Charging a Percentage of What the Building Ends Up Costing

Pricing Work Nobody Has Scoped

An owner asks an architect to design a building. At that point no one knows how big it will be how complex how many design iterations the owner will need or how long approvals will take

Pricing that work is really difficult and the profession has long settled on a convention: fees are a construction cost percentage commonly ranging from a few percent for simple repetitive buildings to well over ten percent for complex or highly customized buildings

The logic is that design effort correlates with project size and complexity and construction cost is a reasonable indicator of both

There is something slightly strange about that convention that is worth mentioning at the beginning. The fee is set as a portion of an amount that does not yet exist and will not exist until the work being priced has already been performed. The designer is paid a percentage of the result he is in the process of determining which is an unusual arrangement in any professional market

The Incentive Problem

The correlation is real and the incentive is the other way around

A designer who is paid a percentage of the construction cost earns more with an expensive building than with a cheap one. Specifying a more expensive material a more complex structure or a more elaborate system increases the fee

In contrast a designer who finds a substantially cheaper way to achieve the owner's goal has reduced his or her own compensation

How Large the Distortion Actually Is

The incentive works in the wrong way and is worth measuring rather than simply deploring because its size changes what the owner should do about it

None of the following is a real project. Treat the percentages as illustrative and round

Take for example a designer with a single-digit percentage rate who specifies a more expensive façade. Whatever additional cost that decision adds to the building the designer captures only his percentage of it. The owner pays it all. Thus the designer earns a small portion while the owner absorbs the entire increase

Run the same arithmetic in the other direction. A designer who does the harder work of finding a cheaper way to achieve the same goal gives up the same small portion and gives the owner all the savings

Two things follow that point in different directions

The misalignment is genuine as the designer is worse off for saving the homeowner money and that's a bad asset for any fee structure

The pull is also weak. A small percentage of an increase is not a large enough premium to force a competent professional to specify something he or she does not believe in particularly given the reputational cost of being known as expensive and the business cost of not being asked for again

Putting them together the realistic failure mode is not a designer who covers a building with gold to inflate a fee. It's a designer who simply does not spend unpaid effort seeking savings because that effort is really hard is not fully compensated and actively reduces fees. The distortion manifests itself as an absence of cost discipline rather than a presence of extravagance which matters because those two problems have different solutions

Why It Survives

Three reasons and they are practical

It can be agreed early. An owner and a designer can shake hands on a percentage before anyone knows what the project is which is precisely when the appointment must be made

It scales automatically. If the owner substantially expands the writing the rate is adjusted without renegotiation avoiding a series of discussions about variations

It is the convention of the market. Rate benchmarks exist by building type owners expect it and deviating from convention requires justification on both sides

The second reason deserves more credit than it usually gets. Owners change their minds and on a long project they do so repeatedly. A fee base that absorbs scope growth without negotiation each time eliminates a permanent source of friction between two parties who need to continue working together for years. Each alternative structure turns each of those changes into a business discussion

Why the Least Distorted Option Is Rarely Used

Look again at the fourth row of the table because it raises an obvious question. Cost per unit area is the only basis that does not reward expensive specifications. A designer who pays per square foot gains nothing from a more expensive façade. If the specification incentive is the problem that row seems to solve it

It's not standard and the reason is that it breaks what made the percentage defensible in the first place

The percentage works as an indicator because the cost of construction follows both size and complexity. Size of area tracks only. Two buildings of identical square footage can require wildly different amounts of design work: a repetitive shed and a hospital of the same size are not even remotely the same brief. Paying per square meter the easy and difficult prices are identical which means that the designer of anything complex is underpaid and will reject the work or will be short on resources

It also trades one distortion for a worse one. Rewarding larger buildings is more dangerous than rewarding expensive ones because area drives construction costs more powerfully than specifications. A fee base that quietly encourages construction of a larger building has more influence on the owner's total spending than one that encourages a nicer one

And it offers no practical benefit either. The area is almost as unknown as the cost when the appointment is signed so the problem of the initial agreement remains unresolved

How the Distortion Is Managed

Incentive-aware owners use several correctives

Limit the rate to a construction cost estimate so that increases above the estimate do not increase the rate. This eliminates the incentive to specify upward and creates a new one since the designer now bears the cost of any scope increases requested by the owner

