Job costing, AIA billing and WIP built for lab and cleanroom fit-out
Construction accounting in Cambridge has to survive a lab fit-out. A Kendall Square build costs several times what an office shell of the same size costs, most of it mechanical and electrical, with air handlers and lab equipment ordered a year out and paid for long before they arrive. Then the research program changes and the change orders start. Meanwhile the owner wants AIA G702 and G703 billing with documentation behind every line, and retainage sits until commissioning finally signs off. We keep job costing, billing and the WIP schedule as one system so cash is never a guess.
On the ground
The MIT campus, Cambridge, Massachusetts
On a Cambridge laboratory fit-out the shell is the cheap part. Air handling, exhaust, process piping, gases, controls, emergency power and specialty equipment carry the budget and the risk, and they are installed in a sequence dictated by shutdowns and vibration windows rather than by floor. Cost codes copied from a commercial office job will not tell you which system or which phase is losing money until the job is over.
Every construction platform claims to have a "QuickBooks integration." Most break the moment your books need to be accurate. Sales tax mismaps, retainage disappears, change orders create duplicates, and job costing reports stop matching project reality. We fix the integration so your software, your books, and your job‑level numbers all tell the same story.
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Institutional owners and venture-funded tenants both bill the same way and both audit the backup. A payment application that arrives without the lien waivers, the stored materials proof or the schedule of values reconciled to the change order log does not get paid late, it gets returned. Our construction bookkeeping keeps the underlying records in the shape the application needs.
Research requirements move faster than construction documents. A new principal investigator, a different instrument, a revised containment level or an extra headcount rewrites the mechanical design after the budget is fixed, and on construction manager and design build work the field keeps building while the paperwork catches up. Unpriced work that nobody is counting is the single most common way a Cambridge fit-out loses its margin.
Long lead procurement makes a lab job look profitable early and hurt later, because cost incurred on deposits runs ahead of anything you can bill. A monthly work in progress schedule is the only thing that shows the truth. We compare cost to date against a reviewed estimate to complete, calculate earned revenue on percentage of completion, and show over and underbilling job by job.
Cambridge is one of the most expensive places in the country to carry a job, and the working capital tied up in equipment deposits and retainage decides what you can take on next. Our construction tax planning, controller services and outsourced CFO support answer what a contract does to cash before it pays, and whether the exemptions you are entitled to are actually being claimed.
They didn’t just record transactions and call it a day. They built a custom chart of accounts around how a remodeling company actually runs, did a full catch-up on years of bookkeeping inside QuickBooks Online, and now stay on top of my monthly bookkeeping and payroll. Every step, they broke it down in simple terms instead of burying me in accountant talk.
FinTruction rebuilt the whole thing from the ground up, with real job costing, work in progress, and retainage. They didn’t just hand me reports and disappear; they walked me through my numbers until I understood them.
Sahil and his team handle the bookkeeping and job costing for my painting business. They cleaned up my books and set up integrations that give me accurate, timely job costing with solid weekly data. Reliable, detailed, and genuinely invested in getting the numbers right.
FinTruction is the only bookkeeping team we’ve found that truly understands construction accounting and WIP reporting. They aligned our income and costs across 21 jobs and gave us full, monthly transparency. Fast, accurate, and an indispensable partner.
When I came to FinTruction I had no financial structure. No job costing, no WIP tracking, books behind. They did a full cleanup and rebuilt job costing and WIP tracking in QuickBooks. Now I know what’s billed, what’s owed, and where every job stands.
A couple of minutes from a contractor we support, sharing what working with FinTruction has been like and what changed once their numbers finally made sense.
Cambridge is a laboratory market before it is anything else. Kendall Square holds the densest concentration of biotech and pharmaceutical tenants in the world, and the construction that follows is overwhelmingly interior: lab and vivarium fit-out, cleanrooms, pilot manufacturing suites, and the conversion of older office and industrial floors into research space. East Cambridge, Cambridge Crossing at the old NorthPoint rail yards, and the Alewife quadrangle carry the same work at different stages of build-out, while Central Square, Harvard Square and Porter mix institutional, retail and residential renovation into the same few square miles.
