Survey and boundaries
Plot size in Germany: how to check the official area before you buy, and what to do when the square metres don't add up
How to check a plot's size in Germany: official cadastre area, land register entry, why listings differ, the BGH on ca. figures, and survey costs.
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In 1992 a buyer agreed to purchase part of a large parcel of 37,536 m². The part had not yet been surveyed, so the contract gave an estimate, "approx. 4,000 m²", and a provisional price of 150,000 Deutschmarks, to be adjusted once the surveyors had done their work. The survey produced 5,606 m², and the dispute went all the way to Germany's Federal Court of Justice (Bundesgerichtshof, BGH). On 30 January 2004 (case V ZR 92/03) the court held that where both parties assumed the marked-out area had a particular size, a deviation from that size can justify adjusting or even unwinding the contract under the doctrine of the "basis of the transaction" (Wegfall der Geschäftsgrundlage).
The 30 September 2011 decision V ZR 17/11 concerned an exchange of land with a municipality. A deed described the unsurveyed area marked on its attached plan as approximately 28,699 m²; the measured area was 18,632 m². The plan defined the land to be transferred. Separately, the parties’ assumption of an approximately equal-area exchange could support adjustment of the bargain. The court distinguished these questions rather than treating every approximate area as legally irrelevant (paragraphs 9–16).
If you are buying in Germany from abroad, these two cases explain why "how big is this plot?" has more than one answer. This guide shows which figure is official, where you can read it yourself in English-unfriendly German portals, why the estate agent's listing (Exposé) often says something else, when a shortfall gives you any legal claim, what a boundary survey costs, and how to protect yourself in the notarised contract. Legal position as of 2 November 2026.
A short glossary
| German term | What it means for you |
|---|---|
| Liegenschaftskataster | the land cadastre, kept by each federal state's surveying administration |
| ALKIS | the digital cadastre system used in all states |
| Flurstück | a cadastral parcel; the unit that has an official area |
| amtliche Fläche | the official area of a parcel in m² |
| Grundbuch | the land register, kept at the local court (Amtsgericht) |
| Bestandsverzeichnis | the first section of the land register, listing the parcels and their size |
| Exposé | the agent's sales brochure; not an official document |
| Katasteramt / Vermessungsamt | cadastre or surveying office |
| ÖbVI (Öffentlich bestellte/r Vermessungsingenieur/in) | a publicly appointed licensed surveyor who may carry out official boundary surveys |
| Grenzfeststellung, Abmarkung | official determination of the boundary and marking it with stones or markers |
Source: Figures from this guide, documented under “Sources”
If you don't yet know the parcel number, start with Find the parcel number.
Four numbers, one plot
A buyer typically sees the size in four places.
| Where the figure appears | Where it comes from | What it proves |
|---|---|---|
| Cadastre (ALKIS), parcel record | state surveying administration | the official area of the parcel |
| Land register, Bestandsverzeichnis, column "Größe" | copied from the cadastre | the same figure again |
| Listing, Exposé, agent | the seller, often rounded or added up | nothing official |
| Your own measurement on a map | clicks on a screen | an approximation |
Source: Figures from this guide, documented under “Sources”
Two points surprise many foreign buyers. First, the land register does not calculate anything; it takes the area from the cadastre. If both agree, you have seen one number twice. How to read that entry is explained in Find your parcel in the land register and German land registry extract explained.
Second, the official area is not always the product of a modern survey. The Hessian surveying administration's guideline on area calculation states that the area recorded in the cadastre is the official area, given in square metres (with two decimals only for areas under 0.50 m²), and that the standard method is calculation from the coordinates of the boundary points. But Brandenburg's official update form (Fortführungsbeleg) lists several ways an area may have been determined: from defining points, graphically, proportionally, by input, as a remainder by subtraction, and as the "book area" (Buchfläche). Older areas taken graphically from historic maps can change when the cadastre recalculates them.
