Editorial update: · Richter Immobilien-Transaktionen
An old sales brochure, a building plan and a property-tax declaration may show different floor areas for the same house. Before marketing your property, establish what each figure includes. This guide explains how owners in Germany can prepare a traceable calculation and resolve questions about additional rooms.
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Start with the evidence behind each figure
Imagine an owner preparing to sell a terraced house in Düsseldorf. The previous sales brochure states 142 square metres, the original plans show individual room sizes, and the property-tax paperwork contains another total. Choosing the largest number would leave the real question unanswered: what space does that number describe? A reliable sales description starts with the documents behind the figures, before the listing is written.
Collect any existing living-area calculation, dimensioned floor plans, sections through the roof and records of later alterations. Include relevant permits and amended drawings where available. An old brochure is useful evidence of what was once advertised, but it is not a substitute for a calculation. Nor does the fact that a previous owner obtained a mortgage establish that every room was measured or its residential use checked.
Make a short comparison list. For each figure, note its date, source, stated method and treatment of the terrace, loft and basement. Identify changes since that date, such as internal insulation, a converted attic or a revised room layout. This turns an argument about competing totals into specific questions that can be answered. You may discover that one total includes a full terrace while another applies a percentage.
Our guide to living-area calculations for German property tax explains the tax context. For a sale, you also need a description that matches the actual building. A tax assessment does not prove that a converted space may lawfully be occupied as residential accommodation. Keep the original documents intact and mark uncertainties on working copies.
Choose a clear measurement basis
German property documents use several area concepts. Wohnfläche means living area calculated on a particular basis; the physical floor area of a room is not necessarily counted in full. Additional storage, utility or garage space must also be distinguished from living area. A combined figure described as living and usable space does not tell a buyer the size of the residential accommodation alone.
The Wohnflächenverordnung, usually shortened to WoFlV, is Germany’s Living Area Ordinance. Section 1 defines its direct statutory scope by reference to housing promotion legislation. It does not impose one universal measurement obligation on every private house sale. Nevertheless, a calculation prepared consistently under this ordinance provides an understandable basis when the method is expressly identified. The intended contractual description must also be considered. The rules can be checked in the official WoFlV text.
If you already have an area schedule labelled DIN 277, do not simply relabel its total as living area. Ask which categories it contains and how they differ from the proposed sales figure. Equally, do not combine selected favourable elements from different systems. A number calculated partly under one method and partly under another is difficult to reproduce or compare.
Age alone does not invalidate an old calculation. Section 5 WoFlV contains a transitional rule for calculations made under the Second Calculation Ordinance by 31 December 2003, with provisions for subsequent alterations requiring recalculation. This is not blanket protection for every historic brochure figure. Establish the actual method and building history before deciding whether an existing document remains suitable.
Separate residential rooms from ancillary and unresolved space
Under section 2 WoFlV, the starting point is the floor area of rooms belonging exclusively to the dwelling. Living rooms, bedrooms, kitchens, bathrooms and internal hallways are familiar examples. Their inclusion does not mean that every square metre automatically receives full credit: ceiling height and other calculation rules still matter. Storage within the dwelling also needs to be distinguished from ancillary storage outside it.
The ordinance excludes specified ancillary rooms, including basement rooms, laundry rooms, heating rooms, attic storage and garages. These spaces may be valuable to a buyer without being living area. Describe the workshop, storage provision or parking arrangement clearly and show the relevant figures separately. A radiator, a sofa or an attractive floor finish does not by itself convert a basement room into qualifying residential accommodation.
A converted loft or a supposed separate basement apartment raises another question: is the residential use lawful? WoFlV excludes rooms that fail the building-law requirements applicable to their use. In North Rhine-Westphalia, the state building regulations, including sections 46 and 60, address habitable rooms and the permit framework. Measurement alone cannot answer these questions.
Missing paperwork does not automatically prove an unlawful conversion. Have a suitably qualified professional compare the building file with the actual property. Until the issue is resolved, avoid presenting the disputed space as confirmed additional living area. Calling it usable space is also no reason to conceal a known restriction. Explain what exists and what remains uncertain, so that the buyer can assess the property on an informed basis.
Check dimensions before applying percentages
A living-area calculation has two distinct stages: measuring the relevant floor areas and deciding how much of each area counts. Under section 3 WoFlV, measurements generally use the clear dimensions between the finished faces of building elements. The outside dimensions of the house therefore do not establish its living area. Multiplying its external length by its width produces a different kind of figure.
Sloping ceilings require particular care. Section 4 WoFlV counts areas with a clear height of at least two metres in full. Areas at least one metre but below two metres count at half their floor area; areas below one metre do not count. A loft plan should make these height zones understandable. A room’s overall length and width, with no indication of the sloping parts, cannot explain the final allowance.
Balconies, loggias, roof gardens and terraces normally count at one quarter under this method, with a maximum of one half. A higher allowance needs an explanation appropriate to the particular property. It should not be selected simply to make the headline figure larger. Conservatories that cannot be heated count at half their area, provided the other requirements for inclusion are met.
There are also detailed rules for stairs, recesses and structural projections. Stairs with more than three risers and their landings are excluded under WoFlV, while fitted kitchens and bathtubs are not automatically deducted. Ask for awkward areas to be recorded individually. If the calculation uses drawings, they must provide suitable dimensions and match the completed building. Section 3 requires a fresh determination by measurement or corrected drawings where construction differs from the drawing used.
