Underbuilt-Lot & Teardown Screener
The best redevelopment plays are hiding in plain sight: small, older homes on lots zoned for far more house than sits on them today. This screener scores active Silicon Valley listings against each city's floor-area limit to surface the most underbuilt lots MLS filters never show.
Envelope vs. Existing
We estimate each city's allowable floor area from its zoning rule and compare it to the existing home to measure unused headroom.
Expansion Upside
Low utilization on a sizable lot means room to add square footage — or, for older homes, a scrape-and-rebuild.
Sourced & Conservative
FAR rules are curated per city with code citations; uncurated cities use a flagged conservative estimate, never a false signal.
Most Underbuilt Listings
Filters
Zoning & Risk
$4,795,000
144 Alta Mesa Rd, Woodside
$1,688,000
143 Bonita Ave, Redwood City
$4,995,000
519 Central Ave, Menlo Park
$2,988,000
811 Paulson Cir, Menlo Park
$3,188,000
2062 Mills Ave, Menlo Park
$7,488,000
30 Catalpa Dr, Atherton
$1,359,000
152 Escobar Ave, Los Gatos
$1,210,000
1855 Palm View Pl Apt 124, Santa Clara
$1,440,000
1071 Konstanz Ter, Sunnyvale
$2,150,000
439 Kent Dr, Mountain View
$1,799,000
425-427 Wessex Way, Belmont
$2,298,000
25 Stowe Ln, Menlo Park
$749,000
1949 Messina Dr, San Jose
$1,237,800
719 Hibiscus Pl, San Jose
$1,248,000
77 Shenado Pl, San Jose
$2,680,000
5035 Grimsby Dr, San Jose
$1,250,000
1951 Treewood Ln, San Jose
$2,349,000
2168 Coastland Ave, San Jose
$1,199,000
6564 Boston Post Ct, San Jose
$998,000
4641 Hampton Falls Pl, San Jose
$2,348,000
2812 Thrasher Ln, San Jose
$5,850,000
18803 Hilltop Way, Saratoga
$750,000
2338 Dumbarton Ave, East Palo Alto
$2,398,000
2 Burnham Ct, San Carlos
$1,397,000
1121 Kassel Ter, Sunnyvale
$1,500,000
11A Meadow Ln, Nantucket
$3,300,000
9 Millbrook Rd, Nantucket
$3,595,000
15 Nancy Ann Ln, Nantucket
$3,500,000
12 Myles Standish St, Nantucket
$3,800,000
6 Maple Ln, Nantucket
$2,700,000
17 Cottage Ave, Nantucket
$2,700,000
44 Prospect St Lot A, Nantucket
$4,200,000
3 Monohansett Rd, Nantucket
$4,295,000
10B Angola St, Nantucket
$1,795,000
10A Bayberry Ln, Nantucket
$6,595,000
18 Mill St, Nantucket
$5,295,000
75 Fairgrounds Rd, Nantucket
$1,650,000
1 Arlington St, Nantucket
$9,995,000
6 Fargo Way, Nantucket
$3,725,000
18 Honeysuckle Dr, Nantucket
$2,100,000
54 Union St, Nantucket
$3,995,000
4 Fawn Ln, Nantucket
$6,495,000
12 Willard St, Nantucket
$4,995,000
13 Parson Ln, Nantucket
$2,395,000
2 Forrest Condominium Ave Unit 3, Nantucket
$4,395,000
13 Fawn Ln, Nantucket
$1,650,000
11 Woodland Dr, Nantucket
$7,595,000
45 Starbuck Rd, Nantucket
$5,895,000
4 Saccacha Ave, Nantucket
$4,950,000
47 Fair St, Nantucket
$4,595,000
27 Wigwam Rd, Nantucket
$5,900,000
2 Silver St, Nantucket
$5,995,000
10 York St, Nantucket
$3,995,000
37 Main St, Nantucket
$7,750,000
156 Madaket Rd, Nantucket
$3,795,000
11 Mississippi Ave, Nantucket
$7,695,000
85 Orange St, Nantucket
$3,295,000
321 Madaket Rd, Nantucket
$2,200,000
43 Appleton Rd Unit 2, Nantucket
$7,990,000
6 Sandwich Rd, Nantucket
$3,775,000
4 Flintlock Rd, Nantucket
$3,800,000
