How much should you spend on a renovation vs. your home's value?
Almost every renovation question eventually collapses into one: how much is too much? Spend too little and you leave a room half-finished; spend too much and you pour money into a house that will never reflect it back at resale. The most useful anchor isn't a flat dollar figure — it's a percentage of what your home is actually worth today. That single ratio keeps your budget tethered to the one thing the market cares about.
The one-line version: budget each project as a share of your home's current value — roughly 5–10% for a kitchen or bathroom, and no more than about 30% across every renovation combined. Above those lines, each extra dollar returns less and less.
Why a percentage beats a dollar figure
A $40,000 kitchen is lavish in a $250,000 home and modest in a $1.2m one. The same spend that adds value in one market destroys it in another, because resale value is set by comparable homes, not by your invoice. Pegging the budget to a percentage of value bakes that local reality in automatically: it scales the ambition of the project to the price band your buyers are actually shopping in. It's also how appraisers and agents think, which is exactly whose judgement decides what you get back.
The room-by-room benchmarks
These are the ranges most widely cited by remodeling and real-estate sources. Treat them as guardrails, not targets — the right number inside each band depends on your finish level and how long you plan to stay.
- Kitchen — 5–15% of home value (aim for the 5–10% end if you're renovating to sell). A minor, cosmetic kitchen refresh recoups far more per dollar than a full gut renovation, so spending less often returns more.
- Bathroom — 5–10% of home value. A midrange bathroom remodel is one of the higher-returning interior projects; a bathroom addition costs far more and recoups a smaller share, so it eats the budget faster.
- Any single project — be cautious past 10–15%. Once one project crosses roughly 10–15% of your home's value, you're increasingly likely to be spending above what the local market will support — see how to avoid overcapitalising.
- All renovations combined — the 30% ceiling. A common rule of thumb caps total spend across every project at about 30% of your home's current value. It's a blunt instrument, but it's a useful hard stop when a whole-home plan starts to sprawl.
What those percentages look like in dollars
The same rule produces very different budgets depending on your home's value. Find the row closest to your home to see the ballpark each guideline implies.
| Home value | Kitchen (5–10%) | Bathroom (5–10%) | Single-project caution (10–15%) | Total ceiling (30%) |
|---|---|---|---|---|
| $200,000 | $10,000–$20,000 | $10,000–$20,000 | $20,000–$30,000 | $60,000 |
| $350,000 | $17,500–$35,000 | $17,500–$35,000 | $35,000–$52,500 | $105,000 |
| $500,000 | $25,000–$50,000 | $25,000–$50,000 | $50,000–$75,000 | $150,000 |
| $750,000 | $37,500–$75,000 | $37,500–$75,000 | $75,000–$112,500 | $225,000 |
| $1,000,000 | $50,000–$100,000 | $50,000–$100,000 | $100,000–$150,000 | $300,000 |
Ranges are planning guardrails, not appraisals. The calculator does this automatically — enter your home's value alongside a project and it flags what percentage of your home's worth you're about to spend.
The ceiling that overrides every percentage
There's one limit that trumps all the rules above: the neighbourhood ceiling. Every street has a price above which homes simply don't sell, no matter how good the finishes are. A widely used guideline is that your home's value after the work shouldn't push much past 110–120% of the median comparable sale nearby. If a renovation would lift your home above that ceiling, the market won't follow it up — that's the money that quietly disappears in improvements that don't add value. National cost data (which we use as our baseline) can't see your street; a local agent pulling three recent comps can, and it's the single most valuable check you can run before signing anything.
A worked example
Say your home is worth $400,000 and the recent comparable sales on your street top out around $460,000. The percentage rules give you a kitchen budget of roughly $20,000–$40,000, a bathroom around $20,000–$40,000, and a total renovation ceiling near $120,000. But the neighbourhood ceiling is the tighter constraint: with only about $60,000 of headroom to the top comparable, a $120,000 whole-home overhaul would lift your home's value well past what any buyer on the street will pay. In practice you'd prioritise — perhaps a kitchen remodel plus a curb-appeal refresh — and stop well before the 30% figure, because the ceiling, not the percentage, is what caps your return here. This is the everyday case where the two rules disagree, and the ceiling always wins.
Finish level is where budgets quietly blow past the band
The same project can sit comfortably inside 8% of your home's value at a balanced finish and sail past 15% at a statement finish — while recouping a smaller share of that larger number. Our calculator models this directly: choosing Luxury finish or Statement renovation raises the cost multiplier substantially and lowers the expected resale recovery, because buyers rarely pay full price for finishes that exceed what's normal for the neighbourhood. If your budget keeps drifting upward, it's almost always the finish tier, not the project itself.
Spending to stay vs. spending to sell
If you're selling within a couple of years, stay at the lower end of every band and favour broadly appealing, high-recoup work — see which improvements add the most value. If you're staying long term, the percentages matter less: spend on the rooms you actually live in, just go in knowing the resale math so a lifestyle project doesn't masquerade as an investment. Either way, the percentage-of-value frame keeps the decision honest.
See what your budget means before you spend it
Enter your home value and a project to get the percentage of value, estimated cost, and how much typically comes back at resale.
Calculate My Reno ROI →Frequently asked questions
What percentage of my home's value should I spend on a renovation?
As a rule of thumb, budget each individual project as a share of your home's current value — roughly 5–10% for a kitchen or bathroom — and keep your total spend across all renovations under about 30% of the home's value. These percentages scale the project to the price band your buyers are shopping in, which is what ultimately sets resale value.
What is the 30% rule for renovations?
The 30% rule says you shouldn't spend more than about 30% of your home's current market value on renovations in total. On a $400,000 home that's roughly a $120,000 ceiling across every project combined. It's a blunt guardrail against over-improving, not a target to aim for.
How much should I spend on a kitchen or bathroom remodel?
Most remodeling and real-estate sources put a kitchen at 5–15% of home value (5–10% if you're renovating to sell) and a bathroom at 5–10%. A minor, cosmetic refresh usually recoups a far higher share of its cost than a full gut renovation, so spending toward the lower end of the band often returns more per dollar.
What is the neighbourhood ceiling, and why does it matter more than the percentage?
The neighbourhood ceiling is the price above which homes on your street simply don't sell, regardless of finish quality. A common guideline is that your home's value after the work shouldn't push much past 110–120% of the median comparable sale nearby. When the ceiling and the percentage rules disagree, the ceiling wins — any spend that lifts you above it isn't reflected back at resale.
Does spending more on a renovation always add more value?
No. Beyond the percentage bands and the neighbourhood ceiling, each extra dollar returns less — and upscale finishes typically recoup a smaller share than midrange ones. Past a point you're buying lifestyle, not resale value, which is fine as long as you know which one you're paying for.
Methodology & sources
Percentage guidelines reflect commonly cited remodeling and real-estate rules of thumb: roughly 5–10% of home value for a kitchen or bathroom (5–15% at the outer edge for kitchens), caution above 10–15% for any single project, and an approximate 30% cap on total renovation spend. The neighbourhood ceiling (post-renovation value staying within ~110–120% of local median comparables) is a general appraisal principle, not a fixed figure. These are planning benchmarks for US/UK/Canada/Australia/NZ mid-markets, not appraisals, quotes, or financial or real-estate advice. Always confirm against local comparable sales. See our full methodology. Reviewed by the Return on Reno research team, August 2026.
Last reviewed: August 2026 · Return on Reno