Buying a house & financing it: the complete handbook (step by step)

What does a house really cost?

You do not buy a house with the purchase price, but with everything attached to it. In the end, that is far more than the number in the listing: the purchase costs, the interest on the loan, and from then on heating, insurance, property tax and the reserve for the first big repair every month. Every one of these figures can be calculated in advance, and that is exactly what this handbook is for.

It leads you from the first question of whether buying is worth it at all, through choosing the property and financing, to the key handover and your first months as an owner. Where a figure depends on your personal situation, you will find a matching calculator. Unlike many guides, this text sticks to the current 2026 figures and tells you where they come from and how long they hold.

Buy or rent?

Buying and renting are not purely a financial question, but the finances are the part you can decide on. The two currencies that matter are time and equity.

Buying pays off above all when four conditions come together: a long period of residence of realistically ten years or more, a stable income, enough equity for the purchase costs, and a good ratio of purchase price to rent. If one of them is missing, renting can be the better choice, because the capital not tied up can work elsewhere.

Two rules of thumb help you judge:

• Period of residence. The one-off purchase costs of 7 to 12 percent spread better the longer you live there. If you sell again after two or three years, you almost certainly lose money through the purchase costs.
• Price-to-rent ratio. Divide the purchase price by the annual cold rent; for a worthwhile purchase the value is usually below about 15 to 20. Above 25 to 30, renting often weighs heavier.

One point is often overlooked: the opportunity cost of the equity. If you put 100,000 euros into a house, you can no longer invest that money in the capital market. The rule of thumb therefore never compares only the payment with the cold rent, but the complete housing-cost calculation against the warm rent plus the possible return on the capital you put in.

The Housing-cost calculator sets your current rent against your future costs as an owner, and the Rent-vs-buy check looks at your individual situation more closely. The Inflation calculator shows how the nominally fixed payment changes in real terms over the years, while the rent rises.

The general tendency currently supports buying. The vdp property price index (based on real transactions from over 700 institutions) shows a sideways-to-slightly-rising development for 2026; condominiums rose by 2.6 percent in the second quarter and houses by 2.0 percent. New-contract rents rose more strongly than prices at 3.2 percent year on year. (As of: 2026-08-25, source: Verband deutscher Pfandbriefbanken, vdpresearch.de)

Property types and building form

Before you calculate figures, decide what you are actually looking for. The building form decides the purchase price, running costs and renovation risk.

A detached house in the existing stock is the biggest responsibility: you carry roof, heating, facade and plot alone. A terraced or semi-detached house is cheaper but brings neighbour rights, boundary distances and often a management company. Anyone who wants to build up ownership and stay flexible often starts with a condominium.

New build, existing or old building?

With the building form comes the second fundamental question: new, existing or in need of renovation. The three paths work out very differently.

A new build costs the most but saves energy and renovation costs and brings a residual warranty. A well-kept existing property is the compromise: ready to move into, but the energy condition decides your future heating costs. A cheap old building tempts with its price but demands a real renovation buffer, otherwise it swallows the money you saved.

The order of the calculation matters: it is not the purchase price that decides, but the purchase price plus all renovation and conversion work up to the condition you want. If you buy an old building and plan a heat pump plus insulation, you quickly reach the sum of a more modern property, but you can secure subsidy along the way.

Condominium or house?

When you buy an apartment instead of a house, you are not just buying floor space but a share in a community. Master three terms before you seriously consider a condominium:

• Declaration of division. It is the constitution of the complex: it sets out the shares of joint ownership, the special use rights for a parking space or garden, and the rules for structural changes. Read it before buying, especially the rules on renovations.
• Service charge (Hausgeld). This is your monthly advance payment to the community of owners, made up of running costs, a maintenance reserve and administration. As a guide, practice points to 3.00 to 4.50 euros per square metre per month. Much less can mean an underfunded reserve.
• Maintenance reserve. Its balance is almost never in the listing, so ask for it actively. A low balance in an old building means: the next special levy is coming.

The community meeting minutes of the last three years show you what the community has decided and plans. You hit already-decided special levies as a new owner, no matter when they were set. The Housing-cost calculator helps you count the service charge and running costs into your monthly plan.

Energy and renovation

The energy certificate is something like the health record of a building, and it is mandatory: since 2009 the seller must present it at the latest during the viewing, and the energy-efficiency class and value have been in the advertising since 2014. It is valid for ten years. The classes from A+ to H tell you at a glance how efficient a house is.

There are two variants: the consumption certificate, which looks at the actual consumption of the last three years, and the demand certificate, which works from the technical building data. For renovation planning, the demand certificate is always the more meaningful basis. If only a cheap online certificate is available, ask an energy adviser for an assessment for planning purposes. By the way: the seller must present the certificate unrequested at the viewing, a mere "available on request" in the listing is not allowed. If it is missing entirely, a fine of up to 10,000 euros under section 108 of the Building Energy Act threatens.