35 W Chester St, Nantucket
$5,995,000
191 Polpis Rd, Nantucket
$3,495,000
33 Bartlett Rd, Nantucket
$4,950,000
318 Milestone Rd, Nantucket
$4,150,000
119 Surfside Rd, Nantucket
$4,850,000
8 Sconset Ave, Siasconset
$5,499,000
6 Mariners Way, Nantucket
$5,449,000
2 Mariners Way, Nantucket
$3,050,000
4 Goldenrod Ct, Nantucket
$2,695,000
14 Essex Rd, Nantucket
$2,695,000
14 Flintlock Rd, Nantucket
$6,950,000
5 Brier Patch Rd, Nantucket
$7,595,000
263 Polpis Rd, Nantucket
$3,650,000
47 Morey Ln, Nantucket
$5,995,000
33.5 Vesper Ln, Nantucket
$3,995,000
95 Hummock Pond Rd, Nantucket
$4,390,000
78 Baxter Rd, Nantucket
$2,895,000
18 Pine Tree Rd, Nantucket
$2,500,000
5 Miacomet Ave, Nantucket
$2,495,000
106 Old South Rd Unit B, Nantucket
$5,295,000
4 Sunset Hill Ln, Nantucket
$3,495,000
3 Whitetail Cir, Nantucket
$5,995,000
54 and 56 Meadow View Dr, Nantucket
$1,599,000
14 and 16 Sheep Pond Rd, Nantucket
$1,395,000
2A Forest Ave Unit 1, Nantucket
$4,995,000
44 Madequecham Valley Rd, Nantucket
$9,250,000
109 Orange St, Nantucket
$7,500,000
5 Old Quidnet Milk Rte, Nantucket
$9,995,000
15 N Water St, Nantucket
$2,350,000
3 Newtown Rd, Nantucket
$2,750,000
5 Toombs Ct, Nantucket
$3,990,000
9 Priscilla Ln, Nantucket
$4,250,000
11 Columbus Ave, Nantucket
$8,950,000
4 Gay St, Nantucket
$6,200,000
7 Gray Ave, Nantucket
$7,495,000
8 Sheep Pond Rd, Nantucket
$7,250,000
268 Polpis Rd, Nantucket
$3,225,000
5 Goldenrod Ct, Nantucket
$2,995,000
48 Madequecham Valley Rd, Nantucket
$9,500,000
144 Madaket Rd, Nantucket
$1,350,000
26 Easy St Unit 2, Nantucket
$7,395,000
1 Chadwick Ct, Nantucket
$8,495,000
247 Polpis Rd, Nantucket
$6,450,000
3 Dolphin Ct, Nantucket
$6,595,000
32 Union St, Nantucket
$3,800,000
2 Fawn Ln, Nantucket
$2,200,000
1 H St, Nantucket
$4,295,000
22 Tashama Ln, Nantucket
$5,999,999
26 Tennessee Ave, Nantucket
$3,750,000
27 Longwood Dr, Nantucket
$2,650,000
7 Clifton St, Nantucket
$2,575,000
12 Appleton Rd, Nantucket
$5,950,000
86 Cliff Rd, Nantucket
$3,275,000
32 Old Tom Nevers Rd, Nantucket
$1,150,000
26 Easy St Unit 1, Nantucket
$3,295,000
3 and 8 Maine Ave, Nantucket
$2,750,000
21 Vesper Ln, Nantucket
$5,595,000
46 Baxter Rd, Nantucket
$5,995,000
30 Wanoma Way, Nantucket
$6,995,000
10 Silver St, Nantucket
$2,675,000
20 Kittiwake Ln, Nantucket
$2,750,000
42 Vestal St, Nantucket
$4,395,000
1 E Lincoln Ave, Nantucket
$3,225,000
17 Gay St, Nantucket
$9,725,000
6 Gull Island Ln, Nantucket
$2,499,900
2 Goldenrod Ct, Nantucket
$4,150,000
9 Carew Ln, Nantucket
$3,495,000
3 Cottage Ct, Nantucket
$4,295,000
42B N Union St, Nantucket
$7,995,000
10 E Lincoln Ave, Nantucket
$6,995,000
10 Waquoit Rd, Nantucket
$1,825,000
15 Point Judith Ln, Nantucket
$9,450,000
4 White Elephant Way, Nantucket
$4,295,000
37 Union St, Nantucket
$5,695,000
8 Gingy Ln, Nantucket
$7,995,000
43 Vestal St, Nantucket
$5,195,000
39A Milk St, Nantucket
$2,395,000
38 Hooper Farm Rd, Nantucket
$4,295,000
21 Equator Dr, Nantucket
$1,950,000
20B Miacomet Ave Unit B, Nantucket
$8,995,000
1 Reeds Way, Nantucket
$5,995,000
85 Somerset Rd, Nantucket
$3,250,000
7 Oak Hollow Ln, Nantucket
