renovation activity in 2025 and plans for 2026. Among its respondents who renovated in 2025, 75% said they set an initial budget; 37% said they exceeded it, while 35% said they stayed on target. These are self-reported survey results from Houzz users, not a forecast for every U.S. project or a probability that a particular renovation will overrun.

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Among Houzz’s respondents who reported exceeding their budget for 2025 work, 52% cited products or services costing more than expected, 35% said they chose higher-end materials, and 31% said they expanded the project scope during renovation. Those reasons can overlap. The pattern is useful: some cost increases arrive from conditions or prices that are hard to know at the outset, while others follow deliberate choices to upgrade or add work.

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Houzz reported a median renovation spend of $20,000 for 2025 and a median planned spend of $15,000 for 2026. Both figures are survey medians across varied U.S. projects, not estimates for a specific room, home, or contractor bid. Project size and location, the home’s condition, labor markets, permits, materials, and chosen finish level can make an individual budget very different.

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An earlier 2022 U.S. Houzz & Home Study found that 25% of respondents who went over budget cited unexpected construction-related issues. That older finding is a reminder that concealed conditions can matter, but it should not be treated as a current rate or applied to a particular project.

How do I budget for a home renovation?

Build the budget from the work you intend to buy, not from a broad average or a desired monthly payment. A useful starting point is a written scope, several estimates based on that scope, and a plan for decisions and risks that are not yet resolved.

1. Set a household ceiling and rank priorities

Choose the maximum total your household can support before asking contractors to price upgrades. Distinguish essential work from desirable improvements. For example, separate a needed plumbing repair or accessibility change from optional premium fixtures, added storage, or a larger finish upgrade. This gives you a way to make trade-offs if bids or conditions push the total higher.

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Do not assign the entire ceiling to the first estimate. The estimate may rely on assumptions, later product selections may exceed allowances, and work exposed during demolition can reveal additional needs. Leave room for uncertainty, but do not choose an arbitrary percentage and assume it will cover every risk. A reserve is useful only if it is realistic for the scope and affordable for the household.

2. Define the work in enough detail to price

Write down what the project includes and excludes. Record the rooms or areas involved, dimensions or footprint, finish level, major systems, demolition and disposal needs, and access constraints such as narrow stairs or limited work hours. Note whether the contractor or homeowner is responsible for permits, deliveries, temporary protection, and cleanup. If a task is outside the contractor’s scope, name it explicitly so it does not silently disappear from the budget.

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Provide professionals with the information available before pricing. Houzz’s consumer guidance recommends sharing basic space, electrical, mechanical, and lighting plans to improve budget estimates. Plans do not guarantee a final price, but they can help contractors identify assumptions and price a more consistent scope.

3. Get several written estimates

The Federal Trade Commission advises homeowners to get written estimates from several firms and ask why bids differ. Its guidance cautions that the lowest bidder may not be the best choice. A low bid can reflect a different scope, omitted tasks, lower assumptions for materials, or costs that have not yet been resolved. A high bid may include work or protections another estimate leaves out. Ask contractors to explain meaningful gaps instead of judging by the total alone.

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Check references for relevant projects and verify licensing and insurance requirements with the appropriate state or local authorities. Requirements differ by location, so do not assume a contractor’s status or permit responsibilities based on another jurisdiction’s rules.

4. Separate selected products from allowances

Where you have chosen a product, record identifying details such as brand, model, size, finish, or an agreed equivalent specification. For items not selected yet, put the allowance amount in writing and state who will choose and purchase the item. The FTC recommends making clear both the allowance and responsibility for later selections.

An allowance is a budget assumption, not proof that the final item will cost that amount. If a bid contains a low allowance and your eventual choice costs more, the difference can raise the project total. Ask what the allowance covers, whether related labor or delivery is included, and how a selection above or below the allowance changes the contract price.

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5. Estimate local costs, then use project-specific bids

Localized cost information can help you judge whether an initial expectation is plausible, but it cannot account fully for your home’s condition, access, scope, or exact selections. Houzz describes its Real Cost Finder as drawing on collected renovation and decorating data; its 2013 announcement also stresses that local estimates are needed for an accurate project bid. Treat any cost database or planning tool as a reference, not a guarantee, and rely on written estimates for the actual work.

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How should I compare contractor estimates?

Compare the proposals line by line against a shared scope. If contractors have priced different work, the totals are not directly comparable. Ask each firm to clarify what is included, what is excluded, what assumptions it made, and what could change the price.

What to compare Questions to ask
Work and specifications Are demolition, installation, disposal, protection, cleanup, and all requested rooms included? Are materials specified by product or quality level?
Allowances and selections Which items are not selected? What amount is allowed for each, what does it cover, and who chooses or buys the item?
Exclusions and assumptions What work is excluded or dependent on an assumption about the home? What happens if that assumption proves wrong?
Permits and responsibilities Who obtains permits and schedules required inspections? Who handles deliveries, disposal, and coordination with other trades?
Schedule What are the estimated start and completion dates? What could delay the work, and how are changes to the schedule handled?
Payments What amount is due at signing, and which defined completed work triggers later payments?
Changes and warranty How must change orders be documented and approved? What warranty terms are stated in the proposal or contract?

