Valuing a condo or apartment looks easier than valuing a house — the units are more alike, there are usually more recent sales to work from, and the floor plans repeat. In practice it hides traps a house valuation never has: floor-level premiums, service charges, reserve funds, lease length and shared amenities that all move price without changing a single square metre. Get those right and per-unit valuation is actually more precise than valuing a detached home; ignore them and you can be tens of thousands out. This guide walks agents, buyers' agents and advisors through valuing a unit from evidence, with a worked example to copy.
The core method is the same as any residential valuation — the sales comparison approach, covered in full in our guide on how to value a house — but the inputs behave differently. A house sits on land that it owns outright, and land is the part of property that appreciates most. A condo or apartment owns a box of air plus a share of the common parts, so its value is driven more by the unit itself and the building around it than by the ground beneath it. That is why units in the same area often grow slower and trade lower per square metre than houses, and why two identical floor plans in different buildings can be worth very different amounts. Value the building and the terms of ownership, not just the rooms.
Start with in-building comparable sales
The single biggest advantage of valuing a unit is that your best comps are often in the same building. A neighbouring apartment with the same layout, sold three months ago, is a far stronger comparable than anything you would ever find for a house. Pull recent sales of similar units in the building first; if there are too few, widen to comparable buildings of similar age, tenure and quality nearby. The general mechanics of sourcing and filtering are in our guide on finding comparable sales, but for units the rule is stricter: same building beats same street, and same street beats same district. Aim for three to six solid, recent comps rather than a long list of loose ones.
The adjustments that matter for units
No two units are identical either, so you still adjust — but the adjustment lines differ from a house. The ones that move value most are:
Floor level. Higher floors often carry a premium for light, view and quiet; a low or ground floor can discount — unless it comes with a private garden or step-free access, which some buyers pay up for. The premium is rarely linear, so measure it from your own building's sales.
Size (living area). Express every comp as a price per square metre or square foot; because units are so alike, this benchmark is unusually reliable here.
Aspect and view. A quiet, bright or view-facing unit beats an identical one facing a wall or a busy road.
Outdoor space and parking. A balcony, terrace or allocated parking space each carry a measurable, market-specific value.
Condition and updates. A renovated kitchen or bathroom adds; dated finishes subtract.
Price the ownership costs, not just the unit
This is the step house valuations skip entirely. A buyer pays for the total cost of owning the unit, so the monthly service charge or homeowners' association (HOA) fee is priced straight into what they will offer. Two identical apartments with very different fees do not sell for the same number. Check four things before you settle on a value: the fee itself and what it covers, the health of the reserve or sinking fund, any pending special assessment for major works, and — for leasehold apartments — the remaining lease length and ground rent. A short lease or a looming assessment can knock a unit well below its comparable-sales figure, and a buyer's lender may flag it too. None of this shows up in the floor area, which is exactly why per-square-metre pricing alone is not enough for units.
Cross-check with per-area pricing and an AVM
Once your adjusted comps cluster, validate the number two ways. First, price per square metre: take the local per-area figure from your in-building comps and apply it to your unit's size — for apartments this is more dependable than for houses because the stock is so uniform. Second, pull an automated valuation as a sanity check, remembering that a model cannot see floor level, aspect or a healthy reserve fund, so it should prompt a recheck, never set the price. Three methods that roughly agree give you a range you can defend. This kind of evidence-led triangulation is the backbone of a proper CMA.
A worked example
Suppose you are valuing a two-bedroom apartment of 70 m² on the fourth floor, with a balcony and one parking space. You assemble three recent comps from the same and neighbouring buildings and adjust each against your unit (figures are illustrative):
Comp A — same building, second floor, 70 m², no balcony, sold for €300,000. Add about €6,000 for your higher floor and €8,000 for the balcony, so adjusted up to €314,000.
Comp B — same building, fifth floor, 72 m², balcony, no parking, sold for €322,000. Subtract about €4,000 for its slightly larger size and add €10,000 for your parking, netting near €318,000.
Comp C — next building, fourth floor, 70 m², balcony and parking, almost identical, sold for €316,000, so it stays near €316,000.
