Mendon · build cost

What it costs to build a house in Mendon, NY

A standard-finish house in Mendon runs about $204–268/sq ft all in, which on a 1,800 sq ft build works out to roughly $370k–480k with general-contractor margin already in it. The part people leave out is what you pay before that, because the smallest conforming residential lot in the Town of Mendon is 0.6887 acres and vacant land here carries a median assessed value of $12,322 an acre, so the dirt alone is around $8,486 and the whole thing lands near $375k–490k. What the code will let you put on that lot is rarely the binding constraint, since even Residential Suburban 30 (RS-30) — a density of 1 LOT PER 30,000 SQUARE FEET (0.69 acres), the town's smallest-lot district and the ONLY district in Mendon where any additional density is available. Lot width 50 ft at the right-of-way and 100 FT AT THE BUILDING LINE (the recorded figure). Front setback 60 ft on town and county roads and 80 ft on a state road; SIDE 15 FT — the only district that departs from the town-wide 20 ft side yard; rear 20 ft; height 2 1/2 stories or 35 feet. RS-30 IS THE ONLY MENDON DISTRICT THAT STATES A LOT COVERAGE AND IT IS RECORDED: 25% of the lot. The schedule's shared column reads '1 story: 1,000 ~ Other: 1,200 ~ 25% coverage of lot', so RS-30 carries BOTH a minimum habitable floor area (1,000 sf one-storey, 1,200 sf otherwise — lower than the RA districts' 1,200/1,500) AND a genuine 25% coverage ceiling. Every other district in the town gives floor area only, which is why their coverage is null; do not read those nulls as a missing 25%. EVERY ROUTE TO A SECOND UNIT IN MENDON IS CONCENTRATED HERE, all by Planning Board special use permit under Article VII: RESIDENTIAL CONVERSIONS (the town's de facto ADU, available in no other district), apartment houses, townhouse clusters, multiple-dwelling units and dwelling groups, condominiums and cooperatives, plus tourist homes and bed-and-breakfast establishments., the tightest residential district here, allows a building footprint of roughly 7,500 sq ft on a conforming lot, which is more house than the budget above actually buys. The figures below come out of the same cost engine Aldo uses to price a real parcel, broken out by system and by what a harder site adds, so you can see where the money actually goes.

Land plus build: the real number in Mendon

Build cost is the half everyone quotes. The other half is the lot, and in the Town of Mendon the code will not let you build on less than 0.6887 acres in its most permissive residential district, so that is the smallest ticket into the town.

Land is roughly 2% of that total in Mendon. The per-acre figure is the median assessed full market value of vacant residential land across 192 priced parcels here, which is a proxy for what dirt is worth and not an asking price - road-frontage lots that are ready to build on trade above it, and back land without access trades below.

Cost per square foot by finish level

All in, general-contractor margin included, for a slab-on-grade build on a flat and clear lot. The rate holds steady whether you build 1,200 or 2,500 sq ft, which is why the finish level moves a budget more than the size does.

Where the money goes

A standard-finish build at Monroe County pricing, broken out by trade as dollars per square foot. Foundation and site work here are the slab and flat-lot baseline, so a harder site stacks on top of them.

What moves the number

The baseline assumes the easy case. Each of these stacks on top, per square foot, at Monroe County pricing:

• Crawlspace instead of slab+$13–20/sq ft
• Full basement instead of slab+$31–49/sq ft
• Moderately sloped or wooded lot+$8.7–16/sq ft
• Steep or ledge-rock site+$22–44/sq ft
• Winter foundation & site work+$2.8–4/sq ft

Whole-project totals

Standard finish, slab on a flat lot, all in and before land. A harder site or a higher finish moves these up.