The accounting consequence is that Cambridge contractors are financiers as much as builders. Air handlers, exhaust fans, chillers, switchgear, generators, fume hoods, cold rooms and biosafety cabinets all carry long procurement lead times, and vendors want deposits and progress payments long before delivery. That cash goes out while your billable percentage of completion is still low. If the deposit is booked as an expense instead of a tracked commitment against stored materials, the job cost report shows a loss that is not real and the pay application misses the one line that would have brought the money back.
Owners here are unusually demanding on documentation, and they are demanding in two different directions. Universities, teaching hospitals and the City of Cambridge run formal AIA G702 and G703 processes with lien waivers, certified backup and slow institutional approval cycles. Venture-funded biotech tenants move faster but carry a different risk, because the fit-out is being paid out of a financing round and a landlord improvement allowance, and neither is unlimited. Knowing which of your receivables sits behind an endowment and which sits behind a runway is a real credit question, not a paperwork one.
Then there is the site itself. Cambridge blocks are narrow, laydown space barely exists, deliveries get pushed to nights and weekends, and much of the work happens in buildings that stay occupied throughout, which means shutdown windows, vibration and noise restrictions, and crews returning to finish what they could not reach. Those conditions are ordinary here and they are also where the base bid quietly runs out. We tag that premium labor to the job that caused it. You can see how we have handled similar work in our construction accounting case studies, and contractors running Procore alongside QuickBooks usually find the fix starts there.
Cambridge is the densest life sciences market in the world, and a laboratory tenant fit-out behaves nothing like a commercial build. The money sits in the trades, the cash leaves before the work starts, and the scope moves while you are building it.
Prevailing Wage, and Where It Does Not Apply: The Massachusetts prevailing wage law in M.G.L. Chapter 149, sections 26 through 27, applies to construction awarded by a public body, and the Department of Labor Standards issues a wage schedule for the individual project with certified payroll records due weekly to the awarding authority. City of Cambridge building, school and infrastructure contracts fall inside it. Privately funded university, biotech tenant and developer work generally does not. The exposure is a contractor running both kinds of job through one payroll and treating them identically, which is how a wage schedule gets discovered after the work is built.
Buying Materials Exempt on Institutional Work: Massachusetts treats a contractor as the consumer of materials installed into real property, so the 6.25 percent sales tax is normally paid on purchase. On a project for a governmental body or an IRC Section 501(c)(3) exempt organization, which is most Cambridge university, hospital and municipal construction, the contractor may purchase exempt using Form ST-5C, the Contractor Sales Tax Exempt Purchase Certificate, supported by the owner Form ST-2 under M.G.L. Chapter 64H, section 6. The exemption extends to equipment rented for use on the exempt site. It must be claimed at the point of purchase, which means the purchasing process, not the tax return, is where the money is won or lost.
The Research and Development Exemption: M.G.L. Chapter 64H, sections 6(r) and 6(s), exempt materials, tools, fuel, machinery and replacement parts used directly and exclusively in research and development by a qualifying research and development or manufacturing corporation, and the Department of Revenue has permitted contractors to purchase qualifying items as agent for such an owner where the arrangement is properly documented. Qualification is determined annually and the standard of directly and exclusively is applied narrowly, so building services and general fit-out items will not qualify. On a Kendall Square project this is worth reviewing item by item rather than assuming either answer.
Retainage and Prompt Payment on Private Work: M.G.L. Chapter 149, section 29F, caps retainage at five percent on private commercial projects above a statutory contract value and sets a defined sequence of substantial completion notice, punch list window and release deadline. Section 29E of the same chapter limits the time an owner or general contractor has to approve or reject a payment application, and an application not rejected in writing with a stated factual basis inside that window is treated as approved. On lab work the fight is over the trigger date, because substantial completion arrives well before commissioning and validation are finished. Records have to show the dates.
Cambridge Permitting and Article 22: Building permits in Cambridge are issued through the Inspectional Services Department, which enforces the Massachusetts State Building Code and the city zoning ordinance, while the Community Development Department reviews sustainable design documentation under Article 22 of the zoning ordinance before a permit is issued and again before the first Certificate of Occupancy. That review cycle takes real staff time and it is a project cost, not a general office cost. We keep permitting, expediting and compliance documentation coded to the job that required it, because otherwise the bid never learns what those weeks are worth.
