Opinion by
Mr. Justice Roberts,Appellee Kit-Mar Builders, Inc., entered into an agreement to purchase a 140-acre tract of land in Con*469cord Township, Delaware County. The agreement was contingent on the tract being rezoned to permit the construction of single-family homes on lots of one acre, since the tract was then zoned to require lots of no less than two acres along the existing roads and no less than three acres in the interior. Appellee’s request for rezoning and application for a building permit were denied; it then appealed to the zoning board of adjustment and announced that it would not seek to prove the hardship necessary to secure a variance but would instead attack the constitutionality of the zoning ordinance as applied to the property in question. The zoning board upheld the minimum lot requirements and appellee took its case to the court of common pleas. That court took no additional testimony but made new findings of fact and reversed the board. Concord Township then filed a petition for allowance of an appeal to this Court which we granted.
Initially we must note that the trial court erred in making new findings of fact without taking additional testimony. Without an independent taking of evidence the trial court could not properly make its own findings of fact, but could only review the decision of the board to determine if an abuse of discretion or an error of law had been committed. See, e.g., National Land and Investment Company v. Easttown Township Board of Adjustment, 419 Pa. 504, 215 A. 2d 597 (1965); Cleaver v. Board of Adjustment, 414 Pa. 367, 200 A. 2d 408 (1964) ; Tidewater Oil Company v. Poore, 395 Pa. 89, 149 A. 2d 636 (1959). However, it remains within the province of this Court to affirm the action of the trial court, even if that action was based on an erroneous procedure, if there are independent grounds for affirmance. See Sherwood v. Elgart, 383 Pa. 110, 117 A. 2d 899 (1955). We conclude that, even accepting the findings of the zoning board, the ordinance here in question is unconstitutional under the test set forth *470in onr decision in National Land Investment Company v. Easttown Township Board of Adjustment, 419 Pa. 504, 215 A. 2d 597 (1965).
We decided in National Land that a scheme of zoning that has an exclusionary purpose or result is not acceptable in Pennsylvania. We do not intend to say, of course, that minimum lot size requirements are inherently unreasonable. Planning considerations and other interests can justify reasonably varying minimum lot sizes in given areas of a community.1 “At some point along the spectrum, however, the size of lots ceases to be a concern requiring public regulation and becomes simply a matter of private preference.” 419 Pa. at 524, 215 A. 2d at 608.2 The two and three acre minimums imposed in this case are no more reasonable than the four acre requirements struck down in Nation*471al Land. As we pointed out in National Land, there are obvious advantages to the residents of a community in having houses built on four—or three—acre lots. However, minimum lot sizes of the magnitude required by this ordinance are a great deal larger than what should be considered as a necessary size for the building of a house,3 and are therefore not the proper subjects of public regulation. As a matter of fact, a house can fit quite comfortably on a one-acre lot without being the least bit cramped.4 Absent some extraordinary justification, a zoning ordinance with minimum lot sizes such as those in this case is completely unreasonable.
As the primary justification for the zoning ordinance now before us the township contends that lots *472■of a smaller size will create a potential sewerage problem.5 It was on this question that the zoning board and the trial court made conflicting findings of fact. Whether a potential sewerage problem exists or not is irrelevant, however, since we explicitly rejected the argument that sewerage problems could excuse exclusionary-zoning in National Land-. “We can not help but note also that the Second Class Township Code provides for establishing sanitary regulations which can be enforced by a ‘sanitary board’ regardless of the zoning for the area. The Code also provides for the installation and maintenance of sewer systems but the township has made no plans in this regard. In addition, under the township subdivision regulations, the zoning officer may require lots larger than the minimum permitted by the zoning ordinance if the result of percolation tests upon the land show that a larger land area is needed for proper drainage and disposal of sewage. These legislatively sanctioned methods for dealing with *473the sewage problem compel the conclusion that a four acre minimum is neither a necessary nor reasonable method by which Easttown can protect itself from the menace of pollution.” 419 Pa. at 526, 215 A. 2d at 609.