The value is at the same time your strongest negotiation argument. A poor energy certificate means a renovation backlog, and you can deduct that from the purchase price. The efficiency class can influence the selling price by up to 30 percent, with surcharges in classes A+ and A and clear deductions at G and H. The point is worth it: a class-H house uses more than eight times as much as an A+ and at 12 cents/kWh quickly costs you about 3,600 euros in heating per year instead of about 430 euros.

What renovation costs (guide, as of 2026):

Plus good news for buyers of an existing building: since the modernised Heating Act at the end of July 2026 there is no general obligation to replace functioning old oil and gas heating, and new heating can be chosen freely, as long as it gets progressively climate-friendlier (the so-called biomass stairway, see upcoming rules). If you want to renovate later, you can therefore plan calmly and take targeted subsidy with you. The Housing-cost calculator shows you what the energy value means for your monthly heating costs.

Purchase costs: the 16 federal states compared

The purchase costs are the biggest item that many buyers plan for too late. As a rule of thumb, allow 7 to 12 percent on top of the purchase price, depending on the state and the agent situation. They consist of four building blocks and are usually not financed, but must be available as equity.

The property transfer tax is the biggest difference between the states. This table shows the rate of all 16 federal states, calculated on a purchase price of 400,000 euros:

At a purchase price of 400,000 euros, Bavaria and North Rhine-Westphalia are therefore 12,000 euros apart, only because of the property transfer tax. One detail is worth asking the notary about: movable items bought along, such as a fitted kitchen, can be listed separately in the contract and then do not fall into the tax. Negotiating is worthwhile not only on the price.

The notary costs are calculated uniformly across the country under the Courts and Notaries Fees Act. Around 1.5 percent without financing, more like 1.5 to 2.0 percent with a registered land charge. The agent split has also been legally regulated since 23 December 2020: if the seller commissioned the agent, they must bear at least half. The usual share is 3.57 percent including VAT per side. The House purchase cost calculator works out the exact sum for your state and your purchase price.

What you can afford

Before choosing the property comes the honest answer to how much house fits your budget. The most common rule of thumb: your monthly loan payment should be at most 30 to 35 percent of your net household income, at worst 40. On top of that come the running housing costs, which further burden the budget.

This table shows you, based on the 35-percent limit, which maximum payment and loan fit your income:

The sensible loan amount in practice is below that, because banks hardly finance the purchase costs. The Gross-net salary calculator first gives you your clean net income from the gross, and the Household budget calculator records your real expenses and with them the question of what is actually left over each month.

For equity, a simple principle applies: at least 20 percent of the purchase price plus the purchase costs, more is better. Less is possible but costs measurable interest. If you finance over 90 percent loan-to-value, you pay around 0.4 percentage points more than with a share below 70 percent, according to the current tables. The Emergency fund calculator reminds you of the second important buffer: do not put your emergency fund of three to six months of expenses fully into the down payment, it stays your safety net.

The running costs of a home

After the purchase, the real calculation begins. Alongside the loan payment you carry running costs, property tax, insurance and the reserve for later every month. Anyone who hides these items underestimates the monthly burden quickly by several hundred euros.

The operating-cost index of the Deutscher Mieterbund (billing year 2024) lists an average of 2.67 euros per square metre per month for running costs. For a detached house comes the maintenance reserve and the insurance.

For the maintenance reserve, practice names two common rules: around 1 to 2 percent of the purchase price per year, or at least 2 euros per square metre per month (the latter serves as a floor). For a 400,000-euro house that is 4,000 to 8,000 euros a year, only to keep roof, heating and windows going. Many find this item hardest, because it does not come due every month visibly, but the first broken heating recovers it with compound interest.

The property tax has been newly calculated since the 2025 reform and differs greatly depending on the municipality. Many cities have raised their assessment rates sharply. The promised revenue neutrality applies only on average; in individual cases it can be clearly more expensive or cheaper.

Financing: annuitising, fixed-interest period and scenarios

German mortgage financing almost always runs through an annuitising loan. The trick: the monthly payment stays constant over the fixed-interest period, but its inner workings shift. At the start you pay almost only interest, towards the end almost only repayment. That is why the remaining debt falls so slowly at first.

You set two levers yourself: the initial repayment and the fixed-interest period. The repayment decides how quickly you pay off the debt. If you only repay 1 percent, you barely move: on 300,000 euros, barely 35,000 euros are repaid after ten years. Two percent is considered a sensible minimum, three percent shortens the term massively.