Follow a worked example through to the total
For the Düsseldorf house, suppose the undisputed areas receiving full credit total 92 square metres. A further loft area, assumed here to be lawful residential accommodation, has a physical floor area of 40 square metres. Of this, 20 square metres have a clear height of at least two metres, 16 lie between one metre and below two metres, and four are below one metre.
The loft contributes 20 plus eight plus zero: 28 square metres of living area. A terrace belonging exclusively to the house measures 20 square metres and receives the standard quarter allowance in this example, contributing five square metres. The total is therefore 92 plus 28 plus five, or 125 square metres. The terrace allowance is already included and must not be added again elsewhere in the description.
There is also a 25-square-metre basement and an 18-square-metre garage. In this example both are shown separately as ancillary space. They give the house practical benefits beyond the living-area total, but adding them does not increase its residential living area. Buyers can understand their value through a clear plan, dimensions and an accurate explanation of the available use.
The difference from the old brochure’s 142 square metres is 17 square metres. That does not automatically establish a particular price reduction, nor does it make the discrepancy irrelevant. First establish why the original calculation differed. The property’s value also depends on its land, location, condition and other characteristics. Our guide to property valuation explains that wider assessment. Price-per-square-metre comparisons are meaningful only when the underlying area figures are sufficiently comparable.
Commission the specific work you need
Owners can organise the documents and check simple room dimensions themselves. Professional help becomes useful when roof geometry, undocumented alterations or contradictory calculations could materially affect the sale. Architects, building engineers and appropriately experienced surveyors may undertake this work. Check relevant experience and the proposed deliverable rather than relying on an impressive label for the service.
Explain that the calculation is intended for a house sale. Supply the available plans and list the differences already identified. Ask whether the work includes an on-site measured survey or only a calculation from supplied drawings. Clarify how ceiling-height zones, terraces and ancillary areas will be recorded. A service based solely on plans may be suitable when the plans are accurate, but cannot discover an unreported difference inside the building.
A useful result identifies the property, the parts examined, the date, the author and the calculation method. It includes a room schedule and dimensioned drawings or measurement sketches, together with the percentages applied. Assumptions and inaccessible areas should be clearly stated. A signed total without supporting detail gives a buyer less to work with than a transparent calculation whose scope is explained.
If the buyer’s lender requires a particular format or professional qualification, the buyer should confirm that requirement directly and early. No calculation guarantees mortgage approval. Equally, an area report is not automatically a review of planning or building-law compliance, and it does not replace advice on the sale contract. Agree the scope and fee before commissioning work; a universal cost estimate would be misleading for properties with very different documentation and complexity.
Keep the listing and contractual information consistent
Use the checked figure consistently in the property portal, brochure and viewing documents. Identify the calculation method and the date of the supporting schedule. Explain which ancillary areas are additional and which terrace allowance is already included. A prospective buyer should be able to match the advertised figure to the calculation without guessing which rooms were counted.
If an earlier figure has already been circulated, quietly replacing a PDF is a poor way to correct it. Give existing interested buyers a clear correction and the basis for the revised number. Retain the document versions and the relevant correspondence. This creates a record of what was communicated and when. The purpose is to make the factual position understandable, rather than bury the description under vague reservations.
German law assesses defects in the context of the contract and the surrounding circumstances. Section 434 of the German Civil Code sets out the relevant requirements for conformity. Under section 444, a seller cannot rely on an exclusion of liability in certain circumstances, including fraudulent concealment of a defect. Describing an area as approximate does not authorise a deliberately inaccurate statement.
Do not assume that a supposed ten-percent tolerance creates a universal safe margin for house sales. Any legal consequences need assessment in the individual case. Give the notary the current calculation and explain known discrepancies so that the intended contractual treatment can be discussed. If a dispute has already arisen, or you need advice on your own liability, consult a lawyer qualified to advise on the German transaction.
Turn the calculation into a practical sales decision
The final aim is a clear property description supported by a manageable set of documents. Assemble the current calculation, matching plans, separately stated ancillary areas and the relevant clarification for questionable rooms. Use consistent room names throughout. If the brochure calls a space a bedroom while the supporting plan calls it attic storage, the difference needs explaining before it becomes a surprise during negotiations.
Before marketing, check four things: is the method identified, does the calculation match the building, are ancillary areas and unresolved uses distinguished, and do all sales documents use the same version? Assign any remaining substantial question to the appropriate person and set an internal target date. That is a planning measure for your sale, not a statutory deadline applicable to every owner.
To discuss a planned sale, describe your situation through the property-owner enquiry form. Useful starting information includes the location, type of house, intended timing and whether a traceable calculation exists. Mention conflicting figures if they are part of the problem. This gives RICHTER Immobilien-Transaktionen a concrete basis for receiving your sales enquiry; technical measurement, building-law questions and legal advice belong with the relevant qualified professionals.
Use the house-sale checklist to connect this work with the rest of your preparation. A reliable area figure helps you explain the house, present additional space honestly and answer buyers’ questions with evidence. It supports informed price discussions without promising a particular selling price, a lender’s decision or a sale free from further questions.
