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More house, without moving house

A home addition is the answer when the house is right but the square footage is not — the location works, the schools work, and the mortgage works, but there is one room too few. Building on is very often cheaper than buying the same amount of space somewhere else, and you keep everything that made you choose the house.

Additions are the largest part of what we build, and they are the reason our licence class matters. This is structural work: foundations, framing, load paths, and a permit set that a county plans examiner has to approve. GIL Renovation Services holds Florida licence CBC1269967 as a Certified Building Contractor, which is what allows us to take the whole project rather than sub-letting the structural half of it.

We build additions across Jacksonville and Duval, Clay, St. Johns, and Nassau counties.

An open-plan white kitchen with a walnut island, lantern pendant lights and a dining area beyond

The part most people get wrong is the connection

Almost anyone can frame a box. What separates an addition that still looks right in ten years from one that does not is how the new structure meets the old one — and that is decided before a single stud goes up.

Two structures with separate foundations settle at different rates. If the tie-in is not detailed properly, that difference shows up as cracking along the joint, doors that stop closing, and a visible seam down the exterior. We design the connection deliberately and match rooflines, siding, and trim so that when it is finished, nobody can tell where the original house ends.

Additions we build

Every one of these is structural work under a permit, and we handle it end to end.

Room additions

A single room added to the footprint — a larger primary bedroom, a family room, a home office, or a proper dining room where there was never space for one.

In-law and guest suites

A bedroom, bathroom, and often a sitting area added for a family member. Where you want it fully self-contained, that is an ADU instead.

Second storeys

Building upward when the lot will not allow building outward. Structural work first: the existing foundation and framing have to carry the new load.

Kitchen and living expansions

Pushing out the back of the house to make the kitchen and living space one room, which is the most requested addition we build.

Garage conversions and additions

Converting an existing garage into living space, or adding a garage. Conversions need insulation, egress, and HVAC brought up to habitable standard.

Enclosures and sunrooms

Turning a porch or patio into conditioned, year-round space, which in Florida means getting insulation and moisture detailing right.

You will not lose track of your own project

Additions run longer than a room remodel, which makes communication the thing that decides how the experience feels. A four-week silence in the middle of a three-month build is what turns a good project into a bad memory.

Our business partner runs the job sites so Cesar Perdomo can manage customers exclusively. At most companies one person does both, which is precisely why homeowners cannot reach their contractor once work begins. Here, the person you call is not on a ladder.

No run-arounds, no no-shows, and a written proposal in your hands within 48 hours of the consultation.

A room at the drywall stage, taped and finished but not yet painted

How an addition runs

Seven stages. Feasibility comes first on purpose — it is the cheapest possible moment to find out what your parcel will and will not allow.

  1. 1

    Feasibility on your actual parcel

    Before anything is designed we confirm what your lot and zoning district allow — setbacks, lot coverage, and easements. This is the step that stops a project going sideways later.

  2. 2

    Design and architectural drawings

    Additions generally need stamped drawings before a permit can be issued. We tell you at the consultation whether yours does, build to drawings you already have, and review any set with you before it goes in.

  3. 3

    Written proposal within 48 hours

    Full scope and price in writing within two days of the on-site consultation, so you can make a decision on real numbers.

  4. 4

    Permitting

    We submit the permit package, handle any corrections, and schedule every inspection. Our licensed plumbing and electrical subcontractors pull their trade permits under our master permit.

  5. 5

    Foundation and framing

    Site work, foundation, and framing, tied properly into the existing structure so the addition and the original house move as one building.

  6. 6

    Dry-in, trades, and finishes

    Roof and exterior envelope closed in, then mechanical, electrical, and plumbing, then insulation, drywall, and the finishes you selected at Floor & Decor.

  7. 7

    Final inspection and walkthrough

    County final inspection, then a walkthrough with you. Your one-year workmanship warranty starts at completion.

Materials, sourced and delivered

You work with an in-store designer at Floor & Decor on colours, tile, and finishes. Selections go onto a form under our account, and we purchase, collect, and deliver everything to site.

On a project this size that is a genuine amount of work taken off your plate — and it means material delays land on us to solve, not on you.

Drawings and design

Additions frequently need stamped architectural drawings before a permit can be issued. Whether yours does depends on the scope and on your county, and it is one of the first things we tell you — at the consultation, not three weeks in.

If you already have drawings, or an architect you like working with, we build to them and review the set with you first so nothing surprises us at plan review. If you do not have either yet, we will tell you plainly what your project needs and what it will take to get there.

Licensed & insured

Florida Certified Building Contractor CBC1269967, active through August 2028, with $1,000,000 general liability and a $2,000,000 aggregate.

Permits handled

We pull and manage every permit. Our licensed plumbing and electrical subcontractors pull their trade permits under our master permit.

One-year warranty

Every project carries a one-year workmanship warranty across the whole job — not just selected trades.

Home addition questions

The five questions everyone asks before hiring, plus the ones specific to additions.

It depends on the size and scope of the work, so we price every project individually after seeing it in person. As a concrete reference point, a small bathroom of roughly 7x5 typically runs $10,000 to $14,000, and a master bathroom typically runs $17,000 to $35,000, with materials included in both. Your written proposal arrives within 48 hours of the on-site consultation and lays out the full scope and price, so you are never comparing guesses. Estimates and consultations are free.

Ready to add the room you actually need?

Tell us what you have in mind. We will come out, measure, confirm what your lot allows, and put a full written proposal in your hands within 48 hours — free, with no obligation.

State-Certified Building Contractor CBC1269967 · Monday–Friday, 9:00am – 5:00pm