The BGH cases above illustrate why the incorporated plan and the contractual description must be read together: a numerical area correction and a change to the legal boundary are different questions.
Why the listing and the cadastre disagree
- Several parcels. A property may consist of a main parcel plus a narrow strip for a driveway or garage. The Exposé adds them up, sometimes including a parcel that is not for sale.
- Shared access roads. A one-quarter share in a 120 m² private lane is 30 m² on paper, but it is not 30 m² of garden.
- Part of a parcel. If you buy part of a parcel, there is no official area until it is surveyed, only an estimate, as in V ZR 92/03. The procedure is described in Dividing a plot.
- Rounding. 587 m² becomes "approx. 600 m²".
- Recalculated old areas. The boundaries stay, the figure changes.
A real example: area corrections in Dresden
The city of Dresden publishes cadastral changes in its official gazette (Amtsblatt) under § 14(6) of the Saxon Surveying and Cadastre Act. The notices list the type of change separately, including "Berichtigung der Flächenangabe" (correction of the stated area) and "Berichtigung eines Zeichenfehlers" (correction of a drawing error), each with the cadastral district and parcel numbers. Issues from 2026 list area corrections in districts such as Langebrück, Loschwitz and Stetzsch. According to the notices, a change is deemed notified seven days after the end of the public display period, and a correction of a drawing error can be challenged by objection (Widerspruch) within one month of notification.
For you, this means an area correction can arrive between the viewing and the notary appointment, or after you have bought. It changes the number, not the boundary.
How to check the size yourself, step by step
- Get the parcel identifiers. Ask the seller or agent in writing for the Gemarkung, Flur and Flurstück numbers of every parcel included in the sale.
- Look up the official area online. Most state geoportals show the parcel identifier and often the official area when you click on a parcel. Interfaces are usually German only; Compare geoportals helps you find the right one.
- Order an official cadastre extract. It states the area authoritatively. What each state offers, and at what fee, is in Cadastral map extract by federal state.
- Compare with the land register. The "Größe" in the Bestandsverzeichnis should match the cadastre for each parcel. If not, an update has not yet been carried over.
- Add up only what is in the draft contract. Treat co-ownership shares separately.
- Ask how the area was established. The cadastre office can tell you whether the boundary points come from a recent survey with coordinates or from older records.
- Compare on site. Fences and hedges are not proof of the boundary line.
A note on units for buyers used to imperial measures: 1 m² is about 10.76 sq ft, and 1 hectare (10,000 m²) is about 2.47 acres. A 30 m² shortfall is roughly 323 sq ft.
The measuring tool in an online map gives a rough check. A few square metres of difference means nothing; 15 per cent is a reason to ask questions.
When a shortfall matters in law
The area must be in the notarised deed
Under German law a property is defective if it lacks the agreed quality (§ 434(2), first sentence, no. 1 of the Civil Code, BGB). The key question is whether the area was agreed at all.
The BGH answered this for property sales on 6 November 2015 (V ZR 78/14): a description of a property's features by the seller before the contract that is not reflected in the notarial deed does not, as a rule, create an agreed quality. The case concerned a living area shown in floor plans and advertising but not included in the contract. The ruling applied the earlier wording of § 434 BGB; the agreed-quality rule now sits in § 434(2).
What this means if you come from a country where the agent's particulars carry legal weight: in Germany, the figure in the Exposé usually binds no one. Only what the notary reads out and you sign counts, and an "approx." figure in the deed was not treated as an agreed quality in V ZR 17/11.
The standard exclusion of liability
Almost every notarised contract for a used property excludes the seller's liability for defects. The BGH has held that such an exclusion also covers qualities a buyer could expect from the seller's public statements (V ZR 23/15, 22 April 2016; V ZR 274/16, 9 February 2018). It does not protect a seller who fraudulently concealed a defect or gave a guarantee (§ 444 BGB). You would have to prove the seller knew the figure was wrong, which is hard.
