Getting bids is the moment a new-house project becomes real, because the bids translate drawings into dollars. The quality of those bids depends almost entirely on what you hand the contractors, and the discipline that produces a reliable estimate for a repair job like getting bids for rot repair and siding replacement applies with more force when the scope is a whole house.
This article covers the bidding process from bid package to signed contract: writing a complete scope, comparing bids on equal terms, verifying quantities, and choosing a contractor who will build what was priced.
Expect the bids themselves to disagree. Three contractors pricing the same drawings for the same house commonly land 10 to 30 percent apart, and the spread is rarely about honesty. It is almost always about scope, quantities, or quality assumptions, which is exactly why the comparison process matters more than any single number.
Build the Bid Package Before You Call Anyone
Contractors price what they can see. Incomplete drawings produce either padded bids or gaps that surface later as change orders, so the bid package is the single biggest factor in bid quality. The practical guide to getting bids for rot repair shows the pattern at small scale: a defined scope, clear quantities, and a deadline produce comparable numbers, and the same rules scale up to a house.
What a complete bid package contains
- Full construction drawings: site plan, floor plans, elevations, and sections
- A written scope of work that names inclusions and exclusions
- A finish schedule that specifies products, models, and colors
- Assembly specifications for the foundation, structure, and envelope
- A bid form that asks every contractor to price the same line items
- A submission deadline and a named contact for questions
Solicit three to five bidders, no more. Fewer than three gives you nothing to compare, and more than five makes the best contractors decline because they read the list as a fishing expedition. Ask each bidder the same questions at the same time, and give them the same answers, because a bidder who gets a private detail the others lacked is not a bargain, he is a liability.
The bid form is the equalizer
Give every contractor the same blank form with the same line items in the same order. A uniform bid form turns a pile of differently formatted estimates into a spreadsheet you can compare row by row, and it makes omissions obvious when a contractor leaves a line blank. The bid form is also the first test of diligence: contractors who fill it out completely tend to run complete projects.
Write a Scope of Work That Matches the Specs
The scope of work is the contract between the drawings and the bid. A scope that says install windows per plan leaves room for interpretation, while a scope that names the window manufacturer, model, and installation method removes it. The same lesson appears in the construction specifier’s analysis of exterior wall assemblies: are you getting what you specified, which shows that assemblies described loosely get built loosely, no matter how detailed the drawing is.
Inclusions and exclusions
List what is included and what is not, in writing. Demolition, site cleanup, temporary utilities, dumpster rental, and permit fees are the items that disappear from a vague scope and reappear as extras. An explicit exclusion list is just as valuable as an inclusion list, because it prevents surprises on both sides and gives the owner a written answer when a cost appears that was never discussed.
Walk the specifications line by line with each bidder before they price the work. A fifteen-minute conversation about the foundation, the framing, and the finish schedule catches mismatches between the drawings and the bidder’s assumptions, and it gives the owner a record of what each contractor actually intended to build.
The allowance trap
Allowances for fixtures and finishes need realistic numbers. A $5,000 allowance for kitchen appliances that actually cost $8,000 becomes a $3,000 change order, so set allowances from current retail prices and expect to spend the full amount. When every allowance in a bid is suspiciously round, the contractor is guessing, and the guessing gets billed later.
Rightsize the Project Before You Solicit Bids
Bids are only useful when the project size matches the budget. A house that costs 30 percent more than the owner can finance produces wasted bid documents, not a better house, and it burns the goodwill of every contractor who priced it.
The size-budget gap
Entry-level homes have shrunk as builders respond to affordability pressure, and the strategies builders use for the entry-level housing market apply to custom owners as well: fewer square feet, simpler roof lines, and standard finishes bring bids down without cutting construction quality. The most expensive square foot in any house is the one you add to the plan after the budget is set.
Run the cost-per-square-foot math before the bid documents go out. Divide the budget by the planned area and compare the result with recent new-home construction costs in the region. If the number lands below the local range, either the area needs to shrink or the budget needs to grow, and the bid phase is the wrong time to discover which.
