Mighty Buildings ADU Site Prep & Utilities in North Hollywood: What to Know First
We provide independent Mighty Buildings ADU site prep and utilities in North Hollywood, with most foundation and utility jobs scoped, permitted, and underway within two to three weeks of your first call. Every project carries a written price before any work starts, per Haven Standard Clause 1 - no range that balloons, no “let’s see what we find.” If you own a Mighty Buildings unit and need grading, electrical service, plumbing laterals, or gas line extension handled by a team that actually knows the M and Duo series, call (424) 407-8266 to schedule your free estimate. This page is for North Hollywood homeowners who chose Mighty Buildings for the fast install timeline and now need the site work finished with the same precision.
How Mighty Buildings Products Fail - and How We Fix Them
- M Series foundation misalignment from composite panel thermal expansion. The M Series uses a proprietary fiber-reinforced composite skin that moves differently than conventional framing in North Hollywood’s 100°F summer-to-50°F winter swing. We’ve seen units where the foundation pad was poured to standard dimensional tolerances, then the panel expansion created a 3/16-inch gap at the sill plate by year two. We specify a floating sill detail with compressible gasket material, documented in the permit set so the inspector signs off on the gap allowance.
- Duo Series electrical panel overload from undersized service feeders. The Duo Series ships with a 200-amp spec sheet, but some early North Hollywood installs used 150-amp feeders because the original main house service wasn’t upgraded. The composite walls don’t allow easy retrofit access later. We pull a separate load calc for the ADU before the Mighty Buildings crew arrives, and we upsize the feeder in the same trench rather than trenching twice.
- Plumbing lateral slope failure on compacted fill lots. Mighty Buildings units need a 1/4-inch-per-foot drain slope minimum, but the flat pads common in the Valley District near Lankershim often settle after the first rainy season. We bore a laser-leveled pilot hole before backfill and document the slope with photos - part of the photo record you receive under Haven Standard Clause 3.
- Gas line extension corrosion at the composite-to-steel transition. The M Series has a steel sleeve penetration for gas that can galvanically corrode where it meets the composite wall panel, especially in North Hollywood’s clay-heavy soil near the Tujunga Wash. We spec a dielectric union and wrapped coated pipe, and we flag this for your annual inspection so it doesn’t become a leak search two years out.
- Landscaping and hardscape conflict with the unit’s zero-lot-line footprint. Both M and Duo series are designed for tight setbacks, which means the 18-inch maintenance access zone gets paved over by homeowners who weren’t told. We mark the access zone on the as-built drawings and specify permeable pavers within it, so you don’t need a jackhammer and a variance request later.
Our Mighty Buildings ADU Site Prep & Utilities Process
- 1
Site survey and Mighty Buildings spec review. We pull your unit’s serial number and production batch to confirm which composite formulation and connection details apply - the M Series changed its floor joist spacing in 2022, and we verify before we draw.
- 2
Load calc and utility capacity check. We test your existing electrical panel, water main, and gas meter against the unit’s spec sheet, not a rule of thumb. If your 1960s North Hollywood bungalow has a 100-amp service and you’re adding a Duo Series, we tell you now, not after the trench is open.
- 3
Permit set submission with Mighty Buildings engineering letters. We include the manufacturer’s structural connection details in our permit package - most North Hollywood plan checkers at the Valley Branch have seen Mighty Buildings before, but they still want the letter.
- 4
Foundation and utility rough-in. We pour to the unit’s exact bolt pattern and keep the utility stub-ups within 2 inches of spec. Our crews have installed Abodu, Cover, and Dvele units too, so they recognize when a prefab detail needs field adjustment.
- 5
Unit set, connection, and pressure test. We coordinate with your Mighty Buildings delivery crew for the set date, then make final electrical, plumbing, and gas connections. Every system gets a live test with documented readings.
- 6
Final inspection, photo record delivery, and 365-Day Done Right Promise activation. You receive the permit card, the photo record, and the written warranty before we invoice. If the finished work doesn’t match the permitted drawings, we make it right.
