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estimate of the cost is registered before the work has begun. If, however, the cost of the work exceeds the provisional estimate, there is no preferential right for the excess.

The increase of value of an immovable arising from the work done upon it, is to be estimated by experts appointed by the court, and at the time of the intervention in the distribution.

339.

A preferential right registered in accordance with the provisions of the preceding two articles can be exercised in preference to a mortgage.

340.

A preferential right on account of the sale of an immovable retains its effect, if at the time when the contract of sale is made, the fact that the price or the interest thereon has not been paid is registered.

341.

As to the effect of a preferential right, in addition to the provisions of this Section the provisions as to mortgages apply correspondingly.