The fixed-interest period decides how long the bank guarantees the rate. Ten years are the standard and currently the cheapest, fifteen years cost about 0.3 and twenty years about 0.5 percentage points more. At the end of the period a remaining debt usually stays, which you then have to roll over at the rate then valid. That is exactly why many extend the period, when they do not want to leave the follow-on rate to chance.

On the current interest situation (as of August 2026): mortgage rates mostly move between 3.7 and 4.5 percent effective per year, ten-year fixed periods with good creditworthiness and loan-to-value around 3.8 to 4.1 percent. Longer periods cost slightly more step by step, fifteen years around 4.3, twenty years around 4.5 percent. The rate structure is currently inverted, short periods are more expensive than 10-year periods. If you save 0.1 percentage points, on a 400,000-euro loan that is around 33 euros a month, calculated over decades a four-figure sum.

The Mortgage calculator lets you run interest, repayment, fixed period and special repayments through for your own figures, and the Loan calculator generally helps with the payment calculation. Comparing several providers demonstrably pays off; the interest differences between banks can be half a percentage point or more.

KfW and state funding

The state helps with home ownership mainly through low-interest KfW loans, which however do not go directly to private individuals but run through your own bank. The application must be made before the project starts, so before the notarial contract. Three programmes count for buyers:

• KfW 124, home ownership programme. Low-interest loan of up to 100,000 euros for buying or building, the classic entry into home ownership subsidy. Check the current conditions on kfw.de, for example which properties and energy standards are funded, because the terms change regularly.
• KfW 300, home ownership for families. Low-interest loan for families with children under 18 when building a climate-friendly home, of up to 170,000 to 270,000 euros depending on the number of children, with income limits.
• KfW 261, BEG renovation. Loan of up to 150,000 euros per residential unit for renovation, with repayment bonuses depending on the efficiency standard achieved. In addition there is the heating subsidy KfW 458 for replacing the old heating.

One important note: the construction child benefit (Baukindergeld) was abolished; the final deadline for applications was 31 December 2023 (contract or planning permission by 31 March 2021). Its direct successor is today the low-interest loan KfW 300. If you buy in Hesse, you can additionally check the Hessengeld as a grant. Funding conditions change quickly, so check the concrete rates live on kfw.de before your decision.

The purchase phase step by step

Once the financing is clear, the actual purchase phase begins. A land purchase contract is only valid if it is notarised, regulated in section 311b of the German Civil Code. The notary checks the land register, draws up the draft and handles the registration. There is no 14-day right of withdrawal here, only the loan contract can be withdrawn within 14 days.

The typical sequence from viewing to key handover:

1. Request documents. Land register extract, cadastral map, energy certificate, heating cost bills, and for apartments the declaration of division and community minutes.
2. Viewing. Check the building fabric, heating, windows, roof. For older properties a building expert is worthwhile.
3. Work out the economics. Set the purchase price plus purchase costs plus running costs against your budget.
4. Fix the financing. Compare terms and have a financing confirmation ready for the notary appointment.
5. Check the notary draft. Read the draft carefully and clarify due date, handover date and warranty.
6. Notarisation. The contract is read out and signed, from then on there is a binding commitment.
7. Meet the conditions for payment. Register the priority notice, arrange the land charge and have old encumbrances removed.
8. Pay the price and hand over. Once fulfilled, the bank pays out, with a handover protocol, meter readings and keys.

One point is often underestimated: even without secured financing you sign a payment obligation at the notary, and a failing loan is no automatic ground to withdraw. That is why the financing confirmation belongs before the appointment. The Date calculator helps you not to miss deadlines such as the 14-day withdrawal period of the loan or the payment deadline for the property transfer tax.

Common mistakes when buying a house

Many mistakes repeat with astonishing regularity. If you know them, you avoid the most expensive:

• Comparing only the payment with the cold rent. The running housing costs are left out. The comparison only works through the complete housing-cost calculation.
• Buying without an equity buffer. The purchase costs are not planned for. At least 20 percent plus purchase costs from your own funds, more is better.
• Too high a burden. Over 40 percent of net income for the payment is risky, precisely because rates can rise.
• Too low a repayment. A 1 percent initial repayment stretches the term beyond 40 years and raises the follow-on financing.
• Asking only one lender. The interest difference works over decades, a comparison saves four figures.
• Skipping surveys and viewings. Structural defects become expensive; an expert assessment can pay for itself tenfold.
• Underestimating the period of residence. Anyone who sells again after a few years loses through the purchase costs.
• Forgetting the reserve. After the purchase the money for the first repair is missing, because nobody set aside.