Cost targets written in the appointment the designer being obliged to redesign on his own if the project exceeds them. This is common and is negotiated a lot since the designer does not control the bidding markets

value engineering exercises conducted with the contractor which present a party whose interest is cost reduction and provide independent control of specifications

Incentive rates linked to delivering below a target cost which reverses distortion directly and are rare because they require an agreed basis that no one trusts

Why the Correctives Are Hard to Write

Each of these correctives is sensible and they all run into the same obstacle which is that the designer becomes responsible for a number that he only partially controls

A construction cost is produced by a design and by a market. Design is the designer's job. The market is not. Material prices vary labor availability is reduced and contractors' appetite for a particular job depends on how full their backlog is when the bid comes in. A project can exceed its cost target without a single line of the design having changed simply because the bid came to a different market than anticipated

One redesign obligation that triggers that outcome is asking the designer to work for free because of a price movement he did not cause and could not cover. That is why these clauses are extensively negotiated rather than accepted and why negotiation focuses primarily on exceptions: what counts as a market movement how the baseline is indexed what estimate governs and what happens when the owner's own changes are part of the overage

The same problem lurks behind incentive fees. Paying a designer for falling short of the target requires everyone to agree on what the target was and a baseline established before the design exists is an assumption that the party being compared to it had a hand in setting it. That's precisely the basis that no one trusts and that's why the cleanest solution to the incentive problem is also the least used

Value engineering avoids all the difficulty by a different route. Instead of trying to include the incentive in the designer's fee hire a contractor whose business interest already points to a cost reduction. The check comes from a party with an actual stake and not from a clause

The Phasing Structure

Fees are generally paid in defined stages with a percentage of the total allocated to each: conceptual design developed design technical design bidding and construction administration

The allocation is important from a business point of view because a project canceled at the concept stage should pay only the concept portion. Owners negotiate for the allocation to be weighted toward later stages and for designers to be weighted toward earlier stages exactly for that reason

Construction management that is the role of the designer during construction is often underestimated in relation to the effort it consumes because it is the residue after the design stages have been negotiated and because its duration depends on how well the construction goes

That last point contains a bit of a trap. The stage whose cost depends most on things going wrong is the stage whose price is set last and with the least care. A build that lasts a long time eats up the designer's time month after month versus a rate set when everyone was optimistic which is why this stage is where appointments most often become unprofitable

The Liability Asymmetry

One feature that distinguishes design fees from other professional fees is the relationship between fees and exposure

A design fee on a large project could represent a small percentage of the construction cost. A design error can result in remediation costs that represent a substantial fraction of the entire project

The exposure is therefore many multiples of the fee which is why professional indemnity insurance is mandatory in practice why limits of liability are hard negotiated and why designers resist guarantees that guarantee results rather than promising reasonable skill and care

An owner who insists on a fitness for purpose obligation often finds that professional indemnity policies exclude it meaning the warranty is only as good as the balance sheet of a business that may be small

Skill and Care Versus Fitness for Purpose

That distinction decides who is at risk when a building goes down and it pays to be precise about that

a reasonable skill and care The obligation is a process standard. It asks whether the designer behaved as a competent member of the profession would have done. A designer who followed accepted practice used the standards in force at the time and made justifiable judgments has complied even if the building later turns out to underperform

a fitness for purpose Obligation is a standard of outcome. It asks whether the thing works as promised. The care the designer took is not a defense

The commercial consequence is derived from what the insurance covers. Professional compensation responds to negligence that is failure to comply with the procedural standard. In general it does not respond to a guarantee of result because it is a contractual promise rather than a professional failure and insurers refuse to subscribe to the promises that their insured decided to make

Therefore an owner who negotiates hard and obtains a fitness for purpose guarantee has obtained a stronger obligation backed by a weaker guarantee. The promise of skill and attention is modest and supports an insurance policy

Therefore winning that clause can leave an owner worse protected than losing it which is a good example of a negotiating victory that must be compared with what is really behind it

The Bottom Line

Construction cost percentage fees exist because the design must be commissioned before anyone knows what is being designed and no better mechanism has displaced them despite the obvious problem that they reward expensive specifications. Owners manage it through caps cost targets and independent value engineering rather than through a different fee base as each alternative distorts in a different direction. The structural feature worth understanding is that the fee is small and the liability is not which explains themost of what appears in the contract. It also explains why the arguments focus where they do: on a fee compared to a number that the designer does not fully control and on an exhibition that no fee on this scale could ever finance