A square foot estimator prices the house next door.

Why the estimator is the whole argument

Replacement cost estimating software breaks a house into components and prices each one. It's good software, and it's accurate on most houses, because most houses are assembled from parts a lot of builders install a lot of times, at prices a lot of suppliers publish.

The accuracy comes from repetition. When the tool prices a kitchen at the high finish tier, it's pricing the most expensive kitchen that still shows up often enough in the data to have a reliable price. Yours didn't come from a tier. It came from a run of one-off decisions. Cabinetry built by a named shop to a drawing, a slab chosen off a particular block, hardware the architect specified rather than picked from a catalog.

The same thing runs through the whole house. A curved staircase, steel windows, a timber frame with exposed joinery. The estimator prices the nearest thing it knows, and the nearest thing it knows is cheaper. The software is doing what it was built to do. You asked an average about something that isn't average.

The fix is a documented estimate built from your actual house. The plans, the specification, the finish schedule, and where you can get it, the original builder's cost breakdown. On a recently built home that paperwork still exists, and it's the most useful thing you can hand an underwriter.

Reconstruction cost is not market value

People mix these two up constantly, and on custom construction it costs money in both directions.

Market value is what a buyer would pay. It contains the land, the view, the school district, the street and whatever the market is doing that year. Reconstruction cost carries none of that. It's what a builder would charge to put the structure back on a lot that already has a foundation hole and a burned slab, at today's labor and material prices, with the finishes the house actually had.

On a waterfront lot where the land carries most of the value, reconstruction cost can sit well below the sale price. Insure to market value there and you're paying for coverage you'll never use. On a heavily customized house on an ordinary lot it runs the other way, because the market won't pay a buyer back for your choices, and a rebuild still has to make every one of them again.

Neither one is unusual. Both are worth checking instead of assuming, and a rate applied to square footage won't settle either. We don't publish a per square foot figure for any market we serve, because no credible construction cost research organization publishes one for custom residential work in these markets. Anyone quoting you one is quoting a guess with a decimal point on it.

Professional fees: the architect and the engineer

You can't rebuild a custom home from a memory of it. Somebody has to draw it again. On a total loss that means an architect. Depending on the structure it also means a structural engineer, a geotechnical report, a civil engineer for the site work, and maybe a lighting or acoustic consultant if the original had them.

That's real money, and it lands before a single board gets cut. Some policy forms treat professional fees as part of the cost to repair or replace. Some address them in a specific provision, often with a cap. Some say nothing at all, which is its own answer.

The question is narrow. Does your form pay for the redesign, and if so, up to what. Worth checking on any architect designed house. It's easy to establish now and impossible to negotiate later. Confirm it against the policy as issued.

Matching, and the partial loss problem

Most losses aren't total. A tree comes through one corner of the roof, a pipe fails above a hallway, a fire stays in one room. On an ordinary house those are straightforward, because you can buy the roof tile, the flooring and the siding again.

On a custom home, often you can't. The stone came from a quarry run that's finished, the tile was a discontinued line, the flooring was reclaimed timber from one source, and the windows came from a shop that has closed. The repair itself is easy. What you end up with is a house with one elevation that doesn't match the other three.

Policy language on this varies more than almost anything else in the form. Some carriers address matching of undamaged portions directly and pay to bring the surrounding area into line. Some address it for specific components only, such as roof surfacing. Some leave it to a general standard of like kind and quality, which is where the arguments start.

Read it before a loss rather than after. On a house with an unusual exterior material it can be the most important clause in the document, and it almost never shows up on the declarations page.

Ordinance or law on a house that already exceeded the code

Building codes change. A rebuild has to meet the code in force when the permit is pulled, not the one in force when the original went up. Ordinance or law coverage is the part of the policy that pays for the code driven work rather than for putting back what burned. It funds the demolition of undamaged portions the code won't let you keep, the increased cost of construction to bring the structure current, and in some forms the value of the undamaged parts that have to come down.

People with custom homes sometimes assume this isn't their problem, since the house was built above code to begin with. That holds for structural performance and often doesn't hold for anything else. Energy codes, seismic provisions, sprinkler requirements, wildland urban interface material standards and stormwater rules all move. A house built to an excellent standard in one decade can still trigger a long list of upgrades in the next.