$3,450,000
76 Sankaty Rd, Nantucket
$2,850,000
2 Sconset Ave, Nantucket
$8,495,000
42 Chuck Hollow Rd, Nantucket
$3,595,000
24 Washaman Ave, Nantucket
$8,250,000
19 India St, Nantucket
$7,995,000
34 Bosworth Rd, Nantucket
$2,695,000
10 Center St, Nantucket
$2,995,000
45 Sheep Pond Rd, Nantucket
$2,395,000
14 Goldfinch Dr, Nantucket
$4,295,000
19 Wanoma Way, Nantucket
$6,995,000
14 Field Ave, Nantucket
$1,095,000
1E Freedom Sq Unit 25, Nantucket
$2,295,000
3 Pakanoket Ln, Nantucket
$2,195,000
21 Kittiwake Ln, Nantucket
$1,875,000
334 Madaket Rd, Nantucket
$2,395,000
22 Sheep Pond Rd, Nantucket
$2,750,000
49 Tom Nevers Rd, Nantucket
$2,250,000
15 Goldfinch Dr, Nantucket
$4,500,000
22 King St, Nantucket
$4,495,000
3 W Sankaty Rd, Nantucket
$6,250,000
1 Little Neck Way, Nantucket
$3,695,000
8 E Dover St, Nantucket
$1,695,000
49A W Chester St, Nantucket
$3,100,000
79 Baxter Rd, Nantucket
$665,000
1856 Tradan Dr, San Jose
$1,299,000
6032 Salida Del Sol, San Jose
$1,175,000
1285 Vine St, San Jose
$1,249,000
657 Woodland Ter, San Jose
$1,745,000
2838 Agua Vista Dr, San Jose
$1,698,000
25 Ludina Way, Redwood City
$1,800,000
1192 Hyde Ave, San Jose
$3,349,000
1374 Prevost St, San Jose
$1,199,000
914 Delmas Ave, San Jose
$750,000
5504 Don Marcello Ct, San Jose
$500,000
Tradewinds Dr Unit 9, San Jose
$1,219,000
221 Beegum Way, San Jose
$1,799,000
6805 Bluffwood Ct, San Jose
$3,480,000
19959 Sea Gull Way, Saratoga
$2,499,000
2831 Monroe St, Santa Clara
$3,265,000
22540 Stevens Creek Blvd, Cupertino
$549,888
2527 Easton Ln Apt 7, San Jose
$2,100,888
2255 Elkhorn Ct, San Jose
$2,600,000
5054 Howes Ln, San Jose
$1,349,000
57 S 17th St, San Jose
$2,695,000
401 Elm St, San Carlos
$1,888,888
Manderston Dr, San Jose
$3,478,000
3813 Mountcliffe Ct, San Jose
$1,395,000
2400 Plateau Dr, San Jose
$1,699,950
2475 Briarwood Dr, San Jose
$1,848,000
2423 Booksin Ave, San Jose
$2,399,000
2448 Moraine Dr, Santa Clara
$1,890,000
1247 Benton St, Santa Clara
$6,890,000
840 Los Altos Ave, Los Altos
$3,650,000
49 W Summit Dr, Redwood City
$898,000
354 Irving Ave, San Jose
$998,000
555 Lanfair Cir, San Jose
$1,299,500
1896 Brixton Ct, San Jose
$1,499,000
1382 N Capitol Ave, San Jose
$2,239,888
, San Jose
$1,798,000
4303 Borina Dr, San Jose
$1,499,000
488 Madison Ct, San Jose
$2,398,888
101 King St, Redwood City
$4,795,000
1021 Cortez Ave, Burlingame
$949,000
793 Sweetwater Way, San Jose
$1,250,000
964 Princess Anne Dr, San Jose
$675,000
3454 Wine Cask Way, San Jose
$835,000
800 N 8th St Unit 106, San Jose
$2,999,888
14111 Alta Vista Ave, Saratoga
$766,000
1883 Agnew Rd Unit 424, Santa Clara
$2,758,888
315 Landeros Dr, Santa Clara
$2,985,000
7593 Normandy Way, Cupertino
$2,688,000
1083 Heatherstone Ave, Sunnyvale
$2,998,000
1645 Blackhawk Dr, Sunnyvale
$3,290,000
997 Ilima Way, Palo Alto
$2,495,000
1703 Lexington Ave, San Mateo
$1,700,000
2846 Agua Vista Dr, San Jose
$2,100,000
16375 W LA Chiquita Ave, Los Gatos
$1,699,000
2246 Benton St, Santa Clara
$3,798,000
887 Loma Verde Ave, Palo Alto
$1,850,000
1385 Stanwood Dr, San Jose
$1,900,888
1518 Darryl Dr, San Jose
$3,495,000
