A weak set of comparable sales, deferred maintenance, unpermitted or unfinished work, rooms that do not meet the definition of what they are called, and improvements the street will not pay for are what actually pull a value down; clutter, decor and paint color do not.
Almost everything people worry about before an appraisal is cosmetic, and almost everything that moves the number is structural, documentary or about the neighborhood rather than the house. The appraiser is answering one question, what would this sell for, so only the things a buyer would pay differently for count.
The comparable sales do most of the damage
A value is built from closed sales, so the state of those sales sets the ceiling before the appraiser walks in. Where prices have softened over recent months, the closings on the books are older and higher than the market and the appraiser adjusts downward for time. Where the recent sales nearby were short sales, foreclosures or investor purchases, they pull the range down even though they were never comparable in condition.
A home with no real peers has the same problem from the other direction: the only two-story on a street of single-story ranches, or the only acre lot in a subdivision of quarter-acres, gets valued from worse matches than a typical house does. None of that is fixable by the seller, which is the thing worth knowing before an appraisal is treated as a verdict on the house.
Maintenance, permits, and rooms that do not count
Condition moves value directly. A roof at the end of its life, a failed air conditioning unit, water stains, cracked stucco, a water heater that does not work and visible settlement all push the condition rating down and the value with it, and several of them become required repairs on an FHA or VA appraisal before any loan can close.
Permits are the quieter problem. Finished square footage the county has no record of is generally not counted in gross living area, so a $60,000 addition can contribute nothing to the appraised value and still cost something if the work looks amateur. The same goes for a converted garage, an enclosed patio and a casita nobody filed for.
Rooms have definitions. A bedroom needs a way out in an emergency, which in practice means a window of a certain size, and a room without one is not counted as a bedroom whatever the listing says. A house marketed as four bedrooms that appraises as three loses value at the comparison stage, because the sales it is being measured against were four-bedroom houses.
Over-improvement, and the Las Vegas version of it
An appraisal is bounded by its neighborhood. A kitchen that would suit a $900,000 house does not make a $500,000 house worth $700,000; it makes it the best house on the street, and the adjusted comparable sales still land near the top of the range rather than above it. Improvements return part of their cost, and the part shrinks the further the improvement gets from what the street already has.
Here the clearest example is the pool. A pool in the valley costs $50,000 and up to build and typically adds a fraction of that, because so many nearby sales already have one that a pool reads as normal rather than as a premium. The reverse happens too: a house without a pool in a subdivision where every recent sale had one is the one being adjusted downward. Casitas and converted garages behave the same way, permitted and typical adding value, unpermitted or unusual adding argument.
What does not hurt it, and what to do about a number that did
Furniture, clutter, dishes in the sink, paint color, dated but working fixtures, a pet in the house and the state of the landscaping are not value. What registers in the photographs is damage, unfinished work and missing things, not untidiness.
When the number looks wrong, the route is a reconsideration of value: a written request through the lender identifying specific closed sales the report did not use, or a factual error in the square footage, the room count or the condition rating. Since late 2024 lenders have had to disclose that a borrower may request one and how, and each appraisal gets one. It succeeds on better evidence and never on disagreement, and where it fails the gap goes back to being a negotiation between the buyer and the seller.
Questions people ask
Do unpermitted additions hurt an appraisal?
They can, in two ways: the finished area usually cannot be counted in gross living area, and work that looks incomplete or amateur pulls the condition rating down. Permitted, finished and consistent with the rest of the house, an addition contributes normally.
Does a bad roof stop a loan?
On an FHA or VA appraisal it can. Those programs require a roof with reasonable remaining life and no active leaks, and the appraiser writes it as a repair to be completed and verified before closing. A conventional lender may accept the same roof at a lower value instead.
Can the owner be there for the appraisal?
The owner or their agent usually is, and handing over a list of permitted improvements with dates, plus recent closed sales nearby, is normal and useful. Telling the appraiser what number the deal needs is not, and it undermines everything else handed over.