New and upcoming rules

The law around housing changes, and for a house purchase looking ahead matters, because a house lasts decades. These are the current states and are decided or planned, as of early September 2026:

• Heating Act and the turn in July 2026. The original GEG of 2024 wanted new heating to run at least 65 percent on renewables. At the end of July 2026 the Building Modernisation Act (GModG) deleted this quota outright for new and existing buildings. Since then: functioning old oil and gas heating may keep running and be repaired, there is no forced replacement and no ban on operation after 2045. New gas and oil heating are allowed again, but must heat increasingly climate-friendlier, the so-called biomass stairway with 10 percent climate-neutral fuels from 2029, 15 percent from 2030, 30 percent from 2035 and 60 percent from 2040. For buyers this means: no acute pressure to act, but the running energy costs of fossil systems rise permanently through the CO2 price and the biomass stairway.

• EU Building Energy Performance Directive (EPBD). The revised directive took effect in May 2024 and had to be transposed into national law by May 2026, Germany plans to adopt it one to one. Specifically for residential buildings: new residential buildings must have a solar installation on the roof from 2029, and for comprehensive renovations, where more than 25 percent of the facade or roof is affected, stricter requirements apply from around 2027. There is no immediate obligation for existing houses, but the direction is clear.

• Property tax reform from 2025. Since 2025 property tax is calculated anew from the property value, assessment rate and multiplier, because the old model was based on unit values from 1964 (West) and 1935 (East). The aim was revenue neutrality, but in practice many municipalities have raised their multipliers sharply and many owners pay more. The multipliers of the cities are not directly comparable because of different valuation models. For buyers, the municipal property tax is a running item you should actively ask about before buying.

• Home ownership funding. The construction child benefit (Baukindergeld) was abolished; the final deadline for applications was 31 December 2023, with the condition that the purchase contract or building permit was in place by 31 March 2021. In its place have come the low-interest KfW loans 124 and 300. A new direct grant for the pure house purchase is not yet decided, stick to the current programmes on kfw.de.

These points are a snapshot. Laws and subsidy programmes change faster than some guides like to admit. Keep an eye above all on developments around heating, energy efficiency and property tax if you want to hold a property for many years.

After the purchase: moving, first setup and budget

With the notary appointment the purchase is not yet complete, the move into your first home follows. Especially for first-time buyers the tasks pile up here, and the costs are easily underestimated.

The Moving cost calculator works out the costs of moving companies, hired vans and packaging, and the First setup calculator calculates what furniture, kitchen and household goods really cost for the new home. Your Household budget calculator then takes over the running control, so that the first monthly payment was not the last surprise.

Anyone who plans long term also thinks of pension provision: a property ties up capital that could otherwise work for retirement. The Pension gap calculator shows you how buying a house and pension planning fit together.

Checklists for buying a house

These lists bring together the most important checks. One tick per point avoids expensive surprises later.

Before the viewing:

• Equity and emergency fund listed separately?
• Maximum monthly payment and loan limit calculated?
• Purchase costs for your state planned in?
• Property type and building form matching your life plan?
• Energy condition and heating prepared as a negotiating argument?

Finance check:

• Household budget recorded cleanly?
• Payment plus running costs under 35 to 40 percent of net income?
• Buffer for a rate rise after the fixed period planned?
• Special repayment and repayment rate negotiated?
• Two to three offers compared?

At the notary:

• Financing confirmation at hand?
• Draft read, due date and handover date clarified?
• Priority notice and land charge arranged?
• Warranty and inventory list understood?

At the handover:

• Handover protocol with meter readings and defects?
• Keys, documents and codes handed over?
• Insurances and property tax transferred?
• Maintenance reserve buffer set up?

Key terms when buying a house

• Annuitising loan. The standard loan with a constant monthly payment of interest and repayment, whose inner workings shift over time.
• Loan-to-value. The share of the loan in the value of the property, decisive for the interest rate.
• Lending value. The cautious value the bank sets, often below the purchase price.
• Equity share. The share of your own funds in the total costs, the mirror of the debt share.
• Energy-efficiency class. The letter from A+ to H on the energy certificate that classifies the efficiency of a house.
• Leasehold (Erbbaurecht). The right to use someone else's plot, usually for 50 to 99 years, against a running leasehold charge.
• Property transfer tax. The state tax on buying property, between 3.5 and 6.5 percent.
• Land charge. The right in rem with which the bank secures the loan, registered in the land register.
• Service charge (Hausgeld). The monthly advance payment of the owner to the community, including the reserve.
• Maintenance reserve. The money set aside for future repairs to the building.
• Special repayment. The right to repay an additional amount each year without a prepayment penalty.
• Declaration of division. The constitution of a residential complex with shares, special use rights and rules.
• Prepayment penalty. The compensation payment for early repayment of the loan outside the statutory special right.
• Fixed-interest period. The period for which the bank guarantees the rate, usually 10 to 20 years.