Commercial property planning: securing authorisation before the works
3 triggers concentrate commercial property files
17 days of administrative delay equate to 8,000 to 25,000 EUR of rent paid on empty premises: the planning timeline is a budget line, not a formality. Commercial property planning refers to all the administrative authorisations required before any works that modify the external appearance, the use or the floor area of a business premises. Three main regimes structure the matter: prior declaration under 20 m² of created area, building permit beyond that or as soon as a change of use occurs, and ERP works authorisation for premises receiving the public. Processing ranges from 1 month in a standard zone to 5 months within a Bâtiments de France Architect perimeter (timeframes from the Planning Code, articles R.423-23 to R.423-37), including the 2-month third-party appeal period (article R.600-2). Kytom, since 2006, has handled these files in-house, from the initial planning assessment through to the declaration certifying the completion and compliance of the works.
A removable interior partition requires no authorisation. By contrast, three families of works automatically shift the project into a declarative or authorised regime.
- Modification of the external appearance: replacement of joinery, façade renovation, sign installation, shopfront creation, glazed frame on the street side.
- Change of use or sub-use within the meaning of article R. 151-27 of the planning code: shift from office to retail, hotel accommodation, public-facing service, business premises.
- Creation of floor area beyond 5 m² in an urban zone, mezzanine, extension, raising (article R.421-14 of the Planning Code).
An open space reclassified as a showroom open to visitors constitutes a change of sub-use, even without the creation of square metres. The planning assessment is carried out ahead of the programme, on the basis of the municipal PLU, the zone regulations and the updated land registry. A planning assessment carried out too late, after the sketches have been validated, exposes the project to a complete reworking of the plans and to significant programme delays.
When the planning assessment is not warranted: on a strictly interior fit-out project with no modification of external appearance, no change of sub-use and no creation of floor area, the planning feasibility note remains a courtesy deliverable. The budget is better invested in an ERP assessment and in verifying the co-ownership regulations.
For the CFO and the asset manager: planning is a cash-flow item
Contrary to the dominant view in property management, which treats planning as a formality borne by the project management team, the administrative timeline weighs directly on the operating account. For an 800 m² head office in the Paris CBD, the headline monthly rent ranges between 600 and 800 EUR/m²/year, i.e. 40,000 to 53,000 EUR/month of fixed cost during processing.
Three cash-flow lines are at stake on this timeline:
- Rent paid on non-productive premises: every week of authorisation delay equates to 1 week of double rent (former site and new site awaiting fit-out) or rent paid on an empty site.
- Delay in the lease effective date: a building permit processed in 3 months plus 2 months of third-party appeal postpones the negotiated rent-free period by at least 5 months.
- OPEX vs CAPEX: a poorly framed ERP file imposes mid-works reworking of fire-resistant partitioning costed at 80 to 150 EUR/m², i.e. a non-capitalisable budget overrun.
Our reading differs from common practice in asset management: the planning assessment should appear as an annex to the LOI, not as a prerequisite of the DCE. Across our portfolio, the files that settled the authorisation regime before lease signature consistently show better adherence to the announced timeline.
Professional limit: on a lease renewal in premises already operated as-is, with no change of use or façade, the upstream planning arbitration has no effect on cash-flow. The prior assessment then falls under governance comfort, not financial coverage.
Prior declaration or building permit: 2 arbitration criteria
The arbitration rests on 2 cross-referenced criteria: nature of the works and floor area created. The 20 m² threshold is assessed cumulatively over the last five years, not project by project (article R.421-14 of the Planning Code), which traps head offices that have undergone several successive works campaigns.
| Regime | Trigger threshold | Typical works | Processing standard zone |
|---|---|---|---|
| Prior declaration | < 20 m² created area | Modification of external appearance, façade renovation in protected sector, sign | 1 month |
| Building permit | > 20 m² or change of use | Extension > 40 m², structural or façade intervention | 2 to 3 months |
| ABF perimeter | all visible works | Binding opinion from the Bâtiments de France Architect required | + 2 months |
The processing times are drawn from articles R.423-23 to R.423-37 of the Planning Code. The prior assessment is conducted with supporting documents: PLU extract, zone regulations, land registry plan, possible remarkable heritage site regulations. This documentary analysis sets the nature of the file before any design.
Arbitration limit: on a project under the 20 m² threshold outside a protected zone and with no modification of external appearance, the prior declaration brings no additional security if the town hall confirms in writing that no authorisation is required (operational planning certificate). Filing a precautionary DP extends the timeline by 6 weeks.
Prior ABF consultation: up to 6 months saved
The Bâtiments de France Architect does not validate a project, they prescribe adjustments. A prior consultation, conducted in a physical meeting before filing, avoids a complete reprocessing of a file in a remarkable heritage site. Our experience on files within the ABF perimeter shows that a prior meeting with the Bâtiments de France Architect significantly reduces the risk of an unfavourable opinion.
Kytom presents the project, adjusts joinery profiles, RAL façade colours, shopfront layout and material choices according to local requirements. Three adjustment levers recur in 90% of ABF files:
- Joinery profile: section, partition, colour, clear or heritage laminated glazing.
- Sign and external signage: capped dimensions, non-backlit lettering, reversible fixing.
- Visible air conditioning and ventilation: grilles, condensers, roof outlets integrated into the building volume.
The exchanges are recorded in a report sent to the project owner. The filed file reflects the ABF prescriptions, which brings the processing time down to the regulatory minimum within a historic monument perimeter.
When the prior consultation is not relevant: for works strictly invisible from the public space within an ABF perimeter (interior fit-out with no intervention on façade or roofing), the prior meeting brings no processing value. The file can be filed directly.
Frequently asked questions
What timeframe should be planned between filing the planning file and starting the works?
Allow roughly 1 month of processing for a prior declaration in standard zones, and 2 to 3 months for a building permit, plus a 2-month third-party appeal period (Article R.600-2 of the Planning Code). Within an ABF perimeter, add 2 further months for the binding opinion of the Architect of the Buildings of France. A pre-filing ABF consultation reduces the risk of a repeated review.