How much house Mendon actually lets you build

Every residential district caps how much of the lot the building can cover. Multiply that cap by the district's minimum lot size and you get the largest footprint the code permits on a conforming lot in the Town of Mendon, which runs from about 7,500 sq ft in Residential Suburban 30 (RS-30) — a density of 1 LOT PER 30,000 SQUARE FEET (0.69 acres), the town's smallest-lot district and the ONLY district in Mendon where any additional density is available. Lot width 50 ft at the right-of-way and 100 FT AT THE BUILDING LINE (the recorded figure). Front setback 60 ft on town and county roads and 80 ft on a state road; SIDE 15 FT — the only district that departs from the town-wide 20 ft side yard; rear 20 ft; height 2 1/2 stories or 35 feet. RS-30 IS THE ONLY MENDON DISTRICT THAT STATES A LOT COVERAGE AND IT IS RECORDED: 25% of the lot. The schedule's shared column reads '1 story: 1,000 ~ Other: 1,200 ~ 25% coverage of lot', so RS-30 carries BOTH a minimum habitable floor area (1,000 sf one-storey, 1,200 sf otherwise — lower than the RA districts' 1,200/1,500) AND a genuine 25% coverage ceiling. Every other district in the town gives floor area only, which is why their coverage is null; do not read those nulls as a missing 25%. EVERY ROUTE TO A SECOND UNIT IN MENDON IS CONCENTRATED HERE, all by Planning Board special use permit under Article VII: RESIDENTIAL CONVERSIONS (the town's de facto ADU, available in no other district), apartment houses, townhouse clusters, multiple-dwelling units and dwelling groups, condominiums and cooperatives, plus tourist homes and bed-and-breakfast establishments. to 7,500 sq ft in Residential Suburban 30 (RS-30) — a density of 1 LOT PER 30,000 SQUARE FEET (0.69 acres), the town's smallest-lot district and the ONLY district in Mendon where any additional density is available. Lot width 50 ft at the right-of-way and 100 FT AT THE BUILDING LINE (the recorded figure). Front setback 60 ft on town and county roads and 80 ft on a state road; SIDE 15 FT — the only district that departs from the town-wide 20 ft side yard; rear 20 ft; height 2 1/2 stories or 35 feet. RS-30 IS THE ONLY MENDON DISTRICT THAT STATES A LOT COVERAGE AND IT IS RECORDED: 25% of the lot. The schedule's shared column reads '1 story: 1,000 ~ Other: 1,200 ~ 25% coverage of lot', so RS-30 carries BOTH a minimum habitable floor area (1,000 sf one-storey, 1,200 sf otherwise — lower than the RA districts' 1,200/1,500) AND a genuine 25% coverage ceiling. Every other district in the town gives floor area only, which is why their coverage is null; do not read those nulls as a missing 25%. EVERY ROUTE TO A SECOND UNIT IN MENDON IS CONCENTRATED HERE, all by Planning Board special use permit under Article VII: RESIDENTIAL CONVERSIONS (the town's de facto ADU, available in no other district), apartment houses, townhouse clusters, multiple-dwelling units and dwelling groups, condominiums and cooperatives, plus tourist homes and bed-and-breakfast establishments.. Worth checking before you assume zoning is what is limiting the house, because in most districts it is the budget that runs out first.

Footprint is the ground-floor building area, so a second storey buys floor area this number does not constrain, subject to the height limit. Some municipalities write their coverage cap as impervious surface rather than building coverage, which counts the driveway, walks and patio against the same budget and leaves less of it for the house - check which one your district uses before you design to it.

