Comparisons · 4 min read

Fixed Price vs. Cost-Plus: Budgeting Your Hillsboro Project

Deciding how to pay for your home renovation or ADU in Hillsboro? We're breaking down fixed price and cost-plus contracts so you can pick the best option for your budget and peace of mind.

← Back to Blog Completed budget development work at a residential property in Hillsboro, OR

Alright, let's talk money. When you're looking to get a big project done on your home here in Hillsboro — maybe an ADU, a major remodel, or even just a big deck — one of the first things you'll butt heads with is how the contractor is going to charge you. You've basically got two main ways to go: a fixed price contract or a cost-plus contract. Both have their place, but they're definitely not created equal for every situation.

Fixed Price Contract: What You See Is What You Get

This is probably what most folks think of when they imagine hiring a contractor. We give you a single, all-inclusive price for the entire scope of work. That price covers materials, labor, permits, our overhead, and a reasonable profit margin. Once we agree on it and sign, that's the number, barring any changes you make along the way.

Pros:

  • Predictability: You know exactly what you're paying upfront. This is huge for budgeting, especially if you've got a strict limit.
  • Less Financial Risk for You: If material costs suddenly jump, or if we run into an unexpected issue that's *our* fault (like miscalculating labor hours), that's on us, not you.
  • Simpler: It's just easier to understand. One number. Done.

Cons:

  • Less Flexibility: If you decide halfway through you want to upgrade the flooring or add a window, that's a change order, and it'll cost you extra. Those changes can add up fast.
  • Can Feel Higher Upfront: To protect ourselves from unforeseen issues, we'll often build in a contingency to a fixed price. It's not a secret markup; it's just smart business.
  • Less Transparency: You don't necessarily see every single receipt for materials or every hour of labor. You're paying for the outcome, not the individual components.

Cost-Plus Contract: Open Book, Shared Risk

With a cost-plus contract, you pay for the actual cost of materials, labor, subcontractors, and other direct project expenses. On top of that, we add a pre-agreed percentage (the 'plus') for our overhead and profit. So, if we build an ADU, you'll see the invoices for the lumber, the plumbing fixtures, the electrician's bill, and then our percentage on top.

Pros:

  • Transparency: You see every single cost. We'll provide all the invoices and time sheets. It's like an open book.
  • Flexibility: Want to upgrade that tile mid-project? No problem. We just buy the more expensive tile, and your 'plus' percentage applies to the new cost. No formal change order needed for every little tweak.
  • Potential Savings: If the project goes smoother than expected, or if we find a deal on materials, those savings get passed directly to you.

Cons:

  • Less Predictability: This is the big one. You don't know the final price until the project is done. If we hit an unexpected snag (like finding old lead pipes under your 1950s Hillsboro home), that cost gets passed to you.
  • More Financial Risk for You: You're essentially sharing the risk with us. If the project takes longer or materials cost more, your final bill goes up.
  • Requires Trust: You really need to trust your contractor to manage costs efficiently, because every dollar spent directly impacts your total.

Which One Should You Choose?

For most homeowners, especially those doing their first big renovation or ADU, I usually recommend a fixed price contract. Why? Because the predictability is golden. You know your budget, and you can sleep at night knowing that unforeseen issues (that aren't due to changes you requested) won't blow up your finances.

However, if you're planning a highly custom project, you're comfortable with a bit more financial ambiguity, and you really value seeing every line item, a cost-plus contract can work. It's also a good fit if you anticipate making a lot of design decisions as the project unfolds. But you need a contractor you absolutely trust, with a track record of honesty and good communication.

Here in Hillsboro, with our sometimes-tricky soil conditions and older housing stock, a fixed price often gives homeowners the most peace of mind. We've seen enough surprises to know that having a firm number upfront can save a lot of stress. At Aim High ADU Solutions, we're happy to discuss both options and help you figure out what makes the most sense for your specific project and comfort level. Just give us a call.

Ready to Get Started in Hillsboro?

Contact Aim High ADU Solutions today for a free, no-obligation estimate on your project.

Get Your Free Quote