Everything said in the quoted paragraph is equally applicable to the case now before us. We in effect held in National Land that because there were alternative methods for dealing with nearly all the problems that attend a growth in population, including sewage problems, zoning which had an exclusive purpose or effect could not be allowed. See Westwood Forest Estates, Inc. v. Village of South Nyack, 23 N.Y. 2d 424, 428-29, 244 N.E. 2d 700, 702-03 (1969) : “This is not to say that the village may not, pursuant to its other and general police powers [i.e., not zoning power], impose other restrictions or conditions on the granting of a building permit to plaintiff, such as a general assessment for reconstruction of the sewage system, granting of building permits ... in stages, or perhaps even a moratorium on the issuance of any building permits, reasonably limited as to time. But, whatever the right of a municipality to impose ‘ “a * * * temporary restraint of beneficial enjoyment * * * where the interference is necessary to promote the ultimate good of either the municipality as a whole or of the immediate neighborhood” ’, such restraint must be kept ‘ “within the limits of necessity” ’, and may not prevent permanently the reasonable use of private property for the only purposes to which it is practically adapted [citations omitted].”
We recently reaffirmed exactly this position in Delaware County Community College Appeal, 435 Pa. 264, 270, 254 A. 2d 641, 645 (1969), where this Court, citing National Land, explicitly rejected a zoning exclusion as a proper method for dealing with sewerage problems: “The court below pointed out that once the *474special exception is granted, the college will still be required to make ‘appropriate arrangements [for sewerage] . . . consistent with local ordinances and regulations and state statutes pertaining to sewerage disposal. ... If expansion is required, then it should be accomplished.’ We are in accordance with this view; the Board could not properly malee a broad scale zoning decision simply because of a potential sewerage problem in the future.” (Emphasis added.) We once again reaffirm our past authority and refuse to allow the township to do precisely what we have never permitted —keep out people, rather than make community improvements.
The implication of our decision in National Land is that communities must deal with the problems of population growth. They may not refuse to confront the future by adopting zoning regulations that effectively restrict population to near present levels.6 It is not for any given township to say who may or may not live within its confines, while disregarding the interests of the entire area. If Concord Township is successful in unnaturally limiting its population growth through the use of exclusive zoning regulations, the people who *475would normally live there will inevitably have to live in another community, and the requirement that they do so is not a decision that Concord Township should alone be able to make.
While our decision in National Land requires municipalities to meet the challenge of population growth without closing their doors to it, we have indicated our willingness to give communities the ability to respond with great flexibility to the problems caused by suburban expansion. Most notable in this regard is our decision in Village 2 at New Hope, Inc. Appeals, 429 Pa. 626, 241 A. 2d 81 (1868), in which we approved planned unit development. “It would seem that this decision is a forerunner of a necessary change in the law of planned development. Caught between increasing population pressure and urban sprawl and the reluctance of the rural communities to absorb their fair share of the load, planners have been faced with an unpleasant choice. They are now equipped with a proper instrument to meet the challenge. The scope of this decision is by no means limited to residential and ancillary usage. It can just as effectively be applied to commercial and industrial development as well as to new combinations of land use which are only limited by the ingenuity of the planner and developer. Effective interrelations between the various component needs of the community can now be more easily realized. For instance, various types of housing, schools, and recreational facilities can be planned not only for the immediate needs of the community, but also to effectuate broad social purposes. The adverse economic impact of large-scale development can be mitigated if not entirely eliminated by the judicious juxtapositioning of revenue-producing development with residential and public uses. In this manner, achievement of good traffic separation, public transportation, visual enjoyment, and a host of other desiderata can be realized as [sic] *476much reduced economic cost.” Zucker and Wolffe, Supreme Court Legalizes PUD: New Hope from New Hope, 2 Land Use Controls 32, 33-34 (1968).
We will not turn our back on the approach to these problems which we adopted in National Land and Village 2 at New Hope. New and exciting techniques are available to the local governing bodies of this Commonwealth for dealing with the problems of population growth. Neither Concord Township nor Easttown Township nor any other local governing unit may retreat behind a cover of exclusive zoning. We fully realize that the overall solution to these problems lies with greater regional planning, but until the time comes that we have such a system we must confront the situation as it is. The power currently resides in the hands of each local governing unit, and we will not tolerate their abusing that power in attempting to zone out growth at the expense of neighboring communities.
