Estimated build time from start permit to completion, per building group (model)

Estimated months from igangsettingstillatelse to completion (MB, ferdigattest or tatt i bruk) per building group for a start next month, as p50 and p80 with survival and hazard curves, from a survival model fitted on the Matrikkel status history. An estimate, not a schedule.

build_time18 fieldsNot in the demo

Source: Approach build_time_estimate model (Weibull survival, model platform) on the Matrikkel status history
Geography: The address point
Reported stale after: 30 days
Access: Requires a separate agreement (Kartverket Matrikkel)
Contract version: 1
In packages: models

Status right now

State: Empty
The source was read but holds no rows. The section answers “no data”, not “no”.
Last loaded: 29 Oct 2026
Newest record: not measured
Municipalities with data: 0

Measured 29 Oct 2026. This is about the section as a whole, not one address: an address outside coverage still gets “not covered”, never “no”.

Available with: a separate agreement, switched on per account · Ask about an agreement

Model and method

How many months does it take from start permit to a finished building here?

This is model metadata from the contract. Results are estimates, not observed source facts. Declared maturity and reference comparison do not establish that the current model release is approved or available to the customer.

Result type: Model
Method: Machine learning
Declared maturity: Marked stable in the catalogue
Reference comparison: A reference is declared
Contract version: 1
Model artifact and runtime version: Not established by this catalogue description

Inputs, headline fields and comparison basis

Declared inputs

Matrikkel status history
Matrikkel building facts
MET build conditions

Headline output fields

p50_months, p80_months, survival, hazard

Declared comparison basis

Harrell's C and Kaplan-Meier calibration of p50/p80 on buildings held out of the fit

Input names are not a complete training dataset or revision-pinned lineage. Read the caveats and response metadata for what a particular result is based on.

Source terms and reuse

These are declarations from the catalogue contract, not a new rights approval. Customer access, source agreements and privacy need separate assessment. A licence label does not establish coverage or reviewed content.

Declared licence or terms: Kartverket Matrikkel
Declared redistribution: Agreement terms apply
Catalogue basis: Separate agreement

Attribution and note

Shown from the contract in its original language.

Served under a separate agreement; its terms decide what may be shown or passed on.

What this does not say

Quoted verbatim from the section’s warnings field, exactly as the API returns it. They are not translated: a translation would show something other than what your response actually contains.

Estimate, not a schedule: how long comparable buildings have taken in Matrikkelen from igangsettingstillatelse (the start permit, not the day work begins) to the first of midlertidig brukstillatelse, ferdigattest or tatt i bruk. Kommuner register completion with different diligence, so long tails partly measure registration.
The build_time_estimate model on the model platform: a Weibull accelerated-failure-time model fitted on right-censored build times (most recorded buildings are not finished yet, so a plain average would understate them), with building group, usable area, start quarter, the normal workable days of the six months from the start at the kommune's MET station, and the kommune's own level where it has at least 30 recorded buildings, else its fylke's, else the national one (stratum_level and stratum_code say which). One row per building group for a start next month; p50 and p80 are at the group's typical usable area (reference_bra_m2). survival[m-1] is the share still building after m months and hazard[m-1] the chance of finishing in month m for one still open after m-1, m = 1..48.
The validation block is the release's held-out figures on buildings the fit did not see: Harrell's C and the Kaplan-Meier share finished by each building's own p50 and p80 (0.5 and 0.8 when calibrated). A release is only activated after it passes every gate.
Sources: Kartverket Matrikkel (by agreement), MET Norway Frost (CC BY 4.0). Model: Approach.

Provider-contract fields

4 of 18 fields are value fields — the ones that decide whether a record actually says anything. The rest are context: identifiers, codes and timestamps.

Field	Type	Role
building_group	string \| null	context
start_month	integer \| null	context
start_period	string \| null	context
municipality_code	string \| null	context
stratum_level	string \| null	context
stratum_code	string \| null	context
reference_bra_m2	number \| null (m2)	context
workable_days_6m	number \| null (døgn)	context
condition_tercile	string \| null	context
p50_months	number \| null	value
p80_months	number \| null	value
survival	array<number> \| null	value
hazard	array<number> \| null	value
release_id	string \| null	context
artifact_sha256	string \| null	context
model_version	string \| null	context
validation	object \| null	context
updated_at	timestamp \| null	context

Fetch this section

Send the key in the X-API-Key header. The section can be fetched with the rest of the address, or on its own with pagination.

curl --disable --fail-with-body --silent --show-error --connect-timeout 10 --max-time 30 \
  -H "X-API-Key: ${APPROACH_API_KEY:?APPROACH_API_KEY is not set}" \
  'https://api.approach.no/api/v1/addresses/285717643?include=build_time'

# paginated, one section at a time
curl --disable --fail-with-body --silent --show-error --connect-timeout 10 --max-time 30 \
  -H "X-API-Key: ${APPROACH_API_KEY:?APPROACH_API_KEY is not set}" \
  'https://api.approach.no/api/v1/addresses/285717643/sections/build_time?limit=25'

Why it cannot be tried here

This section is not part of the public demo projection. That is a licensing and privacy decision, not a sign the data is missing: it is served to customers granted the section.