Prior to COVID, we had plans drawn up for an addition of approximately 1,000 square feet to our home that essentially rearranged most of the ground floor and added a large kitchen and a laundry room onto the back of the existing structure. Second floor above that is a new master bedroom with a walk-in closet and a master bath that is half new construction and the other half adapted what was a very small bedroom. We also added a "foyer" to the front of the house. (You previously walked almost right into the front steps.) I share this just to provide context to the scale of the project.
In 2015, we had refinanced our original 30-year loan into a 15, knocking about ten years off while only adding a couple hundred per month (Rate went from 5.25 to 3). We didn't have enough equity in the house to do the entire project, but I had read about renovation loans through a company called
Renofi. We worked with them, and they do a lot of the legwork to match you up with a bank that will fund the project, based on the equity already in your house as well as the projected value once the work is complete. In our case, the addition was completely transformative to a small, older colonial that was only 1,600 square feet to begin with.
Renofi hooked us up with a local credit union that was really good. Now, we began work in late 2021, when, as you'll recall, inflation was soaring AND the supply chain problems were at their worst. So the project wound up costing more than we had anticipated, which is almost always the case anyway. We did lock down the costs by purchasing many things as soon as we could, way before we needed them. I had all the new kitchen appliances and the upstairs bathtub sitting in my garage for about nine months, for example.
The loan was for about $225,000 and the project wound up being closer to $350,000, but we used some from savings, some was pay as you go, and we even hit my parents for an interest-free loan on the last $25,000. It was close!
This is more info than the OP asked for, but the context is, I think, helpful. But check out Renofi - they were great and really made what I thought was not going to happen into a reality without killing us or making us house poor.