Ask contractors to explain differences in scope, allowances, schedule, and payment terms before deciding. Do not treat a missing detail as an included service. Put clarified commitments in the agreement so the final contract, rather than a conversation or a rough estimate, states what each party expects.

How much should I set aside for unexpected renovation costs?

Set aside an amount that reflects the project’s uncertainty and your ability to absorb additional costs, but do not rely on a universal contingency percentage. The sources cited here support having a contingency, yet they do not establish one rate that works across renovation types, home conditions, or budgets. A project-specific professional can help identify likely risks, but an estimate cannot guarantee that every concealed condition will be known before work begins.

Consider how much is still unresolved. A defined scope with selected products and a well-inspected site may have fewer open assumptions than a project with undecided finishes, uncertain conditions, or substantial demolition. This is a way to think about risk, not a formula for calculating a precise reserve. Also consider what your household can pay without relying on money that is already committed to essential expenses.

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Keep the reserve distinct from money assigned to known work. If it is consumed by an approved change or an unexpected condition, update the remaining budget immediately. If the project does not need it, that does not mean it was wasted: it protected the plan against uncertainty rather than pre-authorizing optional upgrades.

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What should the renovation contract say?

Before work starts, use a clear written agreement. The FTC’s contractor guidance says it should identify the work included, cost, estimated start and completion dates, payment schedule, responsibility for permits, and the process for written change orders. Include the selected materials and product details where known. For items selected later, state the allowance and who is responsible for choosing them.

Review the contract for boundaries, not just the headline price. Confirm exclusions, assumptions, disposal and cleanup responsibilities, schedule expectations, and how the contractor will price and document additional work. A contract is more useful when it gives both sides a clear basis for deciding whether a proposed task is already included or is a separate change.

Authorize changes before extra work proceeds

A change order should state the added or revised work, its price effect, and its schedule effect. Ask for those details in writing, decide what the added cost means for the total and reserve, and approve or decline before the extra work proceeds. If you choose an upgrade, identify what it displaces or how you will fund it. If a newly discovered condition requires a decision, ask what happens if the work is deferred and what options are available.

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Written approval prevents a verbal conversation from becoming an unclear commitment. It also gives you a current record of the contract price and expected completion timing. The Houzz survey’s findings on higher-than-expected costs, higher-end selections, and scope expansion show why it is useful to distinguish necessary work from an optional change as the project evolves.

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How do I track spending during the renovation?

Keep one project record with the contract, estimates, approved change orders, product decisions, correspondence, payment records, and a log of calls and activities. The FTC recommends keeping these records. A notebook, spreadsheet, or project planner can all serve; the important part is that the record stays current and the documents can be found together.

A simple ledger can make commitments visible. This is a practical tracking method, not an FTC-prescribed form:

Ledger item What to record
Estimate The original proposal amount and the scope or assumptions it priced.
Contracted amount The signed price and payment milestones.
Approved changes Each written change order, including added or reduced cost and schedule effect.
Paid to date Payment amount, date, recipient, and the completed milestone it relates to.
Remaining commitment Unpaid contract work, approved changes, and any allowance amounts still unresolved.

Update the ledger when a change is approved and when a payment is made, not weeks later. Compare the revised committed total with the household ceiling before authorizing discretionary additions. Keep receipts and contractor communications with the related decision so you can trace how the budget changed.

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How should payments be staged?

Use a payment schedule tied to defined work completed, rather than paying the entire amount in advance. The FTC advises limiting the down payment and making progress payments contingent on completed work. Down-payment limits and other rules vary by state, so check the rules that apply where the renovation is taking place. Be cautious about pressure to pay everything upfront.

Make sure each milestone is concrete enough to verify—for example, a specified portion of work completed or an agreed installation phase—rather than a vague date. Keep proof of every payment and confirm how an unresolved issue affects the next milestone. Before final payment, inspect the work against the contract and agreed changes, and confirm that subcontractors and suppliers have been paid.

If financing is part of the plan, understand the total cost, interest rate and fees, repayment obligations, and any collateral risk before signing. The FTC also cautions homeowners to take care with a loan arranged by a contractor. Financing should not obscure whether the renovation’s total cost is within the household’s means.

A practical budget review before signing

  • Scope: The rooms, work, finish level, exclusions, and responsibilities are written down.
  • Estimates: Several written proposals price comparable work, and significant differences have been explained.
  • Selections: Chosen products are specified; unresolved items have clear allowances and decision responsibility.
  • Risk: A reserve is included based on the project’s uncertainties and household capacity, without assuming a universal percentage.
  • Contract: Cost, schedule, permits, payment milestones, and written change-order procedure are stated.
  • Tracking: A project record and ledger are ready to capture commitments, approvals, payments, and remaining costs.
  • Closeout: Inspection and confirmation of subcontractor and supplier payment are part of the final-payment plan.

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