What Does It Actually Cost to Rebuild in Altadena After the Fire?

We get asked about rebuild costs a lot. Here is what we see happening in Altadena.

The land for a typical Altadena lot runs different amounts depending on location and size. After the fire, lot prices shifted significantly. Combined with construction costs of $400-500 per square foot for standard finishes, you can quickly look at $800k-1M+ to rebuild a modest 2000 sq ft home.

Construction costs break down roughly like this:

• Site work and grading: varies by lot, typically $20-50k
• Foundation and structural: varies by design
• Rough framing: varies by material selection
• Mechanical (HVAC, plumbing, electrical): typically $30-80 per sq ft
• Finishes: varies widely by selections

Engineering fees for LA County plan check submittals typically run $4-15k depending on the lot complexity and what is required. Most Altadena fire rebuilds we see need drainage plans. Some also need grading plans if the lot has significant elevation changes.

The biggest variable is what you do with the land. Three things that can add significant cost are stormwater sump pumps, any work that requires touching the street right of way, and retaining walls.

A stormwater sump pump requires an engineered system, ongoing maintenance, and electricity to run. Street right of way work involves county approvals and permits that add time and cost. Retaining walls can be expensive and often require engineering plus soil reports.

On most Altadena lots, we can design a drainage plan that avoids all three. By comparing pre-fire and post-fire drainage patterns with a hydrology report, we can often show the site drains the same way it did before the fire. This lets us skip the sump pump. We also try to blend into existing neighbor grades and keep driveways at existing grades to avoid street work and retaining walls. Some builders have told us this approach has saved them over $100k in construction costs compared to what was originally proposed.

We have been doing drainage and grading plans for Altadena fire rebuilds since the beginning. We know what LA County wants to see and how to get plans approved without unnecessary back and forth. If you are planning a rebuild, give us a call and we can look at your specific lot.

Frequently Asked Questions

How much does a drainage plan cost for an Altadena fire rebuild? Engineering fees for LA County plan check submittals typically run $4-15k depending on the lot complexity and what is required. Most Altadena fire rebuilds need drainage plans. Some also need grading plans if the lot has significant elevation changes.

Why do I need a drainage plan after the fire? After the Eaton Fire, hillside properties changed how water flows across the land. Without vegetation holding soil together, rainwater runs off faster. LA County requires drainage plans to show how new construction handles this increased runoff and prevents problems for neighboring properties downhill.

Can you avoid using a sump pump on my Altadena lot? Often yes. By comparing pre-fire and post-fire drainage patterns with a hydrology report, we can often show that the site drains the same way it did before the fire. This approach can eliminate the need for a sump pump, saving construction costs and ongoing maintenance.

What information do you need to start my drainage plan? We typically need: a site survey showing existing topography, proposed house location from your architect, and any relevant geotechnical reports. With these documents, we can begin the drainage design process.