Valuing a basement or cellar as commercial space in Morocco

Two questions decide the value of a basement, in this order: what may lawfully happen in it, and how usable it actually is. The price per square metre comes third, and only once the first two have been answered.

1. Why the ground-floor rate never carries downstairs

On a ground-floor retail unit, value concentrates in the first few metres: frontage width, display window, visibility from the street, passing trade. A basement has none of those attributes. This is why the exercise is conducted not on gross area but on weighted area: the shopfront zone carries the highest coefficient, depth and back-of-house a declining one, and the basement or mezzanine a lower one still, according to how accessible and how usable they really are.

In practice the below-ground square metre carries a discount against a reference square metre at street level. That discount is not a fixed number taken from a scale: it is the sum of factors observed on site, each documented and tested against sales of comparable spaces — the logic of justification set out in our note on discounts and abatements in valuation. Measuring the areas correctly in the first place is a related discipline, covered in our article on floor area and price per square metre in Morocco.

2. The four physical factors

Four parameters degrade the value of a below-ground area, separately or cumulatively. The valuer assesses them at the inspection, costs them, then tests the result against comparables. The more they accumulate, the heavier the discount.

• Access. This is the dominant criterion. A basement connected directly to the shop above by a private staircase or a goods lift keeps genuine operational utility — as a store, a workroom or additional trading space. A basement reachable only through the common parts, or by an unappealing separate entrance, loses most of its operational value.
• Usable headroom. Low headroom rules out certain uses — receiving the public, high stacking, plant — and weighs heavily on appeal. The valuer measures the real height, net of beams, ducts and exposed services.
• Ventilation and lighting. No natural light, insufficient ventilation, no windows or light wells: all of these limit the use and raise running costs. A windowless basement does not receive the public on the same terms as a unit at street level.
• Damp and waterproofing. Below-ground areas are exposed to rising damp and to water ingress. Signs of damp, failing tanking, or a risk to stored goods justify a discount for depreciation or for the cost of putting the space right, on reinstatement-cost logic.

3. The precondition that changes everything: is the use permitted?

Before any discussion of discount, one question governs the whole value: is commercial use permitted in the basement at all? As with a unit at street level, the use must be authorised at two levels:

• The condominium bylaws. Many basements are designated there for parking, storage or plant. The bylaws may restrict or prohibit an activity receiving the public, as they do for noisy or nuisance activities. Any change to the designated use of a lot falls under the rules of Law 18-00 on condominium ownership, and a change of use of a lot is not something that can be improvised.
• The permit and planning consent. The building consent fixes the designated use of each level. A basement designed and consented as parking or as a store is not intended to house a commercial activity; operating it that way may be non-compliant, with a regulatory exposure attached.

The consequence for value is direct: a basement whose commercial operation is not permitted is not valued as a shop. Confusing use in fact — what is being done there today — with use as permitted — what is lawfully allowed — is the principal source of overvaluation on this type of asset, and the one a buyer purchasing from a distance is least equipped to detect.

4. Reclassification: when the cellar is only an ancillary

Where commercial use is not permitted, where access is only through the main lot, or where the area is not separately identified on the land title, the valuer cannot treat it as a stand-alone commercial unit. It is reclassified as an ancillary of the lot — a store, a cellar, a reserve — attached to the shop or the flat, contributing a reduced amount of value.

The distinction is the same one we draw for parking spaces and garages in a condominium: everything turns on the legal nature of the space.

• A self-contained condominium lot — an area with its own share of the common parts and its own identification on the land title. In principle it can be valued and sold separately, subject to the permitted use.
• A common part with exclusive enjoyment, or an ancillary attached to the main lot: it follows the lot and is generally not disposable on its own. Its value is a contribution to the lot, not a stand-alone market value.
• An area not separately identified on the land title: treating it as a shop that can be sold separately is legally fragile. Prudence requires reclassification as an ancillary until the position has been regularised.

5. Which basis of value to apply

Once the space has been qualified and the permitted use verified, two approaches combine, following the logic of direct comparison under RICS standards:

• Direct comparison. The property is set against recent sales of below-ground space with a similar profile — access, headroom, condition — in the same building or the same sector, after weighting. This is the reference approach wherever comparables exist.
• Income capitalisation. Where the basement is let, or held as an investment, the net market rent is converted into value at a yield. This approach is the right one for space let to an operator, or used as an income-producing store.

Where the area has been reclassified as an ancillary, the valuer folds it into the main lot as a component rather than treating it as a separate asset — a store attached to a shop adds value to the shop without being worth the price of a unit in its own right. The choice of basis and the reasoning behind it belong in the report; the bases themselves are set out in our note on the Red Book bases of value.

6. Three reflexes before buying or valuing

• Never carry down the ground-floor rate. Below-ground area is weighted and discounted; an “average” rate per square metre for the building means nothing for a basement.
• Establish the permitted use before the value. The condominium bylaws and the planning consent come first: a basement operated “as a shop” without authorisation is worth what an ancillary is worth, not what a unit is worth.
• Qualify the right on the land title. Self-contained lot, exclusive enjoyment of a common part, or an ancillary with no separate identification: that qualification governs both the method and whether the space can ever be sold separately.

On this class of asset the gap between an intuitive figure and an independent report prepared to RICS standards is frequently material, in either direction. The report qualifies the space first, verifies the use, then documents the discount by comparison and, where relevant, by capitalisation — a conclusion that is documented and verifiable line by line rather than asserted.

7. Instructing the work

Our reports are prepared by RICS-certified experts and comply with Red Book standards: site visit, measured areas, qualification of the space, examination of the permitted use, and comparables set out with the adjustments applied to each. Fees start at 3,500 MAD excl. tax, with a firm quote within 24 hours and delivery in 5 to 8 days, 48-72 hours on the express service. ReaConsult has been advising owners and investors since 2019, with more than 5,000 valuations completed, offices in 6 cities and a rating of 4.9/5 across 47 reviews. A private valuation informs a decision and an arm's-length negotiation.

Note:this article sets out a valuation methodology. Weighting coefficients and discounts are specific to each property and are documented by comparison; there is no universal scale, and no percentage is quoted here. The permitted use of below-ground space depends on the condominium bylaws and the planning consent — confirm your own position with your managing agent, your notary and the competent planning department. A private valuation informs a decision and an arm's-length negotiation. To instruct us, see our contact page or the property blog.