Considering building a duplex & ADU on lot. (Should I walk away or get more creative?

Question

I’m evaluating a small multifamily new-construction opportunity in New Orleans and would appreciate your perspective on how you’d approach it, or whether you’d pass altogether. I’m intentionally pressure-testing the structure before committing further.

The deal involves a 31×110 infill lot (~3,400 sq ft)
zoned to allow a duplex by right, with an overlay that may support an accessory dwelling unit (ADU). The prior structure on the site was a single-story duplex that was demolished last year. The concept is a two-story front duplex (two 2bd/2ba units ~1,150 sq ft each) with a rear 1bd/1ba ADU (~600 sq ft) if approved.

Target blended rents are approximately $5,300–$5,800/month, depending on market vs. voucher mix. Estimated hard + soft construction costs are ~$580K–$600K, with closing and holding costs bringing total project exposure to roughly $680K, excluding land. The land is being structured creatively: the owner is deferring payment and would receive $50K on the back end, with no required monthly payments.

The intended exit is a DSCR refinance at ~75% LTV, with stabilized value penciling in the low-$700Ks, which should retire construction debt and cover the $50K land payoff.

Given all that, I’m curious how you would attack this:
– Would you simplify it (no ADU, different unit mix, or sell instead of hold)?
– Would you structure financing differently to reduce cash strain?
– Would you partner, re-trade terms, or pass and deploy capital elsewhere?

I’m less interested in forcing this deal to work and more interested in understanding how an experienced investor would evaluate, restructure, or walk away from it.

Deal numbers (quick snapshot)

• Lot      size: ~3,410 sq ft (31×110)
• Build      program: Duplex + possible ADU (3 units total)
• Total      build size: ~2,900 sq ft
• Build      cost: ~$580K–$600K (~$200–$210/sf)
• Closing      + holding costs: ~$85K–$95K
• Total      project exposure (ex-land): ~$680K
• Land      payout: $50K, deferred to exit
• Target      rents: ~$5,300–$5,800/month (blended)
• NOI      (approx.): ~$41K–$45K/year
• Stabilized      value: Low $700Ks
• Refi      assumption: 75% DSCR loan ≈ $540K
• Post-refi      equity: ~$160K–$190K

Monthly numbers

Total rent:

• $5,350      / month

Total monthly expenses (PITI):

• Mortgage      (P&I): ~$3,600
• Taxes:      ~$350
• Insurance:      ~$250
• Total      expenses: ~$4,200 / month

✅ Cash flow (rent − expenses)

$5,350 − $4,200 = +$1,150 per month

Patrick Roberts · Answer

Insurance estimates seem low for Louisiana and especially for Nola.

My bigger concern is that this is a lot of work and risk to break even on the value-add component. If everything goes according to plan, you will have invested $720k of capital, and will have a property worth approx that same amount. If anything goes wrong - construction delays or overruns, market changes, etc - you could easily be upside-down with this.

Since youre effectively paying fair market value, why not just buy something turnkey and avoid all of the construction risk? Is there any particular advantage to the location?

Michael Eskenasy · Answer

At a high level the structure is interesting, but what jumps out to me is how thin the margin is between total project cost and stabilized value.

You’re roughly at $680K all-in (ex land) with a projected value in the low $700Ks, which means most of the upside is being captured by the development risk rather than the investor.

A few thoughts I’d pressure-test before deciding whether to move forward:

1. The value spread is tight

Even if everything goes right, you’re only creating ~$40K–$60K of value on a project that requires full development execution. That’s not a lot of margin for construction overruns, delays, or rent assumptions missing slightly.

2. Construction estimates deserve scrutiny

$200–$210/sf for small infill construction is achievable in some markets, but these projects often creep once permitting, utilities, and site work start showing up. A 10–15% overrun would erase most of the projected equity.

3. The refinance assumptions matter a lot

If the exit value slips or DSCR underwriting tightens, the refi could come in lower than expected. That’s usually where these deals get uncomfortable.

4. The ADU might be the real lever

If the ADU is uncertain, I’d model the deal both ways. Sometimes simplifying to a clean duplex with stronger unit sizes produces almost the same rent with less construction risk.

Personally, when I look at development deals I want to see a wider spread between cost and stabilized value because the unknowns tend to stack up quickly.

So the key question isn’t really “can this work?” — it’s whether the risk/reward here is better than simply buying an existing asset with similar cash flow and far less execution risk.

If you can push the value up, lower build cost, or improve the financing structure, it might be worth getting creative. If not, this may just be one of those deals that looks clever on paper but doesn’t leave enough margin for the work involved.

Brandon Clark · Answer

@Patrick Roberts I hold the same sentiment. The more I ran the numbers the more riskier it seemed. I think the approach I will take is to wholesale it since it's 20k-25k less than other lots that have just sold in the same neighborhood. Thanks for the advice!

Landon Reid · Answer

Brandon, before the financial structure question, I'd pressure-test the buildability assumptions here because a 31x110 lot trying to fit a duplex AND an ADU is going to be tight on multiple fronts:

1. Setbacks vs. actual buildable area. On a 31-ft wide lot, side setbacks alone could eat 10+ feet depending on the zone. That leaves you working with ~20 ft of width for a two-story duplex plus a rear ADU. Run the actual setback math against the lot dimensions before assuming two 1,150 sq ft units fit.

2. The ADU overlay language matters. You said the lot "may support" an ADU. That's the key question to nail down first. In New Orleans, ADU rules vary by zoning district and can have specific lot size minimums, owner-occupancy requirements, and parking triggers. "May support" needs to become "confirmed by right" or this deal has a different risk profile.

3. Lot coverage and impervious surface limits. A duplex footprint plus ADU plus parking on 3,400 sq ft of lot area is going to push lot coverage limits hard. Check the max lot coverage percentage for your zone - if you're over, you're into variances, which means time, cost, and uncertainty.

4. Flood and drainage. New Orleans infill lots often sit in flood zones or have stormwater management requirements that affect where and how you can build, especially for new construction. If this parcel requires elevation, that changes your construction cost math significantly.

The financial model looks reasonable IF the buildability checks out. But I'd verify all of the above in about 20 minutes of focused research before spending another hour on the spreadsheet. The number of deals I've seen die because someone modeled the rent before confirming what the dirt actually allows is... a lot.

What zone is this parcel in specifically? Happy to think through the overlay question with you.

Brian Shon · Answer

@Patrick Roberts understood. Thanks Patrick

Patrick Roberts · Answer

Yeah I dont see where construction makes sense on this

Brian Shon · Answer

Please correct me if I'm wrong as I am a new real estate investor - To analyze if a deal like this is viable or not, would a 30% lift on the Stabilized Value be the indicator ?For example, If Stabilized value of this property was 884k would this project be viable for a refi out scenario?

Thanks for the detailed explanations Patrick & Michael.

Considering building a duplex & ADU on lot. (Should I walk away or get more creative?

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