Often in a multi story building, the OC determines
(a) how often to recarpet a common area (say every 6 yrs);
(b) How much money per floor to allow for said recarpeting; and
(c) What colour/style the carpet should be in order to be uniform in the building.
If say the OC allows $2,00o per floor, in your case it’s $1,000 per lot every 6 years, then so long as each floor is given such an allowance every say 6 years (adjusted for inflation), it doesn’t matter if one floor changes carpet today and another floor does it next year etc. Records will be kept of when a floor replaced a carpet. If owners of a floor want say a $3,000 carpet then they will have to top up the $2,000 allowance given to that floor.
The OC should stipulate that only well known carpet suppliers & layers can be used. Using such a commercial firm will ensure correct underlay is used and good quality workmanship will be provided.