1394 Hillcrest Dr, San Jose
$1,899,000
2293 Middletown Dr, Campbell
$2,300,000
930 Clyde Ave, Santa Clara
$2,100,000
920 Clyde Ave, Santa Clara
$2,998,000
10534 Sterling Blvd, Cupertino
$3,350,000
2110 Williams St, Palo Alto
$1,650,000
1369 Stanwood Dr, San Jose
$2,695,000
Pope St, Menlo Park
$9,988,000
14 Flood Cir, Atherton
$2,300,000
2460 Poppy Dr, Burlingame
$1,199,000
4838 Snell Ave, San Jose
$1,060,000
1815 Woodland Ave, East Palo Alto
$1,175,000
42 Union St, San Jose
$1,895,000
2089 Orestes Way, Campbell
$2,495,000
444 Villa Ter, San Mateo
$800,000
1 Laurel St Apt 102, San Carlos
$1,499,000
1119-1121 Topaz Ave, San Jose
$760,000
3162 Landess Ave Apt D, San Jose
$550,000
1263 Bouret Dr Unit 2, San Jose
$2,199,000
3445 Kenyon Dr, Santa Clara
$1,449,568
429 Birkhaven Pl, San Jose
$1,429,000
4119 Heppner Ln, San Jose
$1,898,000
1611 Shreen Ct, San Jose
$4,268,000
737 Ensign Way, Palo Alto
$2,750,000
570 Kenwood Dr, Menlo Park
$635,000
5009 Grey Feather Cir, San Jose
$1,488,888
2984 Via Del Sol, San Jose
$599,999
1221 Yarwood Ct, San Jose
$968,000
111 Cahill Park Dr, San Jose
$1,399,000
1584 Sabina Way, San Jose
$1,595,000
1543 Arbutus Dr, San Jose
$1,998,000
1542 Jacob Ave, San Jose
$1,925,000
3385 Valley Square Ln, San Jose
$2,998,000
402 Bella Vista Ave, Los Gatos
$1,099,000
102 Dot Ave, Campbell
$1,980,000
164 N 3rd St, Campbell
$2,798,000
674 W Sunnyoaks Ave, Campbell
$2,488,000
2242 Pyle Ct, Santa Clara
$1,100,000
19850 Portal Plz, Cupertino
$1,800,000
421 Burgoyne St, Mountain View
$2,950,000
643 Vista Dr, Redwood City
$3,450,000
22 Susan Gale Ct, Menlo Park
$3,125,000
3723 Alameda De Las Pulgas, Menlo Park
$1,350,000
1311 Windermere Ave, Menlo Park
$2,199,000
313 W 25th Ave, San Mateo
$1,749,000
1221 Castlemont Ave, San Jose
$1,849,950
6385 Tamalpais Ave, San Jose
$1,599,999
21474 Almaden Rd, San Jose
$1,270,000
419 Terrace Dr, San Jose
$2,298,000
16281 Camino Del Sol, Los Gatos
$2,750,000
20580 Canyon View Dr, Saratoga
$1,990,000
816 Christopher Ct, Santa Clara
$3,598,800
10730 LA Roda Dr, Cupertino
$2,580,000
18825 Pendergast Ave, Cupertino
$2,895,000
401 Grand St, Redwood City
$1,488,000
333 Madrone St, Redwood City
$1,980,000
212 Briar Ln, San Mateo
$1,899,000
114 E Hillsdale Blvd, San Mateo
$1,798,000
3031 Flores St, San Mateo
$3,898,000
405 Glendale Rd, San Mateo
$1,879,000
1392 Thornbury Ln, San Jose
$1,999,888
1769 Springsong Dr, San Jose
$1,638,888
1668 Cassiar Dr, San Jose
$2,399,000
240 Richfield Dr, San Jose
$499,000
2250 Monroe St Apt 131, Santa Clara
$1,998,000
20860 Garden Gate Dr, Cupertino
$6,490,000
26201 Dori Ln, Los Altos Hills
$3,600,000
265 Waverley St, Menlo Park
$1,999,000
537 7th Ave, Menlo Park
$1,599,888
1743 Maxine Ave, San Mateo
$948,800
803 Beaver Creek Way, San Jose
$1,799,000
2351 Radio Ave, San Jose
$1,995,000
Malone Rd, San Jose
$1,788,000
649 Brenda Lee Dr, San Jose
$1,199,999
1023 Kiser Dr, San Jose
$1,687,500
5563 Vassar Dr, San Jose
$1,628,000
3388 Picadilly Dr, San Jose
$1,598,000
1496 Portobelo Dr, San Jose
$1,888,000
3294 Lindenoaks Dr, San Jose
$1,390,000
112 Abby Wood Ct, Los Gatos
$2,300,000
1671 Elwood Dr, Los Gatos