BEUDO and the Existing-Building Retrofit Pipeline: Cambridge amended its Building Energy Use Disclosure Ordinance in June 2023 to require non-residential buildings of 100,000 square feet or more to reach net zero emissions by 2035, with buildings of 25,000 to 99,999 square feet given until 2050, measured against a 2018 and 2019 baseline through compliance periods that begin in 2026 and 2030. For mechanical, electrical and controls contractors this is a decade of electrification, heat recovery and envelope work in occupied lab and office buildings. It is phased, largely after-hours, and it needs cost codes that survive being split across multiple compliance years.
Union Fringe Funds and Occupied-Building Premium Labor: Large Cambridge institutional and life sciences work is predominantly union, and a single tradesperson can carry health and welfare, pension, annuity and training fund contributions at separate rates, each with its own monthly remittance and its own fund audit. Fringes are part of what the labor on that job cost you, so they belong on the job rather than in a general payroll account. The same applies to shift differentials and overtime driven by shutdown windows, which is exactly the labor an occupied research building generates and exactly the labor most base bids underestimate.
A general bookkeeper can record transactions. Construction accounting is a different job.
| What you need | Generic local bookkeeper | FinTruction |
|---|---|---|
| Job-level costing | Lumps all jobs into one P&L | Cost codes and margin per project |
| WIP & revenue recognition | Cash-basis, no WIP schedule | Monthly WIP with over/underbilling |
| Retainage tracking | Buried in AR/AP, often missed | Tracked receivable & payable by contract |
| Bonding & lender packages | Not equipped to produce them | Bonding-ready statements and backlog |
| Construction software | QuickBooks set up like a retail shop | QuickBooks + integrations tuned for contractors |
We support contractors across Cambridge, from the mechanical and process piping houses building labs in Kendall Square and East Cambridge to interior and specialty trades working occupied buildings in Central Square, Harvard Square and along the Alewife corridor.
Running a Construction Company in Cambridge?
Get Your Free AuditA fair question if you already have a bookkeeper and a CPA who prepares the return. Here is the honest answer.
Most Cambridge contractors do not need new software. They need what they already pay for set up for construction and wired into the accounting, so the pay application and the monthly WIP fall out of normal work instead of becoming a second job.
Most QuickBooks files we inherit were configured for a business that sells products off a shelf. For a lab fit-out contractor that means jobs are set up as customers, cost codes do not follow building systems, equipment deposits are expensed the day they are paid, and retainage disappears inside accounts receivable where nobody chases it.
Is your QuickBooks file working against you?
If your project managers are already tracking budgets, commitments and change orders in a construction platform, the office should not be retyping any of it. We connect the field system to the accounting so the commitment log and the general ledger agree, which on a fit-out with hundreds of open change items is the difference between a monthly close and a monthly argument.
One set of numbers that both the field and the office believe.
Once the systems are connected, reporting stops being a history lesson. These are the reports Cambridge contractors use to decide which fit-out to chase and which one to let somebody else carry:
Statewide context, including public bidding and certified payroll, sits on our Massachusetts construction accounting page, and nearby contractors can read about construction accounting in Boston.
Because Cambridge work is mostly laboratory and institutional fit-out, and that is the hardest thing in construction to cost correctly. A Kendall Square lab build is dominated by mechanical, electrical and process piping value rather than by the shell, the long lead equipment is ordered and paid for months before it reaches the site, and the research program driving the design keeps moving while you build. On top of that sit AIA G702 and G703 billing with documentation behind every line, retainage held until commissioning is signed off, and a landlord improvement allowance that only reimburses what you can prove. General bookkeeping produces none of that.
Three things change. First, the cost mix inverts: most of the money sits in mechanical, electrical, plumbing, controls and specialty equipment, so cost codes built around a commercial shell tell you almost nothing useful. Second, cash leaves early. Air handlers, chillers, switchgear, fume hoods, cold rooms and biosafety cabinets carry long lead times and vendor deposits, so you are financing the job before a single hour of field labor is billed. Third, the scope moves. A change in headcount, instrument list or containment level rewrites the mechanical design mid-build. The accounting has to hold all three at once.