Value engineering before the bid
Cut scope before the bid, not after. Removing a dormer or switching to stock windows changes the drawings the contractors price; asking for a discount after the bids arrive changes nothing except the relationship. Three rounds of plan review catch more cost than three rounds of bid negotiation.
Protect the Site During Bidding and Construction
Between the first bid walkthrough and the final walkthrough, the site holds expensive materials and open work, and a construction site is a tempting target because the doors are rarely finished.
Site security basics
- Install locks on all exterior doors as soon as they are hung, and rekey after handover
- Control keys: sign them out, log them, and collect them from every crew
- Schedule material deliveries to land just before they are installed
- Light the site at night and secure tools in a locked trailer or job box
- Fence the lot when it sits vacant between phases
The entry methods described in the guide to getting back into a locked house are exactly what a thief uses, which is why the prevention strategies in that guide matter on a construction site: deadbolts, reinforced strike plates, and recorded key control close the same doors on both sides.
Security extends to the paperwork. Ask each bidder for an insurance certificate naming the owner as additionally insured, and verify that the coverage is current before the first payment is made. A contractor who cannot produce a certificate at the bid stage will not produce one at the claim stage either.
Insurance and lien waivers
Collect lien waivers with each payment. A lien waiver protects the owner from paying a subcontractor who was never paid by the general contractor, and it costs nothing but a signature. Waive the right to lien only for the amount actually paid, and require the general contractor to collect waivers from every sub before the check clears.
Verify Quantities and Measure the Work
Bids disagree for two reasons: different prices or different quantities. Comparing prices is only meaningful after the quantities match.
Checking the math
Takeoffs should agree across bids. When one bid prices 2,000 square feet of siding and another prices 2,400, the difference is a quantity error, not a price difference, and no negotiation fixes it. A good tape measure and a walkthrough with the plans catch quantity errors before the contract is signed, and the buying guide for tape measures used in construction covers the models that survive daily site use.
| Line item | Bidder A | Bidder B | Bidder C |
|---|---|---|---|
| Foundation and slab | $34,000 | $36,500 | $33,200 |
| Framing and dry-in | $58,000 | $55,000 | $61,000 |
| Plumbing, electrical, HVAC | $41,000 | $44,500 | $39,800 |
| Finishes and fixtures | $52,000 | $49,000 | $56,400 |
| Total | $185,000 | $185,000 | $190,400 |
The example above shows why line-item comparison matters: the three totals are close, but the lines underneath move in opposite directions. Bidder B is cheap on framing and finishes but expensive on the foundation, which is worth a question about soil assumptions. Bidder A is the middle of the pack everywhere, which usually signals a balanced estimate. The total alone would have hidden all of it.
Unit prices for the extras
Ask every bidder to attach unit prices for common extras: additional outlets, extra linear feet of countertop, additional square feet of flooring. Unit prices turn a mid-project change from a negotiation into a line item, and they reveal which contractors price fairly on the small stuff.
Choose the Contractor, Not Just the Number
The lowest bid is the starting point of the decision, not the decision itself. A bid that is 10 percent low deserves a reason, and the reason is usually one of three: a different scope, a different quality level, or a mistake.
The reference check
Call recent clients and ask three questions: Did the project finish on schedule? Did change orders stay reasonable? Would you hire the contractor again? Then visit a completed project and look at the details that photographs flatter, like trim joints, flashing, and the garage floor.
The advice to pick a project before you pick a tool applies to contractors as well. Owners who know exactly what they are building judge a bid against a fixed scope, while owners with a vague idea compare personalities. The first group picks contractors; the second group gets sold to.
The contract
The signed contract should name the scope, the schedule with a start and finish date, the payment schedule tied to completed milestones, the change order process, and the dispute process. A contract that answers those five questions is not a formality, it is the bid converted into obligations, and it is the last document the owner signs before the first check is written.
One final negotiation point belongs before the signature: the payment schedule. Tie each draw to a completed, inspected phase rather than to a calendar date, hold back a retention amount until the punch list is finished, and keep the final payment large enough that the contractor wants to come back for it. That single clause does more for the end of the project than any amount of bid comparison.