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Knowledge for landlords

The Rentprime guide.

Practical know-how for landlords: service charge statement, German heating regulation, CO₂ cost allocation, German operating-costs regulation. Free, no registration — and if researching it yourself is too tedious, Rentprime takes over the calculations directly.

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Tenancy & tenancy law

10 Article on this topic

How much rent may I charge?

Rent cap, rent index, capping limit — step by step to the permissible rent.

Rent control (Mietpreisbremse)Mietspiegel (rent index)permissible rent

Rent increase 2026 — how often and how much?

Three permissible routes: comparative rent, index rent, modernisation. With a letter template.

rent increaseCommon lawIndexmiete (index-linked rent)

Rent index 2026 — what landlords need to know

Understanding the rent index: Berlin, London, Munich, Cologne. How to read and use it.

Mietspiegel (rent index)Vergleichsmiete§558c BGB

Rent reduction — what landlords now need to do

When may the tenant reduce the rent, by how much and how quickly must you react?

Rent reductionCommon lawMangel-Anzeige

Cosmetic repairs — who really pays

Federal Court of Justice turnaround since 2015: old clauses mostly invalid. What is still possible today.

Cosmetic repairsSupreme Court 2015renovation tenant

Withholding the deposit — when are you allowed to?

How much, for what, for how long? With a statement template and an overview of deadlines.

Rental depositGerman Civil Codedeposit refund

Terminating a tenancy as a landlord — legally sound

Personal use, without notice, realisation — all routes with deadlines + formal requirements.

termination for personal useCommon lawtermination without notice

Stepped vs index rent — which protects better?

Automatic rent increase without the tenant's consent — the comparison.

Staffelmiete (graduated rent)Indexmiete (index-linked rent)§557a BGB

Insuring against rent loss — what really helps

5 protection mechanisms compared by cost + effectiveness.

Loss of rentLoss-of-rent insuranceguarantee

Selecting tenants — the right questions

What you may LEGALLY ask, what is prohibited, creditworthiness & self-disclosure.

Tenant selectiontenant self-disclosureSchufa landlord

Service-charge statements & law

7 Article on this topic

Create your own service-charge statement

Step by step: what to include, allocation key, German heating regulation, CO₂, German Civil Code deadline.

Utility billingGerman operating-costs regulationGerman Civil Code

What may I pass on to the tenant?

All 17 German operating-costs regulation cost types + the top 10 mistakes that render a statement invalid.

German operating-costs regulationapportionable costsStreitpunkte

German operating-costs regulation in detail

Detailed overview of all apportionable operating costs — with common points of dispute.

German operating-costs regulationService Charges

CO₂ cost allocation tier model 1–10

The 10 levels explained — with worked examples for gas, oil, pellets and heat pumps.

CO₂ Cost Allocation ActStufenmodellLandlord's share

German heating regulation — what has changed

Heating Costs Ordinance amended in 2022. End of 2026: mandatory remotely readable meters.

Heat Network Regulations 2014Heat Network Regulations 2014Heat Network Regulations 2014

Service charges vs operating costs — what is apportionable

Splitting WEG service charges into apportionable vs non-apportionable, with a worked example.

Service charge (condominium)WEGallocable costs

WEG management — what owners need to know

WEG reform 2020, owners' meeting, resolutions, obligations as a condominium landlord.

WEGowners' meetingWEG-Reform 2020

Tax, HMRC & GDPR

5 Article on this topic

Depreciation (AfA) for property — landlord's tax guide

2% standard, 3% new build, special depreciation — with a worked example.

AfA Immobilien§7 EStGSteuererklärung Vermietung

Keep receipts for 10 years — HMRC digital

Instead of binders: archive digitally in an audit-proof way. With a tax-audit checklist.

HMRCHMRCBelegaufbewahrung

GDPR as a landlord — what you need to know

5 obligations + 7 common mistakes when processing tenant data.

GDPR landlordArt. 28 UK GDPR + DPA 2018AVV contract

Energy performance certificate requirement 2026

Demand-based vs consumption-based certificate, mandatory details in listings, fines.

Energy performance certificateGEG landlordPflichtangaben

Sustainable letting — what pays off?

Heat pump, PV, insulation — compare the economics with KfW funding.

Energetische SanierungKfW fundingCO₂-Reduktion

Landlord practice & tools

4 Article on this topic

Reminder to tenants — legally sound template

Three-stage dunning with template: payment reminder, first reminder, notice of termination.

reminder tenantVerzugtermination without notice

Software for private landlords — what matters?

For 1–10 flats: 7 essential features + what to look for when comparing providers.

Privatvermieter SoftwareRental management1-10 flats

Community of heirs with a let property

What you must do in the first 30 days — and how to divide the bookkeeping cleanly.

Community of heirsCommon lawMieteinnahmen versteuern

Excel vs software — when is switching worth it?

Excel is free and flexible — but when does switching to software make sense?

Excel vs SoftwareExcel ersetzenLandlord Software

Comparisons

Rentprime vs competitors.

When Rentprime is the right fit

Honest positioning vs. all-rounders, specialists and Excel templates.

View comparison

Service-charge statement step by step

Complete guide with examples and deadlines for landlords.

View comparison

German operating-costs regulation — 17 cost types

Which costs are allocatable, which are not? Table with explanations.

View comparison

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