Checklist: Confirm a condo Sondereigentum heating renovation qualifies for KfW 458 (applications live end‑Sep 2026)

What KfW 458 covers for condominiums (Sondereigentum)

KfW product 458 ("BEG Heizungsförderung für Privatpersonen – Wohngebäude") applies to private owners of condominiums when the heating replacement is implemented in the Sondereigentum (the individual apartment or Teileigentum area identified in the Teilungserklärung/Aufteilungsplan). The KfW product page and product information make this explicit and describe the grant structure (basic grant plus possible bonuses). Applicants must use the KfW customer portal "Meine KfW" to apply. ([kfw.de](https://www.kfw.de/inlandsfoerderung/Privatpersonen/Bestehende-Immobilie/F%C3%B6rderprodukte/Heizungsf%C3%B6rderung-f%C3%BCr-Privatpersonen-Wohngeb%C3%A4ude-%28458%29/?utm_source=openai))

Key seller documents to ask for (what proves the work was in Sondereigentum)

Request these original documents from the seller (digital PDF copies are usually sufficient for due diligence):

- Current Grundbuchauszug (land‑registry extract) showing the seller as owner and the investment address — KfW requires ownership information for bonus claims and identity checks. ([kfw.de](https://www.kfw.de/inlandsfoerderung/Heizungsf%C3%B6rderung/Nachweiseinreichung/Checkliste-Nachweiseinreichung-458-EFH-WEG.html)) - Teilungserklärung and Aufteilungsplan (declaration of division / plan) to demonstrate whether the relevant heating components lie in Sondereigentum or Gemeinschaftseigentum; the Teilungserklärung legally defines Sondereigentum. ([kfw.de](https://www.kfw.de/PDF/Download-Center/F%C3%B6rderprogramme-%28Inlandsf%C3%B6rderung%29/PDF-Dokumente/Kompendium_DDIV.pdf?utm_source=openai)) - Final invoices for purchase and installation of the heating system (end‑invoices only — KfW does not accept partial/interim invoices, offers or receipts). Each invoice must show the name of the grant recipient (as on the KfW Zusage) and the investment address. ([kfw.de](https://www.kfw.de/inlandsfoerderung/Heizungsf%C3%B6rderung/Nachweiseinreichung/Checkliste-Nachweiseinreichung-458-EFH-WEG.html)) - The installer’s "Bestätigung nach Durchführung" (confirmation after completion) and its BnD‑ID issued via the KfW experts portal — this is required to prove the measure was completed and eligible. Keep the BnD‑ID (it is requested when uploading evidence). ([kfw.de](https://www.kfw.de/inlandsfoerderung/Heizungsf%C3%B6rderung/Nachweiseinreichung/Checkliste-Nachweiseinreichung-458-EFH-WEG.html)) - For any bonus claims: Meldebescheinigung (residence registration) and, for the income bonus, certified income tax assessments for the required years. ([kfw.de](https://www.kfw.de/inlandsfoerderung/Heizungsf%C3%B6rderung/Nachweiseinreichung/Checkliste-Nachweiseinreichung-458-EFH-WEG.html))

Timing traps and procedural musts

There are several timing and process risks that commonly trip up buyers who rely on seller documents:

- Apply before work begins: the subsidy must generally be applied for before the measure starts. Do not rely on retrospective applications. The KfW product information stresses the "before start" requirement. ([kfw.de](https://www.kfw.de/PDF/Download-Center/F%C3%B6rderprogramme-%28Inlandsf%C3%B6rderung%29/PDF-Dokumente/6000005131_M_458.pdf?channel=MSN&utm_source=openai)) - Identification first: KfW requires successful identification (e.g., via Meine KfW procedures such as VideoIdent/eID) before you can upload evidence and receive payment. Complete identification early. ([kfw.de](https://www.kfw.de/inlandsfoerderung/Heizungsf%C3%B6rderung/Nachweiseinreichung/Checkliste-Nachweiseinreichung-458-EFH-WEG.html)) - Experts portal timing: installer confirmations (Bestätigung nach Durchführung) are created via the KfW experts portal; KfW documents show the experts portal for heating starts on 25.09.2026 — if works happened recently, confirm the installer can issue the BnD via the experts portal once it is live. If the installer cannot or will not provide the portal confirmation, the claim may fail. ([kfw.de](https://www.kfw.de/partner/KfW-Partnerportal/Multiplikatoren/Online-Best%C3%A4tigung/Info-Expertenportal/index.jsp?utm_source=openai)) - Final invoice only and applicant name: KfW accepts only final invoices and requires the invoice to name the Zuschussempfänger exactly as on the Zusage and to show the investment address. Missing or mismatched names/address are common rejection reasons. ([kfw.de](https://www.kfw.de/inlandsfoerderung/Heizungsf%C3%B6rderung/Nachweiseinreichung/Checkliste-Nachweiseinreichung-458-EFH-WEG.html)) - Bonus‑proof windows: for applicants who sought the income bonus under the 21.07.2026 conditions, KfW warns that evidence submission may only be possible from January 2027 — check deadlines in your case. ([kfw.de](https://www.kfw.de/inlandsfoerderung/Heizungsf%C3%B6rderung/Nachweiseinreichung/Checkliste-Nachweiseinreichung-458-EFH-WEG.html))

Practical checklist for the buyer/investor (one‑page)

Before signing or when doing post‑contract checks, confirm and collect:

- Current Grundbuchauszug and seller identity; copy of notarised sale contract if needed. - Teilungserklärung / Aufteilungsplan to check whether the heating components are Sondereigentum. - Final invoices for equipment and installation (name and investment address must match). - Installer BnD confirmation and its BnD‑ID (or evidence the installer will issue it via the experts portal once live). ([kfw.de](https://www.kfw.de/inlandsfoerderung/Heizungsf%C3%B6rderung/Nachweiseinreichung/Checkliste-Nachweiseinreichung-458-EFH-WEG.html)) - Seller confirmation of whether any work affected Gemeinschaftseigentum and WEG minutes or resolutions if relevant (KfW has special rules for WEG applications and WEG‑verwalter representation). ([kfw.de](https://www.kfw.de/PDF/Download-Center/F%C3%B6rderprogramme-%28Inlandsf%C3%B6rderung%29/PDF-Dokumente/Meine-KfW/6000005164_458_459_522_Ergaenzende_Bedingungen_WEG_Unternehmen_Meine_KfW.pdf)) - Copies of Meldebescheinigung and tax documents if seller claimed bonuses you may want to rely on. Keep digital PDFs and verify legibility before upload. ([kfw.de](https://www.kfw.de/inlandsfoerderung/Heizungsf%C3%B6rderung/Nachweiseinreichung/Checkliste-Nachweiseinreichung-458-EFH-WEG.html))

When to get professional help

If the Teilungserklärung is ambiguous (heating pipes or controls declared as Gemeinschaftseigentum despite serving a single apartment) or if WEG minutes show dissent, ask a German notary or a specialized WEG lawyer. For tax‑sensitive bonus claims or complex ownership chains, consult a tax advisor. This article does not provide legal, tax or investment advice.