The adjusted comps cluster between €314,000 and €318,000. A per-square- metre check lands near €4,540/m², which for 70 m² implies about €318,000 — inside the cluster. An automated valuation returns €312,000, close enough to confirm. Then you check the ownership costs: the service charge is in line with the building and the reserve fund is healthy, with no special assessment pending, so no discount applies. Your defensible value is roughly €316,000, with a working range of €314,000–€318,000. Had a €15,000 special assessment been looming, you would have priced the unit nearer €301,000 — the same rooms, a very different number.
Rental and investment units: add the income lens
If the unit is bought to let, buyers also weigh the rent it produces, so run the income approach alongside your comps: the yield an investor expects sets a ceiling on what the rent will support. For a unit that is primarily an investment, our guide on valuing a rental property covers the yield and income maths in detail. For an owner-occupier unit, comparable sales still lead and the income view is only context — but in buildings with many rentals, it can explain why prices sit where they do.
Turning the analysis into a client-ready report
The method is sound but fiddly by hand: gathering in-building comps, recording floor and balcony adjustments, normalising to price per square metre, then chasing down service charges and reserve health before formatting it into something a client will actually read. This is the part Biedradar automates. You enter an address and it pulls comparable sales, a valuation and market signals, then generates a branded property analysis report in minutes — the comps, the per-area benchmark and the value range laid out for a seller, buyer or investor to follow. Your judgement on the fees, the lease and the floor premium stays yours; the hours of assembly disappear. Good CMA software is what turns a correct unit valuation into a convincing one, and a clean report defends your price far better than a verbal estimate or a raw spreadsheet.
Common condo valuation mistakes to avoid
Ignoring the service charge. The fee is part of the price; a high one lowers what a buyer will pay.
Missing a special assessment. A pending major-works bill can move value by five figures overnight.
Assuming a fixed premium per floor. Measure it from your building's own paired sales, not a rule of thumb.
Valuing a unit like a house. Land drives house value; the building, tenure and costs drive unit value.
Trusting one online estimate. Models cannot see floor, aspect or reserve health — treat any single AVM as a data point.
Valuing a condo or apartment well is the same disciplined comparison you would run for a house, plus three checks a house never needs: floor and aspect, per-area pricing, and the ownership costs behind the door. Anchor on in-building comps, adjust honestly, normalise to price per square metre, and price the fees and lease alongside the rooms. Do that and you have a number you can stand behind — whether you are winning a listing, advising a buyer or sizing an investment. To go deeper, start with our guides on valuing a house and finding the right comps.
Frequently asked questions
How do you value a condo or apartment?
Value it from recent sales of similar units in the same building or complex first, then widen to comparable buildings nearby. Adjust each comp for floor level, size, view, outdoor space, parking and condition, and normalise everything to a price per square metre or square foot. Because units are far more alike than houses, per-area pricing is more reliable here than for detached homes — but you must still account for service charges, ground rent and any lease length.
Why is a condo worth less than a similar-sized house?
A condo or apartment owns little or no land, shares its structure and grounds, and carries ongoing service charges or homeowners' association fees. Land is the part of property that appreciates most, so units without much of it tend to grow slower and sell for less per square metre than houses in the same area. High or rising service charges, a short lease or a special assessment can widen that gap further.
Do HOA fees or service charges affect a condo's value?
Yes, directly. A buyer prices the monthly service charge or HOA fee as part of the cost of ownership, so two identical units with very different fees will not sell for the same price. Unusually high fees, a pending special assessment or an underfunded reserve fund all reduce what a buyer will pay. Always check the fee, what it covers and the reserve health before finalising a value.
What is the best way to value an apartment?
Use in-building comparable sales as your anchor, express them as price per square metre, and adjust for floor, view, outdoor space and condition. Cross-check against an automated valuation and, for a rental unit, against the income the apartment produces. Three methods that roughly agree give you a defensible range. A single online estimate is a starting point, not an answer, because models cannot see floor level, aspect or building quality.
Does floor level change an apartment's value?
Usually yes. Higher floors often command a premium for light, views and quiet, while ground and lower floors can trade at a discount — though a ground floor with a private garden or step-free access can reverse that in some markets. The premium is not linear, so measure it from your own building's paired sales rather than assuming a fixed percentage per floor.