Ordinance or law is usually a stated amount or a percentage of the dwelling limit. On a large custom home, a percentage that sounds generous can be small against the actual work. Check the amount against the age of the structure and the jurisdiction. If your city or county adopted wildland urban interface material standards after the house was built, raise that one specifically.

Landscape, hardscape and outbuildings

On a custom property the ground is often part of the design. Retaining walls, terraces, a pool and its equipment room, an entry drive with a defined surface, irrigation, mature specimen planting, a pool house, a shop, a detached garage with a studio above it, a barn, a well house, fencing and gates.

A standard homeowners form covers other structures as a percentage of the dwelling limit, often ten percent, and covers trees and shrubs with a small sublimit and a short list of named perils. On an ordinary property that arithmetic works. Where the hardscape alone is a serious construction project, it may not.

Two things worth doing. Count what's actually out there and price it, instead of trusting the default percentage. Then check whether any of it should be scheduled, meaning listed and valued item by item, rather than left inside one blanket limit. That depends on the form. Detached structures with utilities run to them and finished interiors often earn their own line.

Loss of use over a long rebuild

Custom homes take longer to rebuild than ordinary ones, and the reasons compound. The design has to be redrawn and re-permitted. The trades who can do the work are fewer and busier. Materials are ordered rather than picked up. After a regional catastrophe, every one of those constraints gets worse at once, because every owner in the affected area is competing for the same drawings, the same permits and the same crews.

Loss of use, sometimes called additional living expense, pays for somewhere comparable to live while that happens. Two parts of it matter. The amount, which is either a percentage of the dwelling limit or a stated sum. And the time limit, which may be twelve months, twenty four months, or the reasonable time required to repair or replace with no stated cap.

The time cap is the one that bites. A twelve month limit on a house that realistically takes three years to rebuild is a gap you won't notice until it's the only thing that matters. Forms written for expensive homes often handle this better, though it varies, so confirm it against your own policy.

The inspection

On a custom home an inspection is common and on some programs it is a condition of the offer. An appraiser walks the house inside and out, photographs finishes, measures, notes the systems, the roof, the protective devices and the site.

People read that as an obstacle. Usually it works the other way. An inspection is how your house stops being a row in a database and becomes a specific building with specific materials. It's what gets the insured value right, and it often produces a number you wouldn't have argued for yourself.

It can also produce conditions. A recommendation to add a monitored water shutoff, update a panel, replace a roof covering or clear vegetation is normal. Treat those as information about the house rather than as an insult to it.

Carrier fit

Not every company is set up for this. A few things separate them. Whether a company will use a reconstruction estimate built from your plans instead of insisting on its own estimator output. Whether it offers extended or guaranteed replacement cost, and on what conditions. How its form handles matching and professional fees. Whether it inspects. And how it runs a claim when the answer is a specialist trade rather than a name off a preferred contractor list.

Availability and eligibility vary by carrier, by form and by state, and get decided in underwriting. We'll tell you which companies fit the house and what paperwork changes the answer. Nobody can promise acceptance, and a promise of acceptance is a warning sign.

If this has already been hard, through a non-renewal, an inspection with conditions attached or a wildfire related decline, that's a normal place to start from.

Where this connects to the rest of the household

A custom home is usually the biggest single piece of a wider picture. If there's a second or seasonal residence, somebody needs to read the occupancy conditions and how the contents are split between them. If the house is older or architecturally unique rather than newly built, the valuation problem changes shape and restoration becomes the central question. If it sits on acreage, fire protection and water supply drive both eligibility and price.

The umbrella sits over all of it, and the underlying limits on every policy it attaches to have to be checked rather than assumed. Start at the private client overview, or look at high value home insurance for the foundation this is built on.

If a renovation is underway or planned, read remodeling a home first. That's where the existing policy most often stops fitting, and it's easier to handle before the permit than after the framing.

Reviewed for insurance accuracy by Richard Sweet, owner of Vantage Point Risk and an independent insurance advisor. Last reviewed September 26, 2026. How we review this.