Know more about every property than the person across the table. The property analyst for Fairfield County

Builbi reads every lot, deed, listing, permit and town rule in fourteen Fairfield County towns, every night, and answers any question about any house in plain words. Agents, builders and investors use it to get there first.

Builbi is by request. We set up each firm ourselves and keep the number in each town small. Already a member? Sign in

Get your afternoons back.

Today one real question about one house means the assessor site, the land records, the town’s GIS and a wetlands map, and an hour is gone. Ask Builbi instead and the whole file is open before you finish typing: the lot drawn on the aerial, the owner and how long they’ve held, every sale on the street, the flood line, and the town’s rule with its section number. From your desk, from your phone on the street, or inside the Claude or ChatGPT you already have open.

Ask anything, or type an address
14 Dogwood Ln
Compo South, Westport · 2.22 ac, AA zone · one family since 1972, held in trust
$2.37Mwhat a family would pay
$2.03Mwhat a builder would pay
Two real buyers. Market it to both: the builder bid puts a floor under the price even if the house shows its age.
The sales behind the number
6 Over Rock Ln
$3.15M6 Over Rock Ln0.18 mi · Dec 2025
11 Dogwood Ln
$2.34M11 Dogwood Ln0.06 mi · Nov 2025
5 Over Rock Ln
$2.01M5 Over Rock Ln0.17 mi · Mar 2026
What builders paid for lots like this one
  • 11 Dogwood LnDogwood Partners LLC · off-market · May 2026$2.34Mnow listed as a 9,100 sf new build
  • 5 Over Rock Ln5 Over Rock Lane LLC · from an estate · Mar 2026$2.01M
  • 9 Over Rock Lnan LLC · off-market · 2024$1.5Ma 9,200 sf new build on the market now
30 secondswith
All daywithout Builbi · six sites, then the comps by hand
Builbi's answer on a phone
30 secondswith
7 tabs · Tuesday
gis.vgsi.com
westportct.gov
cteco.uconn.edu
fws.gov
msc.fema.gov
westportct.gov
Smart MLS
All daywithout Builbi

Know it all, wherever you’re standing.

You’re out with a client, you pass a house, and you wonder. Tap the pin and Builbi puts you on the map right where you stand, every lot around you drawn. Tap any house and you have the owner, how long they’ve held it, what it’s worth, the lot and the street’s sales, before you’ve finished the thought. On the go, in the car, at the curb: you still know it all.

Builbi on a phone: the Westport Explore map with the pin-my-location control at the top right of the map.
1 You’re in the car with a client. Tap the pin.
The map has flown to the phone's own position: a blue dot on the aerial with every parcel line around it.
2 You’re on the map, every lot around you drawn.
A tap on the house next door opens its card: 32 Minute Man Hill, Compo Beach, two bedrooms, 2,213 square feet on an acre, a $3.44M market estimate.
3 Tap the house you just passed.
The property page for 32 Minute Man Hill on the phone: the lot analysis on the aerial, the house photo and the Brief.
4 Owner, hold, value, lot and the street’s sales, before the next light.

Find the deal before it’s a listing.

Today you learn a house is coming to market when it hits the feed, with everyone else. Builbi reads the signals a month earlier: the estate opened, the tax lien recorded, the divorce filed, the owner who has mailed from Florida for twenty years. Every house in town is ranked by who is likely to move next, and every reason is sourced to a record you can open. Builders get the same read on every lot that pencils as a teardown. Flippers get it on every house that pencils as a flip.

ESTATEABSENTEE TAX LIENLONG HOLD LLC ENTRYDIVORCE
Builbi's answer to which Darien homes are likely to sell in the next year: 208 properties pinned across the town on the map, clustered by street, beside the answer that says why each kind of owner is on the list.Builbi's answer to which Darien homes are likely to sell in the next year: 208 properties pinned across the town on the map, clustered by street, beside the answer that says why each kind of owner is on the list.
“Which Darien homes are likely to sell in the next year? Put them on a map.” — 416 homes in the model’s top two tiers, the 208 strongest pinned across the town. No owner named.
4 Grist Mill Ln: the property header with its appraisal, expected spread and fit score over the lot map with the buildable envelope drawn.4 Grist Mill Ln: the property header with its appraisal, expected spread and fit score over the lot map with the buildable envelope drawn.

For builders: every lot that pencils.

Every single-family lot in fourteen towns, scored on whether you can buy it, tear it down and build new at a profit: the price to pay, the spread after every cost, and the house the lot really allows.

The Fairfield flip map: thousands of Strong and Workable renovate-and-resell candidates.The Fairfield flip map: thousands of Strong and Workable renovate-and-resell candidates.

For flippers: every house that pencils.

Ten years of real flips in each town set the entry, the premium and the hold. Every house is graded Strong, Workable or Thin, and the one a builder will outbid you for is called out before you spend a weekend on it.

Say the number and mean it.

Today a value is a feeling backed by three comps you picked. Every number Builbi gives you traces to a real sale, a real deed or a real bill, screened the way a good appraiser screens: the same lot class, the same kind of road, the closest and most recent first. You see what builders actually paid for the dirt, not what they’d tell you. When a client pushes back, you open the record.

What Builders Paid Nearby: nearby lots builders bought and tore down, with price paid, distance, lot size and whether the sale was off-market.What Builders Paid Nearby: nearby lots builders bought and tore down, with price paid, distance, lot size and whether the sale was off-market.
What builders paid for the lots like this one, each with the buyer, the distance and whether it was ever listed.
Westport builder-activity heat map: every street-level cluster coloured by where builders are buying right now.Westport builder-activity heat map: every street-level cluster coloured by where builders are buying right now.
Where builders are buying this year, street by street. Builders separated from ordinary buyers.