$1,300,000
19908 Vineyard Ln, Saratoga
$1,998,000
28 N Peter Dr, Campbell
$5,995,000
140 S Peter Dr, Campbell
$2,650,000
1615 Edgewood Rd, Redwood City
$1,289,900
315 Waters Park Cir Unit 10, San Mateo
$920,000
800 N El Camino Real Unit 102, San Mateo
$2,799,000
2229 Howard Ave, San Carlos
$618,000
5005 Grey Feather Cir, San Jose
$999,000
3287 Montevarchi St, San Jose
$1,458,000
4584 Thousand Oaks Dr, San Jose
$1,798,000
3742 Wellington Sq, San Jose
$525,000
748 Northrup St Apt 332, San Jose
$3,198,000
2286 Markham Ave, San Jose
$1,950,000
1327 Cherry Ave, San Jose
$2,250,000
1274 Norval Way, San Jose
$1,998,000
1005 California Ave, San Jose
$3,598,888
1857 Cabana Dr, San Jose
$1,898,888
1315 Glen Eyrie Ave, San Jose
$1,900,000
4878 Elester Dr, San Jose
$1,798,000
4875 Pepperwood Way, San Jose
$1,599,999
1824 Rosswood Dr, San Jose
$1,298,888
3146 Irlanda Way, San Jose
$1,688,000
6304 Mountford Dr, San Jose
$1,249,000
6013 Black Onyx Ct, San Jose
$949,000
330 Oleander Dr, San Jose
$1,299,888
161 Herlong Ave, San Jose
$1,388,000
553 Shawnee Ln, San Jose
$3,491,089
20550 Buena Monte Dr, San Jose
$1,988,800
6194 Calle Esperanza, San Jose
$1,589,000
1289 Kimberly Dr, San Jose
$1,625,000
1179 Mesa Dr, San Jose
$2,598,000
3281 Valley Square Ln, San Jose
$3,998,000
19798 Colby Ct, Saratoga
$1,499,900
44 Redding Rd, Campbell
$1,695,000
1341 Parsons Ave, Campbell
$749,000
1400 Bowe Ave Apt 1401, Santa Clara
$660,000
120 Saratoga Ave Apt 84, Santa Clara
$1,988,888
3111 Humbolt Ave, Santa Clara
$1,775,000
10093 Senate Way, Cupertino
$1,990,000
6566 Clifford Dr, Cupertino
$1,249,000
828 San Saba Ct, Sunnyvale
$1,489,000
227 Ada Ave Apt M, Mountain View
$950,000
1963 Rock St Apt 27, Mountain View
$1,999,000
312 Walker Dr, Mountain View
$3,100,000
806 Emily Dr, Mountain View
$1,299,000
186 Fair Oaks St, Mountain View
$5,200,000
540 Shelby Ln, Los Altos
$3,600,000
1710 Penny Way, Los Altos
$4,950,000
1564 Wessex Ave, Los Altos
$5,298,000
10955 Stonebrook Dr, Los Altos
$6,398,000
12882 Viscaino Rd, Los Altos Hills
$2,100,000
4175 Coulombe Dr, Palo Alto
$3,688,000
3920 Park Blvd, Palo Alto
$1,999,000
3181 Maddux Dr, Palo Alto
$9,200,000
1408 Edgewood Dr, Palo Alto
$1,215,000
400 El Camino Real Unit 217, Belmont
$2,090,000
19 Edgewood Pl, Belmont
$1,895,000
1348 Paloma Ave, Belmont
$2,280,000
2433 Hastings Dr, Belmont
$1,988,000
1917 Hillman Ave, Belmont
$2,198,000
170 Grand St, Redwood City
$3,695,000
95 Belle Roche Ave, Redwood City
$1,198,000
Horgan Ave Unit 12, Redwood City
$1,798,900
1846-1848 Woodside Rd, Redwood City
$1,395,000
1027 Valota Rd, Redwood City
$1,330,000
1147 King St, Redwood City
$1,429,500
2315 Sharon Rd, Menlo Park
$1,698,888
1148 Berkeley Ave, Menlo Park
$1,398,000
605 E 39th Ave, San Mateo
$1,999,950
1751 Celeste Dr, San Mateo
$1,795,000
1223 Quince St, San Mateo
$2,600,000
109 Hobart Ave, San Mateo
$649,000
401 S Norfolk St Apt 301, San Mateo
$2,988,000
1524 Arc Way, Burlingame
$2,188,800
2639 Brady Ct, Santa Clara
$6,988,000
28100 Story Hill Ln, Los Altos Hills
$2,998,800
320 Waverly St, Sunnyvale
$4,298,000
1520 Awalt Ct, Los Altos
