| ideeller Wert (m) | sentimental/special value |
| im Bau (m) befindlich | under construction / work in progress |
| im Namen (m) von | on behalf of |
| Immaterialgüter (pl) | intangible assets |
| immateriell | intangible |
| Immission (f) | ambient air pollution |
| Immobilie (f) | property / real estate |
| Immobilie (f), baufällig | derelict property |
| Immobilienaktiengesellschaft (f), börsennotiert | listed real estate company |
| Immobilienblase (f) | real estate bubble |
| Immobilienbranche (f) | real estate sector/industry |
| Immobiliendatenbank (f) | property database |
| Immobilienentwickler (m) | real estate developer |
| Immobilienfonds (m/pl) | estate fund / property fund(s) |
| Immobilienhändler (m) | real estate agent / estate agent (BE) / broker / realtor |
| Immobilienindex (m) | investment property index |
| Immobilieninvestor (m) | real estate investor |
| Immobilienleasing (n) | real estate leasing |
| Immobilienmakler (m) | real estate broker / realtor |
| Immobilienpreisspiegel (m) | real estate price comparison table |
| Immobilienrente (f) | income mortgage / personal income mortgage |
| Immobiliensachverständiger (m) | appraiser / valuer / surveyor |
| Immobilienspekulation (f) | real estate speculation |
| Immobilientreuhänder (m) | real estate agent / trustee |
| Immobilienverwalter (m) | real estate manager |
| Immobilienverwaltung (f) | real estate management |
| in Bewegung (f) setzen | move-on, to |
| in der Nähe (f) von | near to / close to |
| in Gründung (f) (i.G.) | currently being established |
| in Kraft (f) treten | enter into force |
| Inanspruchnahme (f) | claim(ing) / draw down (Kredit) / usage / execution |
| Inbesitznahme (f) | lawful entry/seizure |
| indexgebunden | index-linked |
| Indexmietvereinbarung (f) | rent indexation agreement / escalation lease |
| Individualverkehr (m) | traffic / car traffic |
| Industrieanlagebau (m) | plant engineering/construction |
| Industrieimmobilie (f) | industrial property |
| Inflationsrate (f) | inflation rate |
| Informationspflicht (f) | duty to supply information |
| Infrastrukturbereitstellung (f) | provision of infrastructure |
| Inhaber (m) (eines Wertpapiers) | bearer |
| Inländer (m/pl) | native / national / resident(s) |
| Innenausbau (m) | interior finish |
| Innenausstattung (f) | interior fit-out |
| Innenhof (m) | courtyard |
| Innenwand (f) | internal / interior wall |
| innergerichtlich | in-court |
| Inserat (n) | ad(vert) / advertisement |
| Insolvenz (f) | insolvency |
| Installateur (m) | plumber |
| Instandhaltung (f) | maintenance / preservation |
| Instandhaltungsarbeiten (pl), allgemeine | general maintenance |
| Instandhaltungsarbeitsrückstand (m) | maintenance backlog |
| Instandhaltungsfonds (m) | maintenance fund / repair fund |
| Instandhaltungskosten (pl) | maintenance costs |
| Instandhaltungsplan (m) | planned maintenance |
| Instandhaltungsrücklage (f) | maintenance reserve |
| Instandsetzung (f) | restoration / refurbishment / renovation / rehabilitation / reinstatement |
| Institutionalisierung (f) | institutionalization |
| interdisziplinär | interdisciplinary |
| Interessenvertretung (f) | lobby / representation of interests |
| Inventaraufnahme (f) | inventory taking |
| Investition(en) (f/pl) | investment(s) / (capital) expenditure(s) |
| Investitionsablöse (f) | redemption sum (redemption to compensate for investments) |
| Investitionsaufwand (m) | capital expenditure (capex) |
| Investitionsförderung (f) | investment incentive |
| Investitionsmethode (f) | investment method |
| Investitionsmittel (pl) | funds |
| Investitionstätigkeit (f) | investment activity |
| Investitionswert (m) | investment value |
| Irreführung (f) | deception / deceit |
| Irrtum (m) vorbehalten | errors and omissions excepted |
| Isolierung (f) | heat-insulation / thermal insulation / insulation |