What Is Zoning Plan Change and Value Increase Share?

A plan change can alter a parcel's type of use (for example from agricultural to residential) or its building conditions (floor area ratio, number of storeys, building height). An increase in building rights raises the value the property can generate, because more construction area can be built on the same plot or a higher-value use becomes possible.

As a hypothetical example: if a parcel used as agricultural land is rezoned as a residential area, its value is no longer determined only by its agricultural yield but by the return on the housing project that can be built on it. A change can sometimes reduce value as well, for instance if building conditions are restricted or part of the parcel is allocated to roads and green space. Although the subject of this article is the increase, a valuation examines both directions impartially.

The market values of the property before and after the plan change are determined separately, according to conditions on the same date. The difference between the two values shows the value increase created by the change. What is critical here is that both values are calculated on the basis of market conditions on the same date; otherwise part of the increase may stem from general market movement rather than from the plan change, and the real cause of the difference becomes muddled.

This work requires specialist expertise and careful comparable analysis. For the pre-change situation, parcels with similar use and building conditions are compared; for the post-change situation, parcels or projects that fit the new conditions are compared. Where there are not enough comparables, a project-based valuation approach can also be used for plots with development potential. For the logic of the methods, see our article What Are the Real Estate Valuation Methods?

The report can be used as a basis in documents submitted to the relevant authorities, in allocation calculations among rights holders and in disputes. The authority to which the report will be submitted should be stated at the outset, because some authorities may require certain content, format or organisational qualifications.

Particularly for parcels with more than one owner, the report is a useful guide for seeing the effect of the plan change on each co-owner. In the event of a dispute, the court may appoint its own expert; in that case the private report is treated as a supporting document. You may also be interested in our article Real Estate Valuation in Inheritance and Termination of Co-Ownership.

The title deed record (block and parcel details), zoning status documents from before and after the change, the zoning plan change decision or the relevant letter and, if available, the plan sheet are generally required. Plan notes and the approval date of the plan change are also important, because the comparison date is generally determined by this date; the exact rules may vary under the relevant legislation.

The zoning status document obtained from the municipality must be current. Older documents may not reflect the plan conditions in force. If some documents are missing, completing them together with the firm before the valuation begins shortens the process.

If you are paying a price based on an expected plan change when buying land, check whether the change has been approved and has entered into force. A premium paid for an unapproved draft plan can be lost if the plan does not materialise.

Because obligations may arise after a plan change, you need to learn the current legislation and the relevant municipality's practice before buying. Support should be obtained from a specialist for the calculation and legal consequences of these obligations.

If a plan change has not yet been approved or is at the public display stage, the valuation expert decides how to treat it according to the purpose of the report. A valuation based on the plan in force reflects the property's legal status today. If there is an expectation that the plan change will materialise, that expectation can only be taken into account if there is sufficient evidence and market behaviour and if it is clearly stated in the report.

A plan change that is not yet final is an important source of uncertainty in a valuation. An approved plan and a draft on display do not give the same confidence; there is a possibility of objection, cancellation or re-drafting. For this reason it is important to attach official documents showing the stage of the plan to the report.

Changes that affect only part of a parcel also require special attention. For example, a certain part of a parcel may be allocated as a road or park while building rights have increased in the remainder. In this case, a separate assessment for the whole parcel is needed to find the net effect. For parcels with shared ownership, how the change will affect each co-owner's share is calculated separately.

In conclusion, although measuring the value increase looks like a simple subtraction, careful data collection and analysis lie behind it. Determining the dates, plan decisions and comparables correctly determines the reliability of the result.

Determine the scope and approval date of the plan change, document the property's zoning status before and after the change, have two separate valuations done as of the same date, clarify which authority the report will be submitted to, and check the current version of the relevant legislation.

Collecting the documents needed for the study in advance shortens the process: the title deed record, plan sheets from before and after the change, zoning status documents and the plan change decision. The date of the documents matters; a document with the wrong date leads the calculation to rest on the wrong basis.

Calculating the values before and after the plan change as of different dates, failing to examine the change's real effect on the parcel in detail and applying with missing documents are common mistakes. These mistakes can lead to the value difference being calculated incorrectly.

Another mistake is to attribute a general price increase in the area to the plan change. A general market increase can occur independently of the plan change; the expert therefore calculates both values according to market conditions on the same date and tries to separate the part of the increase that stems only from the plan change.

The basic principle of the calculation is to value the same parcel on the same date under two different legal situations: one as if there had been no plan change, the other with the change made. Because market conditions and the date are held constant, the difference between the two values shows only the increase arising from the change in zoning rights.

A hypothetical example: if a parcel of agricultural character is brought into a residential area, the parcel's old value is calculated as agricultural land and its new value under residential building conditions. The difference between the two is an indicator of the value increase created by the change. The numbers are fictional; in a real calculation, the parcel's characteristics, building rights and comparable sales are decisive.

The hardest part of the work is often establishing the retrospective value. Finding comparable sales data that reflect the situation before the plan change is difficult, especially if there are few transactions in the area. In that case the expert states the lack of comparables and the assumptions used clearly in the report. The purpose of this is to let the authority reading the report and the rights holders see the basis of the result.

The rules, rates and payment procedures for the value increase share depend on the legislation and may change over time. The current provisions on the subject should therefore be learned from the relevant authority or a legal adviser; the valuation report provides only the technical determination of the value difference.