Finally, we cannot ignore the fact that in the narrow confines of the ease before us, Concord Township’s argument that three-acre minimum zoning is necessary for adequate on-site sewerage is patently ridiculous. The township does not argue that on-site sewerage is impossible for the lots in question; instead it maintains that if houses are built on lots of one acre, as envisioned by appellee, not on lots of three acres, on-site sewerage will become unfeasible. This argument assumes that all of the lot where the house is not is necessary for waste effluence, which simply is not what happens. The difference in size between a three-acre lot and a one-acre lot is irrelevant to the problem of sewage disposal, absent the construction of a house of an unimaginably enormous magnitude.
This proposition is fully borne out by the Pennsylvania Department of Health Regulations for the Administration of the Pennsylvania Sewage Facilities Act, *477Act of January 24, 1966, P. L. (1965) 1535, 35 P.S. §750.1 et seq., Regulation Chapter 4, Article 423, Standards for Individual Sewage Disposal Systems §7.1-1. This regulation tells us that if the soil percolation rate on a given lot exceeds 60 minutes per inch no on-site sewage disposal will be permitted. Let us assume that the lots in question have the bare minimum percolation rates necessary to support on-site sewerage. Section 7.3 indicates that on a lot with the minimum acceptable percolation rate the required absorption area is only 330 square feet per bedroom. See §7.3, Table IV.7 Adding in the maximum isolation distances provided for in §2, Tables I and II,8 the required ab*478sorption area for a three bedroom house on a lot with the minimum acceptable percolation rate would be only a little more than 1,000 square feet. We can conclude from these Department of Health regulations that a three bedroom house cannot be built with on-site sewerage if such disposal system would require more than approximately a 1,000 square foot absorption area. One acre contains 43,560 square feet and three acres contain 130,680 square feet. It is obviously sheer fantasy for the township to claim that, because of an on-site sewerage problem, houses cannot be built on a one-acre lot, but can be built on a three-acre lot.
Thinly veiled justifications for exclusionary zoning will not be countenanced by this Court. We rejected them in National Land and in our very recent decision in Delaware County Community College Appeal, supra, and we reject them here.
Decree affirmed.
The fundamental proposition in eases involving-' property-rights is that an individual generally should be able to utilize his own land as he sees fit. U.S. Const. Amends. V, XIV. Although zoning is, in general, a proper exercise of police power which can permissibly limit an individual’s property rights, Village of Euclid v. Ambler Realty Co., 272 U.S. 365, 47 S. Ct. 114 (1926), it goes without saying that this restriction on the individual’s right to use his own property cannot be unreasonable. E.g., Eller v. Board of Adjustment, 414 Pa. 1, 198 A. 2d 863 (1964).
Cf. Sager, Tight Little Islands: Exclusionary Zoning, Equal Protection, and the Indigent, 21 Stan. L. Rev. 767, 791 (1969) : “The policy issue thus becomes one of the quantum of acknowledged social injustice involved in a formal governmental unit excluding or segregating people on the basis of their means. If the question is one of the constitutionality of individuals acting in a fashion that excludes the poor from neighborhoods—through covenants of home value or size of land and structure or whatever—the balance struck may be different because of the values assigned to the individual’s freedom to dispose of property. It would seem that the serious harm done to accepted egalitarian ends would at least preclude direct governmental promulgation of exclusionary land devices, unless those devices find their justification in the effectuation of governmental ends of overriding importance.” Compare Shelley v. Kraemer, 334 U.S. 1, 68 S. Ct. 836 (1948).
A three-acre lot, for instance, is an enormous tract on which to build a single house. This is best illustrated by pointing to some familiar landmarks and areas that encompass approximately three acres. For example, in the City of Pittsburgh, the area bounded by Smithfiold Street and William Penn Place and Cherry Way, stretching from Forbes Avenue through Fifth Avenue and Oliver Avenue to approximately the half-way point in Mellon Square is about three acres in size. In Harrisburg, the Highway and Safety Building and its adjoining plaza is built on a lot of approximately three acres. In Philadelphia, the Lit Brothers Store lot, which takes up an entire square block bounded by 8th Street, Market Street, 7th Street, and Filbert Street, is only slightly more than three acres in size; the Wanamaker’s store occupies somewhat less than three acres; and Rittenhouse Square, divided down the middle, would create two lots of about three acres each.