Without a defect: the basis of the transaction
If both parties assumed a particular size and were wrong, § 313 BGB (disturbance of the basis of the transaction) can support a price adjustment or, as a last resort, withdrawal. That was the route in V ZR 92/03. In V ZR 17/11 the BGH found that the lower court had wrongly denied the buyer this route, while stressing that the statutory allocation of risk cannot simply be bypassed through § 313. Expect a lawsuit, not an automatic refund.
Protecting yourself in the contract
If you pay by the square metre or need a minimum size to build, put it in the deed. Your notary will draft the wording; three common approaches:
- Area as an agreed quality: "The seller owes a plot area of 587 m² according to the cadastre." The general exclusion of liability then has to carve this out.
- Price per m² with adjustment: standard when you buy part of a parcel.
- Tolerance clause: deviations up to a stated number of m² do not affect the price.
German notarial deeds are read out in German. If your German is not fluent, tell the notary in advance so the appointment can be planned with an interpreter, and ask for the draft early enough to have it translated. For a notarised consumer contract concerning real property, the officiating notary or their representative should normally make the intended text available to the consumer two weeks before signing (§ 17(2 a) of the Notarisation Act, BeurkG). The process is described in Notary process and closing.
Worked example: what 30 m² costs
Assumed figures: the listing says 620 m², the cadastre says 590 m², and the standard land value (Bodenrichtwert) for the zone is €420/m². How to look up that value is explained in Land value and Bodenrichtwert.
| Item | Calculation | Amount |
|---|---|---|
| missing area at land value | 30 m² × €420 | €12,600 |
| real estate transfer tax on it, Bavaria | €12,600 × 3.5% | €441 |
| real estate transfer tax on it, North Rhine-Westphalia | €12,600 × 6.5% | €819 |
| total in NRW | €12,600 + €819 | €13,419 |
Tax rates as listed in our Buying land in Germany guide (as of 2 November 2026).
For a building plot, the second calculation often matters more. If the local development plan sets a site coverage ratio (Grundflächenzahl, GRZ) of 0.4:
- 620 m² × 0.4 = 248 m² of permitted footprint
- 590 m² × 0.4 = 236 m²
You lose 12 m² of footprint. If your architect has designed a house, garage and terrace up to the limit, that can be the difference between approval and refusal. Ask your architect which plot area the building authority will use before you rely on any figure.
Boundary surveys and what they cost
The cadastre tells you the area. It does not show you where the line runs on the ground. Two official services exist:
- Boundary indication (Grenzanzeige): the recorded boundary points are set out and shown on site.
- Boundary determination with marking (Grenzfeststellung mit Abmarkung): the boundary is formally determined, neighbours are invited, and the points are marked.
Who carries out the work depends on the state: state surveying offices, district or city cadastre offices, or licensed ÖbVI surveyors. Details are in Boundaries and land survey. Fees are set by each state; two examples.
Bavaria. You apply to the local Office for Digitalisation, Broadband and Surveying (Amt für Digitalisierung, Breitband und Vermessung). According to the BayernPortal service description, the fee depends on the number of old and new boundary points determined on site. Under § 3 of the Bavarian surveying fee regulation (GebOVerm): €330 for the first point, €100 each for points 2 to 30, €80 each for points 31 to 100 and €65 each thereafter. Priority handling costs 20 per cent extra, and fees for the local boundary officials (Feldgeschworene) who set the markers may be added.
For four boundary points the base point fee is€330+3 ×€100=€630. This must be multiplied by the land-value factor under §7 GebOVerm: for example 1.0 at over€5 to€25/m², but 2.0 at over€200 to€500/m². At an assumed€420/m², the point component is therefore€630 × 2.0=€1,260; priority handling adds 20%, giving€1,512 before any further charges. The€630 base is not a general final price for a building plot.