Local rules that move a build budget in Mendon

• UtilityRG&E territory. Service run and connection cost depends on distance to the line, which on a rural parcel can be the single largest site expense.
• Short-term rentalsShort-term rentals allowed with registration. MENDON HAS A FULL STANDALONE SHORT-TERM RENTAL LAW WITH AN OPERATING PERMIT, AND IT IS NOT IN THE ZONING CHAPTER — Ch. 208 Short-Term Rentals, §§ 208-1 to 208-16 (guid 42871418, ~32,000 characters, 14 sections). THIS IS THE SECOND CONFIRMED INSTANCE OF THE GATES Ch. 148 PATTERN IN MONROE and it is the reason the whole-code sweep is mandatory: a search of Mendon's Ch. 260 Zoning alone returns nothing for short-term rental and would have produced a false 'no regime' finding. § 208-5 REQUIRES A REVOCABLE SHORT-TERM RENTAL OPERATING PERMIT before a property may be used as an STR at all, granted 'in accordance with the Schedule of Zoning Districts' at § 208-6 — so WHICH DISTRICTS PERMIT AN STR IS SET BY THAT SCHEDULE. Permit mechanics: a NEW permit is valid for a maximum of ONE year and a RENEWAL for a maximum of TWO; all permits expire 31 December of the relevant calendar year regardless of when issued; renewals are filed at the Town of Mendon Building Department and must be received by 1 DECEMBER or the application is treated as new; and THE PERMIT IS NONTRANSFERABLE, so a purchaser of an operating STR must apply afresh and cannot rely on the seller's permit — a material diligence point on any Mendon acquisition premised on rental income. § 208-7 sets property standards that are life-safety rather than dimensional: full compliance with the NYS Uniform Fire Prevention and Building Code and the Town Code with any pre-existing deficiencies corrected BEFORE issuance, a working smoke detector in every sleeping room plus one per floor, carbon monoxide detectors, evacuation procedures posted in each sleeping room and in the kitchen and main living room, and portable fire extinguishers on each floor and in the kitchen under NY Fire Code § 906 with an inspection record produced at application. §§ 208-10 to 208-13 carry compliance, penalties, suspension and revocation, renewal and appeals. SEPARATELY AND NOT THE SAME THING, the zoning chapter permits TOURIST HOMES AND BED-AND-BREAKFAST ESTABLISHMENTS by SPECIAL USE PERMIT from the Planning Board, but only in RA-5 and RS-30 — not in RA-2 or RA-1. A bed-and-breakfast is an owner-present lodging use on a different track from the Ch. 208 STR permit and the two should not be conflated. New York State's 2025 statewide short-term rental registry (Ch. 99 of the Laws of 2025) obliges every host to register in addition to the Town permit. Confirm with the Building Department at (585) 624-6066.
• Districts mapped4 zoning districts in the Town of Mendon.
• Building dept(585) 624-6066
• Zoning last reviewed2026-08-13

Building an accessory unit instead?

An 800 sq ft ADU in Mendon runs about $200k–260k, and the per-square-foot rate is higher than a full house because the kitchen, bath, panel and heating plant cost the same either way. See what it costs to build an ADU in Mendon, priced by size.

Cost to build in nearby towns

All Monroe County towns: Rochester (City) · Brighton · Chili · Clarkson · Gates · Greece · Hamlin · Henrietta · Irondequoit · Ogden · Parma · Penfield · Perinton · Pittsford · Riga · Rush · Sweden · Webster · Wheatland · Town/Village of East Rochester (Village) · Brockport (Village) · Churchville (Village) · Fairport (Village) · Hilton (Village) · Honeoye Falls (Village) · Pittsford (Village) · Scottsville (Village) · Spencerport (Village) · Webster (Village)

More on Mendon: Zoning for new construction · ADU rules · Monroe County build cost

Cost to build in Mendon: common questions

Construction figures are modeled estimates from Offsite's cost engine in current 2026 dollars, general-contractor margin included, using the Monroe County regional index. They are planning numbers for decision-support only - not a bid, quote, or guarantee, and not architectural or engineering advice. Zoning figures for the Town of Mendon come from the municipal code (last reviewed 2026-08-13) and can carry district exceptions and overlays this page does not show. Actual cost depends on the specific parcel, design, site conditions and market at the time you build; verify with the building department at (585) 624-6066 and get a real estimate before you commit. Sources: Offsite / Aldo cost engine (costEngine.js + constants.js); zoning dataset (municipalData.js) ; NYS statewide tax-parcel layer, vacant residential full market value per acre.