These figures are supported by letters from: Harrisburg—Ronald S. Pontius, Space and Facilities Planning Unit, Pennsylvania Department of Property and Supplies; Pittsburgh—Samuel Marsh, Pittsburgh Department of Public Works; Philadelphia—Paul F. Croley, Executive Vice President, Philadelphia Industrial Development Corporation. These letters are on file with the Prothonotary’s office.
The Kaufmann’s Department Store in Pittsburgh is built on approximately a one-acre lot, and clearly a house built on the same area would hardly want for elbow room. See note 2, supra.
Appellant also .offers some other arguments which are so clearly makeweights as to barely require comment. For example, appellant notes that there is but one bus in the township. The rationale of National Land hardly allows a municipality to continue indefinitely an exclusionary zoning scheme because it refuses to purchase and operate a second bus. Likewise, it is claimed that the current road network is suitable only for the present population, which hardly explains why new roads should not be built to accommodate new people. As we said in dealing with the same argument in National Land, zoning may not be used “to avoid the increased responsibilities and economic burdens which time and natural growth invariably bring.” 419 Pa. at 528, 215 A. 2d at 610. See Delaware County Community College Appeal, 435 Pa. 264, 254 A. 2d 641 (1969) ; Lower Merion Twp. v. Enokay, Inc., 427 Pa. 128, 233 A. 2d 883 (1967) ; Archbishop O’Hara’s Appeal, 389 Pa. 35, 131 A. 2d 587 (1957). Finally, almost unbelievably, appellant maintains that two and three acre zoning would be more in conformity with the rural and historical surroundings of the neighborhood. These are exactly the kinds of aesthetic considerations which we explicitly rejected in National Land.
“The question posed is whether the township can stand in the way of the natural forces which send our growing population into hitherto undeveloped areas in search of a comfortable place to live. We have concluded not. A zoning ordinance whose primary purpose is to prevent the entrance of newcomers in order to avoid future burdens, economic and otherwise, upon the administration of public services and facilities can not be held valid.” 419 Pa. at 532, 215 A. 2d at 612.
Although National Land, and this problem in general, is postured as involving the constitutional due process rights of the landowner whose property has been zoned adversely to his best interests, it cannot realistically be detached from the rights of other people desirous of moving into the area “in search of a comfortable place to live.” See generally Sager, Tight Little Islands: Exclusionary Zoning, Equal Protection, and the Indigent, 21 Stan. L. Rev. 767 (1969).
“7.3 Absorption Area Requirements for Private Residential (Provides for Garbage Grinder and Automatic-Sequence Washing Machines)
TABRE IV
Septic Tank Effluent Aerobic Tank Effluent Required Absorption Required Absorption
Percolation Rate (time for water to fall 1 in. in min.) Area Sq. ft./bedroom Area (Standard trenches, seepage beds, seepage pits)
15 or less 175 *120
16 - 30 250 *210
31 - 45 300 300
46 - 60 330 330
Indicates reduced absorption area other than required for conventional septic tank effluent. Aerobic sewage treatment systems utilizing reduced absorption areas for effluent disposal are experimental and shall be so indicated on the permit.”
“2. Isolation Distances
The minimum isolation distances shown in Tables I and II shall be maintained between the sewage disposal system and the respective features itemized in the tables. Where conditions warrant, greater isolation distances may be required.
TABRE I
Septic Tank-Minimum Isolation Distances
Property Rine 10 feet
*478Occupied Buildings ..................... 10 feet
Individual Water Supply ............... 50 feet
TABLE II
Leaching System-Minimum Isolation Distances
Individual Water Supply ............... 100 feet
Streams, Lakes or Other Surface Water 50 feet
Occupied Buildings .................... 10 feet
Property Lines . 10 feet’