Structural Repair for Historic Homes in Connecticut, and the 30% State Tax Credit

Old houses in Connecticut fail in a few predictable places. The sill rots where it sits closest to the ground. A girder sags where a post was pulled or a pier dropped. A stone foundation lets go where a century of roof water has washed the fines out of it. Most of it is repairable without touching what makes the house worth keeping.

If the house is on the State or National Register of Historic Places, that repair work may qualify for Connecticut's 30 percent historic homes tax credit, up to $30,000 per dwelling unit. The catch is the order of operations. The State Historic Preservation Office approves the scope before anyone picks up a tool, and the scope has to read as a repair, not a renovation. That is where a structural engineer's repair scope earns its keep.

I'm Travis Busch, a licensed Connecticut PE. I work in timber-frame and balloon-frame houses across the state, and this page is what I tell homeowners who call about one.

What the credit pays for, and what it does not

The Historic Homes Rehabilitation Tax Credit is 30 percent of qualified rehabilitation spending, capped at $30,000 per dwelling unit, so the cap is reached at $100,000 of eligible work. You have to spend more than $15,000 to qualify at all. The State Historic Preservation Office, the SHPO, runs it, and its eligible list includes structural repairs and stabilization, foundation work, carpentry, plaster, chimneys, roofs and windows.

What does not count matters more on a structural job.

• Non-construction costs. The state's guide names architectural, legal, permit and financing fees and excludes any other non-construction cost. That includes my fee. The credit pays for the repair, not the engineering that scoped it.
• Changes to the historic floor plan, additions unless the building code requires one, and new construction. A load-bearing wall removal is a floor plan change, and I will say so on the first call.
• Replacing historic fabric, unless the piece is beyond repair and the replacement is in kind.
• Site work, landscaping, spray foam insulation, appliances, and your own labor.

The money comes back as a voucher after the work is done and paid for, taken against Connecticut income tax with any excess refunded, or sold to a C corporation. Your CPA handles that part, not me.

The order of steps, and why the repair scope comes first

1. Confirm the house is listed, on ConnCRIS, below. A local historic district adds the town's own approval on top.
2. Get the repair scoped. For structural work that is the engineer's job: a visit, then a sealed letter saying what is wrong, what stays, what gets repaired, and how.
3. Get contractor quotes against that scope. The SHPO sets your credit reservation from the estimates in the application, and a reservation is never raised later. A vague scope gets a vague quote, and the reservation can be no better than the quote.
4. File the combined Part 1 and Part 2 application online with photos, the scope and the quotes. Review takes up to 30 days. No work before approval; work already done is ineligible.
5. Do the work. The reservation is good for five years.
6. Pay in full, then file Parts 3 and 4 with receipts, documentation of the work and the five-year owner-occupancy statement. The voucher is the lesser of your reservation or 30 percent of what you actually spent.

The scope is step two because the state approves a plan, not an intention. The statute calls it a rehabilitation plan: construction plans and specifications in enough detail for the state to judge the work against the Standards, with an estimate of the cost, and the reservation is set from that plan. The state's application instructions add that Part 2 may include an engineer's structural report, depending on the work, and that drawings may be required when structural repairs are extensive. Walk in with the scope written and the reviewer has something to approve.

How a repair scope written to the Standards lifts into the application

The SHPO reviews every project against the Secretary of the Interior's Standards for Rehabilitation. The one that governs structural work is Standard 6: deteriorated historic features shall be repaired rather than replaced, and where replacement is unavoidable the new piece matches the old. That is good engineering anyway in a timber frame, where a few large members carry everything. So I write the scope the way the reviewer reads it.

• Repair in kind. A rotted length of sill is cut back to sound wood and a new section of the same size and species is let in, not a steel channel bolted on where a sill used to be.
• Sister and stabilize before replace. A sagging or cracked girder with sound bearing gets a sister or a new post and footing, not a new girder. A post that has punched down gets a new footing, and the post is reset, or replaced in kind if it is beyond repair, not left on a jack post.
• The load path stays where it is. Posts land where they landed. Nothing is opened up or moved to make the repair easier.
• Each item is written the way Part 2 asks: the existing condition, the material, the work, and which photo shows it.

The homeowner hands that letter to the contractor for a quote and attaches it to the application as written.

Check your house on ConnCRIS

ConnCRIS is the state's online map of historic properties, at conncris.ct.gov. Open it, enter the address, and click the parcel. The record says whether the house is individually listed or inside a State or National Register district, and whether it is in a local historic district too. A Register district is enough as long as the house is a contributing building, which the SHPO confirms in Part 1. A survey entry with no Register listing means the house is not listed, whatever its age, and the credit does not apply until it is.

What I do, and what I do not do

I come to the house, go through the cellar, the frame and the attic myself, and write a sealed structural letter: what is there, what is moving, what needs repair and in what order, and the repair details written to the Standards. Where the SHPO or the building department wants drawings, I quote them as their own fixed price. The fee is one fixed number, quoted on the first call.

I do not prepare or file the application, and I do not put a number on your voucher. I do not design repairs to the stone foundation walls. Where a wall is the problem, the letter says what it is doing and what it needs. The repair goes to a mason or foundation specialist, and on a listed house that means lime mortar softer than the stone, never hard portland cement. I will tell you the house is listed and the repair work may qualify. Whether it does is the SHPO's call, and what it is worth to you is your CPA's. If what you actually want is a wall removal or an addition, I do that too, and we will not pretend it is credit work.

Talk to the engineer

Call or text (860) 519-6009 and tell me about the house: the year, the town, and what you are seeing. I will tell you straight whether it needs an engineer, and if it does, you get one fixed price and a visit.