How to Estimate Rehab Costs on a BRRR Property (Without Getting Burned)

BRRR investing is rewarding — but rehab estimation is where most new investors get burned. They walk through a property, do a rough mental tally of what needs to be done, and come up with a number that's 30–40% lower than what the project actually costs. By the time they're halfway through the renovation, they've blown their budget and their BRRR math no longer works.

This guide covers how experienced investors approach rehab estimation — using a component-by-component framework that produces accurate numbers instead of wishful thinking.

Why Accurate Rehab Estimates Are Critical for BRRR

In a BRRR deal, your rehab cost directly impacts how much capital you recover on the refinance. Every extra $10,000 of unplanned rehab costs is $10,000 you don't get back when you refinance — capital that stays trapped in the deal instead of being deployed into the next one.

Your rehab estimate also feeds directly into your maximum allowable offer (MAO). If you underestimate rehab by $20,000, you might offer $20,000 more than you should for a property. That overpay comes out of your equity — not the seller's.

The Component Approach to Rehab Estimation

The best investors don't estimate rehab as a single number. They break it down by component — each system or area of the house estimated separately — and then sum them up. This approach:

• Forces you to actually think through every scope item
• Makes it easy to spot what you missed
• Lets you build a detailed scope of work for contractor bids
• Gives you a baseline to hold contractors accountable to

Here's how to estimate each major component:

Kitchen

The kitchen is typically the highest-cost, highest-impact renovation in a BRRR property. Cost ranges depend heavily on scope:

• Light update (paint cabinets, new hardware, new countertops): $5,000–$10,000
• Mid-range renovation (new cabinets, granite/quartz countertops, new appliances, LVP flooring): $15,000–$25,000
• Full gut and rebuild (layout changes, custom cabinets, high-end finishes): $30,000–$50,000+

For most BRRR properties, the mid-range renovation delivers the best ROI. You're targeting B/B+ rental quality — solid and appealing, not luxury.

Bathrooms

Bathroom renovation cost depends on the number of bathrooms and the scope:

• Full bath light update (new vanity, toilet, fixtures, paint): $2,500–$5,000
• Full bath mid renovation (new tub/shower surround, tile floor, vanity, toilet): $6,000–$12,000
• Full bath gut (new everything including subfloor if needed): $10,000–$18,000
• Half bath: $1,500–$4,000 depending on scope

Budget separately for each bathroom. A property with 2 full baths and 1 half bath might run $18,000–$28,000 in bathroom renovations alone if all three need significant work.

Flooring

Flooring is one of the most transformative renovations in terms of visual impact per dollar. Costs to estimate:

• LVP (Luxury Vinyl Plank): $4–$7 per square foot installed
• Carpet (bedrooms only): $3–$5 per square foot installed
• Tile (bathrooms, entry): $8–$15 per square foot installed
• Subfloor repair: $2–$5 per square foot if needed (budget separately)

Measure total square footage, subtract fixtures/closets (typically 10–15%), and multiply by cost per square foot. A 1,200 sq ft home might have 1,000 sq ft of livable floor space — $4,000–$7,000 in LVP.

Paint (Interior and Exterior)

Interior and exterior paint are among the highest ROI improvements you can make:

• Interior paint (walls only): $1.50–$3.00 per square foot of livable space
• Interior paint (walls, ceilings, trim): $2.50–$4.00 per square foot
• Exterior paint (typical single family): $3,000–$7,000

A 1,500 sq ft home with full interior paint (walls, ceilings, trim) should budget $3,750–$6,000. Don't skip exterior — it's the appraiser's and tenant's first impression.

HVAC

HVAC is the most significant mechanical system cost in a rental property:

• Full HVAC replacement (3-ton unit, gas furnace + AC): $6,000–$12,000
• AC unit only: $3,000–$6,000
• Furnace only: $2,000–$4,000
• Ductwork repair/replacement: $2,000–$8,000 depending on scope
• Service and tune-up: $150–$400

Always have the HVAC inspected before closing. A 15-year-old unit that's still working should still be budgeted for replacement — the last thing you want is an emergency HVAC replacement in year one of your rental.