Stored materials belong on their own line of the G703 continuation sheet, and on lab work that line is often the difference between positive and negative cash. Most owner contracts will pay for materials stored off site only against specific proof: a paid invoice or bill of sale transferring title, evidence the goods are segregated and identified to the project, a certificate of insurance covering them where they sit, and sometimes the owner or lender consenting to the storage location. If the documentation is not assembled when the deposit is paid, the line gets rejected and the contractor carries the equipment cost.
Usually not, and that distinction matters more in Cambridge than almost anywhere. The Massachusetts prevailing wage law in M.G.L. Chapter 149, sections 26 through 27, applies to public construction awarded by a public body, so privately funded work for a university, a biotech tenant or a private developer generally falls outside it, while City of Cambridge municipal buildings, school projects, public infrastructure and state-funded work fall squarely inside. The risk is a contractor carrying both kinds of job in the same week, running one payroll, and discovering that the public job needed a Department of Labor Standards wage schedule and weekly certified payroll all along.
A Massachusetts contractor is normally treated as the consumer of the materials it installs into real property, so it pays the 6.25 percent sales tax on purchase rather than charging tax on the contract. On a project for a governmental body or an IRC Section 501(c)(3) exempt organization, which covers most Cambridge university, hospital and institutional work, the contractor can buy materials exempt using Form ST-5C, the Contractor Sales Tax Exempt Purchase Certificate, supported by the owner Form ST-2. The exemption also reaches equipment rented for use on the exempt site. It has to be claimed at the time of purchase, not reconstructed at year end.
Sometimes, and it is worth checking rather than assuming. M.G.L. Chapter 64H, sections 6(r) and 6(s), exempt materials, tools, fuel, machinery and replacement parts used directly and exclusively in research and development by a qualifying research and development or manufacturing corporation, and the Department of Revenue has allowed contractors to buy qualifying items as agent for such an owner where the arrangement is properly documented. The qualification is tested annually and the words directly and exclusively are read narrowly, so office, sales and general building service items do not qualify. The answer lives in your purchasing records.
By separating three numbers that most contractors collapse into one. The base contract is what you were awarded. Approved changes are what has been signed and priced. Pending and unpriced work is everything the owner has directed, the design team has issued, or the field is already building, with no executed change order behind it. On a life sciences fit-out that third number grows fast and quietly, because construction manager and design build delivery encourages the field to keep moving. We report all three every month so you can see how much of the job is being performed on a promise.
It means a decade of retrofit work in occupied buildings. In June 2023 Cambridge amended its Building Energy Use Disclosure Ordinance to require non-residential buildings of 100,000 square feet or more to reach net zero emissions by 2035, with buildings between 25,000 and 99,999 square feet given until 2050 and reductions measured against a 2018 and 2019 baseline through compliance periods beginning in 2026 and 2030. For mechanical, electrical and controls contractors, that is electrification, heat recovery and envelope work performed around tenants who cannot move out, which is phased, after-hours and expensive to cost properly.
A laboratory is not finished when the drywall is. Fume hood face velocity testing, cleanroom particle counts, controls point-to-point verification, air balance and owner validation all happen after substantial completion, and the cost of returning crews for punch and retest lands on a job that has already been billed to ninety-five percent or more. Contractors who carried no separate budget for that tail watch a profitable job give margin back in its final month. We keep commissioning, punch and warranty callback as their own cost codes so the estimate to complete stays honest to the end.
Start with the free Audit. Send your current accounting file and your last job profitability or WIP report, and we will tell you what is wrong, what it is costing you, and what it would take to fix. There is no obligation and no sales call required to get the answer. After that it is a flat monthly fee based on transaction volume, active jobs and reporting needs, so calling us in the middle of a bid does not start a clock. Sahil Ahmad, CPA reviews the work before it goes to your bank, your surety or your tax preparer.
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Send your current accounting file and your last job profitability or WIP report. We will tell you what is wrong with it, what it is costing you, and whether your equipment deposits and unpriced change work are being counted at all. No charge and no obligation for the Audit.
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