Know what the street is worth, not just the house.

Every parcel in the fourteen towns: lot lines, owner of record, value, sales history and the full dossier a click away. Switch on micromarkets and the town becomes hundreds of street-level price pockets built from ten years of closings, each with its own $/sf, its trajectory, and the builders buying inside it. The number you quote comes from the street’s own sales, not the town median.

Explore: Westport in 3D with micromarket clusters colored by price per square foot, the Peaceful Ln cluster opened to its $771/sf, ten-year trend and the parcels inside it.
What it reads, every night
Statewide assessorAssessor field cardsTown deed records Off-market salesClosings, actives and pendingsDemolition notices Probate courtObituariesRecorded mortgages Judicial docketsTax collectorProperty tax bills Parcel polygonsWetlands and the review bandFEMA flood LiDAR terrain and footprintsSewer mapZoning tables Wetland regulations by sectionCommission minutesEasements Traffic and power linesCemetery adjacencyBusiness registry

Walk in with the document already made.

Today the CMA is tonight’s work. Ask for it and a seller CMA, a buyer CMA or a Builder Property Evaluation is written from the same record in minutes, with your name, your firm and your logo, and opens as a page the client reads on their phone. The weekly market report answers “what’s the market doing?” before they ask.

SELLER CMABUYER CMA BUILDER EVALUATIONMARKET REPORT
The cover of a Builder Property Evaluation for 4 Grist Mill Ln: the firm's mark, the title, the lot and zone line, and the listing photograph.

Builder Property Evaluation

For a builder client, or handed to the lender. 4 Grist Mill Ln, Westport.

The cover of a buyer's CMA for 22 Evergreen Ave: the firm's mark, the title, prepared for a buyer client, the asking price and the listing photograph.

Buyer CMA

For the client writing the offer. 22 Evergreen Ave, Westport, asking $4.85M.

The cover of the Westport market report for builders: the firm's mark, the title, the week's finding and four headline numbers.

Market report

For the client who asks what the market is doing. Westport, this week.

Hand your client the market read before they ask for it.

A report per town, rewritten every week for four seats: buyers, sellers, builders and flippers. Headlines that state the finding, the numbers behind them, and the neighborhood where it matters. Free to read, and shareable with a client as a page. Read this week’s Westport report for buyers →

Market: the Westport Builders report, a headline stating the finding over the median lot price, build gross and land multiple.

Be the one who already knew.

Builbi rebuilds every town every night. The estate, the lien, the new permit and the price cut show up the week they happen, not the month after, and the whole town is re-ranked by morning. Over a year, that is a few hundred conversations you start first.

Scored parcels across Darien.Scored parcels across Darien.
Darien
Scored parcels across Easton.Scored parcels across Easton.
Easton
Scored parcels across Fairfield.Scored parcels across Fairfield.
Fairfield
Scored parcels across Greenwich.Scored parcels across Greenwich.
Greenwich
Scored parcels across New Canaan.Scored parcels across New Canaan.
New Canaan
Scored parcels across Newtown.Scored parcels across Newtown.
Newtown
Scored parcels across Norwalk.Scored parcels across Norwalk.
Norwalk
Scored parcels across Redding.Scored parcels across Redding.
Redding
Scored parcels across Ridgefield.Scored parcels across Ridgefield.
Ridgefield
Scored parcels across Stamford.Scored parcels across Stamford.
Stamford
Scored parcels across Trumbull.Scored parcels across Trumbull.
Trumbull
Scored parcels across Weston.Scored parcels across Weston.
Weston
Scored parcels across Westport.Scored parcels across Westport.
Westport
Scored parcels across Wilton.Scored parcels across Wilton.
Wilton

Assessor records nightly. Listings three times a day, closings and flips daily. Deeds, probate and demolition notices weekly. The statewide roll quarterly, and the whole town rescored whenever something material moves.

Read the land before you walk it.

Know what you’re driving to before you see it. One-foot contours drawn over the same aerial as the wetlands, the flood line and the buildable envelope tell you whether the lot is one big cliff, a flat pasture, or has water on it in a good way or a bad way. The grade that needs retaining walls and the wet corner that eats the back yard show up from your desk, so you walk a property already knowing what it is.

1-FT CONTOURS WETLANDS + BUFFER BUILDABLE ENVELOPE SLOPE & GRADE

Membership is by request.

We add a small number of firms in each town and set each one up ourselves. Tell us who you are and where you work, and we’ll write back with access and pricing for your firm.

Every lotEvery parcel in fourteen towns with lot lines, owners and sale history; search and filters across all of it; flood, wetland and terrain layers; and the weekly market reports.
The analystAsk any question about any house, street or town and get an answer built from the record, with the sales and filings it used.
DocumentsBuyer and seller CMAs and builder evaluations with your name, firm and logo, ready to send to a client.
Your teamClient folders you share with the people you work with, and the analyst in Claude, ChatGPT or wherever you use AI.
We reply from hello@builbi.com. Already a member? Sign in.

Know more. Get there first.

Builbi is for agents, builders, buyers, flippers and investors across Fairfield County. Membership is by request. Tell us who you are and we’ll write back with access and pricing for your firm. Questions: hello@builbi.com.