5 Mistakes to Avoid With Home Addition Contractor

5 Mistakes to Avoid With Home Addition Contractor

The most expensive mistake Los Angeles homeowners make with a home addition contractor isn’t choosing the wrong flooring or a bad layout. It’s signing a contract that quietly gives the contractor every right to charge more, finish late, and walk away clean if things go sideways. We’ve spent fifteen years untangling the messes left behind by vague agreements, and the pattern is always the same: the homeowner never knew which five clauses to check. Here they are, with exactly what the right version looks like.

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Mistake 1: Paying More Than 10% or $1,000 Upfront (Whichever Is Less)

Most homeowners in Los Angeles don’t know that California law caps the deposit a contractor can legally take before work begins. Business and Professions Code 7159 says the down payment cannot exceed 10% of the total project price or $1,000, whichever is less. That’s not a guideline. It’s the law.

And yet we regularly meet homeowners who handed over 30%, 40%, even 50% of a six-figure addition just to get on the schedule. A contractor asking for that kind of money upfront is either unaware of the law or hoping you are. Either way, it’s a bad sign. Once a contractor holds half your budget, the leverage flips entirely. If they slow down, you can’t fire them without a fight over the money. If they disappear, you’re out tens of thousands with nothing to show.

The right version: a deposit that respects the legal cap, followed by progress payments tied to completed, inspected milestones. You should never be asked to pay for work that hasn’t happened yet. At Lodgewick ADU Builders home, we write the payment schedule into the contract line by line, and the first payment never exceeds what California allows. If a contractor pushes back on the 10% cap, that’s your cue to find a different contractor, not a different bank account.

Mistake 2: Letting a Contractor Pull Permits After Work Starts

This one sounds technical, which is why so many LA homeowners let it slide. Here’s the plain-English version: the moment a contractor begins demolition or framing without an active permit, the homeowner is the one exposed. Not the contractor.

Permits in Los Angeles are tied to the property address, not the contractor’s license. If a neighbor files a complaint or a city inspector drives by and sees unpermitted work, the city issues a stop-work order against the property. That order follows the house, not the builder. It can delay the project for months. It can force you to reopen walls for inspection. In some cases, unpermitted square footage becomes a problem when you try to sell or refinance, because the tax roll and the permit record don’t match.

A contractor who pulls the permit after demo starts is telling you they couldn’t wait for approval. But the approval isn’t a formality. It’s the thing that proves the work meets structural, electrical, and fire code. The right version: the permit is issued before a single tool touches the property, and the permit number is written into the contract. When you work with an experienced Home Addition Contractor in Los Angeles, permits are part of the pre-construction checklist, not an afterthought.

Mistake 3: Agreeing to a Scope of Work Written in Paragraphs

A paragraph can hide a lot. “Kitchen addition with standard finishes, electrical, and plumbing” sounds fine until you’re told that “standard” means builder-grade everything, and the pendant lights you wanted are a change order. Then another change order for the pot filler. Then another for the under-cabinet outlets.

Vague scope language is where change orders are born, and change orders are where budgets go to die. A Los Angeles addition that starts at $180,000 can quietly become $240,000, not because anything unexpected happened, but because the contract never pinned down what was included.

The right version is a scope of work built line by line: specific square footage, specific material grades, specific fixture allowances, specific appliance connections, specific paint counts, specific door and window counts. If it’s not on the line item, it’s not in the bid. We learned this lesson building accessory dwelling units (a secondary home on the same lot, often called a granny flat or casita) in tight backyards all over Los Angeles. A line-item scope protects both sides: the homeowner knows what they’re getting, and the contractor knows what they’re building. Every project under The Kingswell Guarantee starts with a written price tied to a written, line-item scope. No paragraphs. No guesswork.

Mistake 4: No Written Arrival Window and No Cleanup Standard

“We’ll be there in the morning” is not an arrival commitment. It’s a guess. And in Los Angeles, where a forty-minute drive can become a two-hour drive with one crash on the 405, “morning” can mean 7 a.m. or 12 p.m. If you’re taking time off work to meet the crew, that vagueness costs you real money.

The right version is a defined arrival window written into the contract, the same way a delivery company commits to a window. Our crews commit to a specific window, and if something changes, you get a call from a live person, not a text from an unknown number. That’s part of The Kingswell Way: say the price before the work, show up in the window given, leave the place cleaner than found, put the guarantee in writing, come back if it fails.

Cleanup is the other half of this mistake. A home addition in Los Angeles often means your family is living on the property during construction. Debris, nails, and dust tracked through your hallway isn’t just annoying, it’s a safety issue for kids and pets. The contract should state that the job site gets cleaned daily and the final walkthrough includes full debris removal. If a contractor acts like cleanup is extra, that’s a warning sign you’re working with someone who doesn’t respect the fact that this is your home, not just a project site.

Mistake 5: Skipping the Mechanic’s Lien Waiver Process

A mechanic’s lien is the legal tool a subcontractor or supplier can use to claim a stake in your property if they don’t get paid. Here’s what most Los Angeles homeowners don’t realize: you can pay your general contractor in full, on time, every time, and still get a lien filed against your house if the general contractor fails to pay the electrician, the plumber, or the lumber yard.

The protection is called a lien waiver. There are two kinds you need to know:

1. 1
   Conditional lien waiver: used when a payment is being made but hasn’t cleared yet. It says, “once this check clears, I give up my right to lien for this amount.” This is the one you collect at every progress payment.
2. 2
   Unconditional lien waiver: used after the payment has cleared. It says, “I’ve been paid and I release my lien rights for this amount.” This is the one you verify after each check clears.

The process is simple but critical: before every payment, collect a conditional waiver from every subcontractor and supplier on the project. After the payment clears, collect the unconditional version. If a subcontractor doesn’t get paid, the lien goes against your property, not the contractor who stiffed them. That’s a legal mess that can block a future sale or refinance for years.

In our experience with Garage Conversion Contractor in Los Angeles projects, the lien waiver conversation is the one homeowners are least prepared for. Most have never heard of it. A good contractor handles the waivers proactively and attaches them to every progress payment. A bad contractor hopes you never learn the word.

What the Right Process Looks Like

You don’t have to catch every one of these mistakes on your own. When we work with homeowners in Los Angeles, we walk them through a contract that already has the legal deposit cap, the pre-construction permit commitment, a line-item scope, a written arrival window, daily cleanup standards, and a lien waiver schedule. It’s not magic. It’s just doing the paperwork right the first time.

When a project runs well, it looks boring from the outside. That’s the point. A good home addition should feel predictable. You should know what’s being built, what it costs, when the crew arrives, what gets cleaned, and who’s been paid. If any of that is fuzzy, the fuzziness is doing work for someone, and it isn’t you.

If you’re in Los Angeles and wondering when to call a pro, the honest answer is before you sign anything. A second set of eyes on a contract costs nothing and can save you six figures. Related services we handle include ADU Builders in Los Angeles work, garage conversions, and full home additions.

The Bottom Line

Five mistakes. One theme: the paper controls the project. Pay no more than the legal deposit cap. Demand permits before demo. Get a line-item scope. Put arrival windows and cleanup in writing. And never skip lien waivers. These are the things that turn a dream addition into a horror story in Los Angeles, and every one of them is preventable before the first nail goes in.

If you’re planning a home addition in Los Angeles, we’d rather help you get the contract right than watch you pay to fix a bad one. (254) 602-5618 will put you in touch with a live person, day or night. Estimates are free, and they come in writing before anything else happens.

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