North Rhine-Westphalia. Fees follow the Surveying and Valuation Costs Regulation (VermWertKostO NRW), current version dated 1 January 2026. The City of Münster explains that the fee for a boundary survey consists of a basic fee plus a component depending on the number of boundary points examined and on the standard land value; the service is subject to VAT. A value factor of 1.0 applies up to a land value of €80/m² and rises above that, so the same survey costs more in an expensive town than in the countryside. Ask the cadastre office or an ÖbVI for a quote first; both charge under the same regulation.
What to do if …
… the listing shows more than the cadastre? Before the notary appointment, this is a negotiating point. Show the official extract and negotiate on the official figure, or insist on a price per m² or an agreed area in the deed.
… the land register and cadastre differ? The register has probably not been updated yet. Ask the cadastre office whether an update is pending and ask the notary to cite the current cadastre area.
… the fence is not on the boundary? Ask for a boundary indication before you buy and agree who pays. If a neighbour's building stands on the plot, get legal advice; that is a separate issue (encroachment, Überbau).
… you are buying part of a parcel? Insist on a site plan attached to the deed, a price per m² adjusted after the survey, and a clause on who pays for the survey.
… you live abroad and cannot attend? Ask the notary early whether you can sign through a representative and in which form the power of attorney must be given. Checking the area does not require you to travel: geoportal, cadastre extract and land register extract can all be obtained from abroad, the last two through the seller or with the seller's authorisation.
… you suspect the seller misled you? Keep the Exposé, emails and the online advert. Fraud requires proof that the seller knew the figure was wrong. That is a question for a German property lawyer.
What the GrundCheck report shows
The GrundCheck report compiles, for the parcel you mark on the map, the development plan or the inner/outer area status, protected areas, flood and other hazard maps, the standard land value and location data, each with source and date, in English or German. It helps identify planning constraints and questions for your adviser. It does not measure the plot, it does not replace an official cadastre extract or a boundary survey, and it is not legal advice.
Check the development plan, protected areas and risks for your parcel in the GrundCheck report, from €29 → · See a sample report
This guide is a first orientation and not legal advice for your individual case.
Sources
- German Civil Code (BGB), §§ 313, 434, 444, gesetze-im-internet.de (1); gesetze-im-internet.de (2); gesetze-im-internet.de (3), retrieved via search engine, 2 Nov 2026.
- Hessian Administration for Land Management and Geoinformation, guideline on area calculation, hvbg.hessen.de, retrieved via search engine, 2 Nov 2026.
- Brandenburg, update form (Fortführungsbeleg, Annex 1), bravors.brandenburg.de, retrieved via search engine, 2 Nov 2026.
- City of Dresden, official gazette, public display under § 14(6) SächsVermKatG, e.g. dresden.de (1); dresden.de (2), retrieved via search engine, 2 Nov 2026.
- BayernPortal, boundary determination, bayernportal.de; Bavarian GebOVerm § 3, gesetze-bayern.de, retrieved via search engine, 2 Nov 2026.
- VermWertKostO NRW, version of 1 Jan 2026, recht.nrw.de; City of Münster, surveying costs, stadt-muenster.de, retrieved via search engine, 2 Nov 2026.
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Notarisation Act (BeurkG), § 17(2 a), gesetze-im-internet.de, retrieved via search engine, 2 Nov 2026.
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BGH V ZR 92/03, Volltext / full judgment: bundesgerichtshof.de, 2.11.2026.
- BGH V ZR 17/11, Volltext / full judgment: bundesgerichtshof.de, 2.11.2026.
- BGH V ZR 78/14, Volltext / full judgment: bundesgerichtshof.de, 2.11.2026.
- BGH V ZR 23/15, Volltext / full judgment: bundesgerichtshof.de, 2.11.2026.
- BGH V ZR 274/16, Volltext / full judgment: bundesgerichtshof.de, 2.11.2026.
- GebOVerm §7, Bodenwertfaktor / land-value multiplier: gesetze-bayern.de, 2.11.2026.
- BauNVO §19, Grundfläche / site coverage: gesetze-im-internet.de, 2.11.2026.