How to Scope a Fix-and-Flip in Northern Colorado: What the Numbers Need to Look Like

The Fix-and-Flip Formula (And Why It Breaks Down)

The 70% rule is the starting point every new fix-and-flip investor learns: offer no more than 70% of ARV minus the estimated rehab cost. It's a useful filter for quickly eliminating deals that don't pencil. It is not a complete analysis, and investors who treat it as one get hurt.

The rule breaks down in several specific ways in Northern Colorado's current market. First, it doesn't account for holding costs — the ongoing expense of carrying the property while the rehab happens. In a market where rehabs routinely run 4–7 months due to permit timelines and contractor availability, those costs are real. Second, it doesn't account for the variance in rehab estimates. A $40,000 rough scope that turns into a $62,000 actual spend — which happens on older properties with deferred maintenance — shifts the entire deal math. Third, it doesn't account for the I-25 corridor's current market dynamics, where absorption times for renovated properties vary significantly by submarket and price range.

The 70% rule tells you whether to keep looking at a deal. The detailed pro forma tells you whether to buy it.

"The flip formula gets you to the right zip code. The scope of work tells you whether you're actually standing in a deal or just a distressed house."

ARV Estimation in Northern Colorado's Current Market

After-repair value is the number everything else is built on, which makes it the most important and the most commonly misestimated figure in a flip analysis.

ARV is not the Zillow Zestimate. It's not the highest price a comparable sold for in the last 12 months. It's the realistic market value of the property — in its fully repaired condition — based on recent, comparable, actively transacting sales within a tight radius.

In Northern Colorado's current market, ARV estimation requires attention to several submarket-specific factors:

Neighborhood ceiling: Erie's subdivisions like Compass and Colliers Hill have strong comps in the $520,000–$650,000 range for renovated 3-4 bed single-family. Longmont's older northeast and southeast quadrants trade significantly lower — $380,000–$450,000 for similar square footage. Applying Erie comps to a Longmont acquisition is the single most common ARV error investors make.

Days on market by price range: Northern Colorado's market has stratified by price point. Properties under $450,000 in good condition are moving in under 30 days. Properties in the $500,000–$600,000 range are sitting 45–75 days. This matters for your holding cost calculation.

Condition premium vs. comparable: A fully renovated flip in a neighborhood of aging inventory commands a real premium. A flip where competitors are also actively renovating compresses that premium. Know what's under contract on your street before you finalize ARV.

Use a licensed appraiser's opinion before closing on a flip acquisition. The $400–$550 appraisal fee is cheap insurance against an ARV miscalculation that costs you $30,000.

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Holding Costs: The Silent Profit Killer

Holding costs are the flip expenses that are invisible during the acquisition analysis and very visible on the settlement statement. They include:

Financing costs: Hard money or private lending on fix-and-flip acquisitions typically runs 8–12% interest plus 1–3 origination points. On a $300,000 purchase with a $50,000 rehab budget, you're carrying $350,000 for the hold period. At 10% interest on a 5-month hold, that's $14,580 in interest alone.

Property taxes: Larimer and Weld county property taxes on a $350,000 property run approximately $2,100–$2,800 annually — about $175–$235/month you're paying while the rehab proceeds.

Insurance: Builder's risk or vacant property insurance for a property under renovation runs $100–$250/month.

Utilities: Keeping heat and power on during construction runs $80–$200/month in a Northern Colorado winter.

HOA fees: If the property is in an HOA — common in Erie's planned communities — you're paying dues from day one. Don't forget to check.

Add it up: a 5-month hold on a $350,000 acquisition with hard money financing costs $18,000–$22,000 in holding costs before you sell. That's real money that needs to be in your pro forma before you make the offer.

The implication: timeline matters enormously. A rehab that runs 3 months instead of 6 months saves $6,000–$8,000 in holding costs. Contractor reliability and permit timeline management aren't conveniences — they're profit items.

What Buyers in Your Price Range Actually Want

Exit strategy is the third leg of the flip analysis. You're building for a specific buyer in a specific price range in a specific submarket, and that buyer has preferences that should drive your renovation decisions.

Under $400,000 in Longmont or Greeley: This buyer is often a first-time homeowner or downsizer. They need functional, clean, and move-in ready. They are sensitive to price. They will not pay a premium for granite if they can get LVP countertops and stay $15,000 lower. Prioritize: new flooring, painted cabinets, clean landscaping, functional HVAC.

$450,000–$550,000 in Erie, Windsor, or Loveland: This buyer is comparing you to new construction. They expect quartz countertops, stainless appliances, and a primary bath that doesn't feel dated. They're buying a renovation, not a project. Prioritize: full kitchen update, primary bath tile shower, fresh exterior.

$550,000+ in Fort Collins or East Boulder County: This buyer has options. The renovation needs to be genuinely high quality — LVP flooring throughout, full kitchen renovation, both bathrooms updated, clean and inviting outdoor space. Shortcuts will kill the appraisal gap and sink your ARV estimate.

One principle applies across all price ranges: don't leave deferred maintenance visible. A fresh kitchen in a house with a cracked driveway, missing fascia board, and a roof that needs replacement will not appraise at ARV. Buyers and appraisers see the whole property. Address the structural and mechanical before you spend money on cosmetics.

Updated on: 29/04/2026