Electrical

Electrical costs vary enormously based on the age and condition of the property:

• Panel upgrade (100A to 200A): $1,500–$3,000
• GFCI outlets (kitchen/bath code compliance): $500–$1,500
• Knob-and-tube or aluminum wiring replacement: $8,000–$20,000+
• Smoke/CO detector installation: $300–$600
• General electrical repairs: $1,000–$3,000

Pre-1970 properties are particularly susceptible to electrical issues. Build in at least $2,000–$3,000 as an electrical contingency even if you don't see obvious issues — you often won't know until the walls are open.

Plumbing

Common plumbing scope items and costs:

• Water heater replacement: $800–$1,500
• Toilet replacements: $200–$500 each installed
• Kitchen/bath fixture replacement: $200–$600 per fixture
• Drain line repair/replacement: $1,000–$5,000
• Sewer line replacement: $5,000–$15,000 (always scope with camera if unknown)
• General plumbing repairs: $1,000–$3,000

For properties built before 1960, budget for galvanized pipe replacement — it's not a matter of if, it's a matter of when. The cost to replace galvanized supply lines in a 1,500 sq ft home runs $3,000–$6,000.

Roof

Roof condition is one of the first things a home inspector and appraiser will flag:

• Partial repair/patch: $500–$2,000
• Full roof replacement (asphalt shingles, 1,500–2,000 sq ft): $6,000–$12,000
• Full roof replacement with decking: $9,000–$15,000

If the roof is over 15 years old, budget for replacement regardless of apparent condition. A roof that's "fine" but 20 years old will be flagged by a conventional lender's appraiser and may cause issues on the refinance.

Windows and Doors

• Window replacement: $400–$800 per window installed
• Exterior door replacement: $600–$1,500 per door
• Interior door replacement: $150–$400 per door installed

Exterior and Landscaping

• Pressure washing: $300–$600
• Landscaping cleanup: $300–$800
• Driveway repair/reseal: $500–$2,000
• Fence repair or replacement: $1,500–$5,000

The Contingency Budget

This is the most important line item most investors skip. Always add 10–15% to your total estimated rehab as a contingency. Why? Because you will always find something unexpected once walls are open, floors are up, or the inspector goes through methodically.

A $40,000 rehab estimate should have a $4,000–$6,000 contingency built in. If you don't use it, great — that's extra equity. If you do need it, you won't blow your deal math.

How AI Tools Are Improving Rehab Estimates

The traditional approach to rehab estimation requires an experienced eye and a lot of time. You need to walk every property, assess each system, and mentally price out the scope before you can run your BRRR numbers.

AI-powered platforms like ARV Pilot are changing this by providing component-level rehab estimates as part of the deal analysis workflow — automatically. The system analyzes MLS listing data, infers property condition from descriptions and photos, and produces a detailed rehab estimate broken down by component (kitchen, baths, flooring, systems).

This doesn't replace the detailed contractor bid you'll get before closing — but it lets you quickly screen dozens of deals to identify which ones are worth a deeper look, without spending an hour on each one.

Putting It All Together

Here's a sample component budget for a typical 3/2 fixer in need of a full renovation:

• Kitchen (mid-range): $18,000
• Bathrooms (2 full): $16,000
• Flooring (LVP throughout): $6,000
• Paint (interior + exterior): $7,000
• HVAC replacement: $8,000
• Electrical updates: $3,000
• Plumbing updates: $2,500
• Roof (newer, no replacement): $0
• Windows (5 replacements): $3,500
• Exterior/landscaping: $1,500
• Contingency (12%): $7,900
• Total estimated rehab: $73,400

That's a full renovation. Many BRRR properties don't need all of this — but the component approach forces you to think through every system, which is exactly the discipline that separates investors who hit their numbers from the ones who don't.