$1,999,888
1128 Summerwings Ct, San Jose
$1,800,000
3015 Cameron Way, Santa Clara
$1,800,000
101 Alma St Apt 301, Palo Alto
$3,498,888
1056 Oaktree Dr, San Jose
$1,599,000
3009 Rubino Cir, San Jose
$2,299,000
1233 Malone Rd, San Jose
$2,195,000
1072 Laurie Ave, San Jose
$1,848,000
2393 Stratford Dr, San Jose
$1,349,000
6055 Emlyn Ct, San Jose
$1,650,000
5933 Dunn Ave, San Jose
$1,250,000
276 Bieber Dr, San Jose
$1,849,888
6052 Ashburton Dr, San Jose
$2,000,000
6332 McAbee Rd, San Jose
$1,950,000
1342 Essex Way, San Jose
$1,298,000
645 Woodland Ter, San Jose
$1,998,000
2179 Fordham Dr, Santa Clara
$1,949,999
2171 Monterey Ave, Santa Clara
$2,700,000
153 Arcadia Ave, Santa Clara
$588,000
2201 Monroe St Apt 1004, Santa Clara
$1,380,000
820 E Duane Ave Unit 5, Sunnyvale
$1,999,000
874 San Simeon Dr, Mountain View
$1,800,000
1223 Saint Francis St, Redwood City
$7,595,000
15 Montana Ln, Menlo Park
$550,000
1531 Marina Ct Unit B, San Mateo
$2,199,888
1559 Hammett Ct, San Jose
$3,399,000
1022 Clintonia Ave, San Jose
$1,599,888
1586 Koch Ln, San Jose
$2,398,888
1785 Lincoln Ave, San Jose
$1,380,525
5950 Jacques Dr, San Jose
$1,399,000
5887 Tandera Ave, San Jose
$499,000
4608 Capay Dr Unit 3, San Jose
$1,049,000
202 San Pedro Cir, San Jose
$4,379,045
14111 Shadow Oaks Way, Saratoga
$1,948,000
1331 Patio Dr, Campbell
$2,080,000
4126 Tobin Cir, Santa Clara
$1,749,000
1736 Noranda Dr, Sunnyvale
$1,980,000
180 Espinosa Ln, Mountain View
$2,199,000
1364 Randol Ave, San Jose
$1,300,000
928 N 7th St, San Jose
$2,698,000
2489 Edith Ave, Redwood City
$1,149,000
5737 Indian Ave, San Jose
$2,997,000
97 Belleau Ave, Atherton
$1,790,000
1045 Redmond Ave, San Jose
$3,998,000
21030 Canyon View Dr, Saratoga
$1,998,000
21685 Olive Ave, Cupertino
$3,688,000
10675 Club House Ln, Cupertino
$5,150,000
415 Santa Monica Ave, Menlo Park
$6,490,000
1516 Los Montes Dr, Burlingame
$1,095,000
101 2nd St Apt 5, Los Altos
$2,500,000
711 Highland Ave, San Mateo
$7,950,800
28 San Benito Ave, Atherton
$1,995,000
1256 Thornbury Ln, San Jose
$1,695,000
234 Beresford Ave, Redwood City
$1,849,000
2779 Parasol Ct, San Jose
$1,585,000
1268 Bryan Ave, San Jose
$1,498,000
16345 Los Gatos Blvd Unit 6, Los Gatos
$9,850,000
15863 Mina Way, Saratoga
$3,490,000
445 Arlington Rd, Redwood City
$9,700,000
854 Cambridge Ave, Menlo Park
$3,898,000
440 Central Ave, Menlo Park
$1,499,000
817 Rand St, San Mateo
$7,488,000
306 Walsh Rd, Atherton
$950,000
428 Whistler Pl, San Jose
$900,000
263 Wisteria Dr, East Palo Alto
$599,000
5696 Makati Cir Apt D, San Jose
$1,350,000
2149 Junction Ave Apt 10, Mountain View
$2,300,000
248 Fairmont Ave, San Carlos
$3,500,000
16490 Wood Acres Rd, Los Gatos
$2,398,888
5016 Las Cruces Ct, San Jose
$4,995,000
52 Hernandez Ave, Los Gatos
$3,448,888
19997 Twilight Ct, Cupertino
$786,000
1033 Crestview Dr Apt 110, Mountain View
$4,800,000
554 Edgewood Rd, San Mateo
$2,788,000
2801 Trousdale Dr, Burlingame
$1,483,000
4974 Avery Ct, San Jose
$1,498,000
5118 Sussex Park Ct, San Jose
$998,000
4042 Rio Ct, San Jose
$638,000
1052 Delna Manor Ln Unit 1052, San Jose
$1,730,000