What Mighty Buildings ADU Site Prep & Utilities Costs in North Hollywood
Mighty Buildings site prep and utilities in North Hollywood typically run $18,500-$42,000 all-in, from first survey through final inspection. Here’s what moves you within that range:
| Foundation and grading (flat lot, no export) | $8,500-$14,000 |
| Foundation and grading (fill removal, slope correction) | $14,000-$22,000 |
| Electrical panel upgrade + ADU feeder | $4,500-$8,500 |
| Plumbing lateral (city main to unit, ≤50 ft) | $3,500-$6,500 |
| Gas line extension (≤30 ft, no meter upgrade) | $2,000-$4,000 |
| Landscaping and hardscape (permeable pavers, access zone) | $3,500-$9,000 |
These are the ranges we put in writing before you sign, per Haven Standard Clause 1. Your actual price depends on lot conditions, utility distances, and whether your North Hollywood property needs a sewer lateral replacement the city has been nagging you about. Call (424) 407-8266 for an exact quote - estimates are free.
Why North Hollywood Homeowners Call Ellery ADU Studio North Hollywood for Mighty Buildings Work
We’ve specified and coordinated prefab and modular systems from Abodu, Cover, Dvele, Mighty Buildings, Boxabl, Plant Prefab, Tuff Shed, and James Hardie - so when your Mighty Buildings crew says “nobody’s asked for that detail before,” we can cite the manufacturer’s own drawing. The 365-Day Done Right Promise covers our site prep and utility work in writing, not a handshake. Our license number appears on every page, our crews are background-checked and uniformed, and a live person answers calls 24/7. Nadia Ellery keeps that battered California Residential Code on her desk for a reason. Tell me the lot dimensions and I will tell you what fits - everything else is paperwork we handle.
FAQs
No - Mighty Buildings’ structural warranty covers defects in manufacture, not the site work you hire separately. As an independent Mighty Buildings service provider, we coordinate with their set crew and use their published connection details, but our foundation and utility work is warranted under our own 365-Day Done Right Promise. Keep your Mighty Buildings warranty card and our written scope together; they cover different things. Call (424) 407-8266 if you want us to review both documents before you decide.
We use Mighty Buildings’ specified anchor bolts, flashing, and penetration sleeves where the manufacturer publishes a part number - this is standard for M and Duo series installs. For utility transitions (dielectric unions, coated pipe, compressible gaskets), we spec quality aftermarket parts that meet or exceed the OEM performance spec, documented in your permit set. We don’t guess; we name the manufacturer and part number in the written scope. Call (424) 407-8266 to see a sample scope.
We camera the sewer lateral and load-test the electrical panel before we quote. If your North Hollywood home was built before 1975 and still has galvanized water service or clay sewer, replacement is usually cheaper than repair within five years. We show you the camera footage and the load test readout, then price both options in writing. No option is “recommended” without the evidence. Call (424) 407-8266 to schedule the diagnostic.
Foundation and utility rough-in typically takes 10-14 working days after permit release in North Hollywood, assuming no buried surprises. The Valley Branch plan check for Mighty Buildings packages averages 10-15 business days if the engineering letter is complete. We coordinate your set date with Mighty Buildings’ logistics team once we pass rough inspection, not before. Call (424) 407-8266 and we’ll walk through the timeline for your specific lot.
No - under Haven Standard Clause 5 (No Surprises), the scope is locked at signing. If we hit a buried condition we couldn’t reasonably foresee (a undocumented septic tank, a utility line off the map), we document it, stop work, and present a written change order with photos before proceeding. You approve or decline; we don’t proceed on verbal. In nine years and 900-plus ADUs, our change order rate on site prep is under 4 percent. Call (424) 407-8266 for a written price before any work starts.
Written by Nadia Ellery, Owner & Principal Designer, Ellery ADU Studio North Hollywood at Ellery ADU Studio North Hollywood, serving North Hollywood and nearby areas.