2433 W Hedding St, San Jose
$880,000
1337 Fruitdale Ave, San Jose
The screener ranks what is already listed. The same underbuilt signals also power the target lists behind unlisted deals: our guide to finding off-market teardown opportunities on the SF Peninsula covers owner outreach, probate and pre-foreclosure records, and the listing-lifecycle triggers that surface these lots before they reach the MLS.
Underbuilt-Lot Screener FAQ
What is an "underbuilt" lot?
A lot is underbuilt when the existing house uses only a small share of the floor area the zoning would allow — for example, a 1,200 sqft mid-century home on a lot where the city permits 3,500+ sqft. The unused building envelope is the opportunity: add square footage, or scrape and rebuild larger.
How is the redevelopment score calculated?
We estimate the maximum single-family gross floor area allowed on each lot using the city's own zoning rule (its floor-area-ratio formula or coverage/height limits), then compare it to the existing living area to get a utilization percentage and the buildable headroom in square feet. The 0-100 score weights how far below the envelope the home is, its age, and lot size. It is a screening estimate — verify FAR, setbacks, and height with the local planning department.
What is the difference between "expansion room" and a "teardown candidate"?
Expansion room means there is meaningful unused floor area to add on. A teardown candidate is flagged only when a home is both using a low share of its envelope AND is older (pre-1978) on a sizable lot — the profile where a scrape-and-rebuild typically pencils out. Requiring both age and low utilization keeps newer small homes from being mislabeled.
Where do the floor-area limits come from?
Each city sets its own single-family FAR or floor-area limit in its zoning code. We curate the actual rule per city — including sliding-scale formulas (Palo Alto, Mountain View, Menlo Park, Los Altos, Saratoga, Los Gatos) — with a municipal-code citation and an as-of date. Cities we have not individually curated, or that set no explicit FAR, use a clearly-flagged conservative estimate.
Does this pair with SB 9 and ADU analysis?
Yes. An underbuilt lot that is also SB 9-eligible or strong for an ADU is a compounding opportunity — you can expand the primary home, split the lot, or add units. The property detail page shows all three signals side by side.
Which markets does the screener cover?
Active listings across San Mateo County and Santa Clara County, scored against each jurisdiction's floor-area rules so you can focus on the most underbuilt Silicon Valley lots.
Related guides
Keep going with more AddressIntel research on this market.
Peninsula Infill Development: How to Find Underutilized Parcels in 2026
Sourcing underutilized Peninsula parcels with lot-coverage, land-value, and permit signals.
Menlo Park Redevelopment Opportunities: A 2026 Developer Guide
Where redevelopment concentrates in Menlo Park and the entitlement realities around it.
Condo Investment Screener
Condos and townhomes ranked by below-market value and building-level signals.