A Sophab is an addition to your home, so it answers to your municipality: zoning, setbacks, height, and the loads your climate puts on it. This is the checklist for finding out where you stand — what to measure, who to call, and the exact questions to ask. It costs nothing, and it's the step that decides whether plans are worth buying.
Nothing here needs a drawing, a deposit or an appointment. An hour on the phone and a tape measure will usually tell you whether the shape you designed can go where you want it — and if it can't, whether moving it, shortening it or lowering it fixes the problem.
A Sophab projects off the wall, and that projection is what eats into a side or rear yard. Setbacks and lot coverage are the two rules that stop these projects, and both are arithmetic you can do yourself once you know the numbers.
Development and building officials field exactly these questions all day. Asking about a project before you have drawings is normal, and they would far rather tell you now than turn you back later.
The answers you collect — setbacks, height limits, snow and wind numbers, frost depth — are the same inputs an engineer-ready drawing set is built around. Nothing you do here is wasted work.
Work down the list. The first three are usually enough to know whether you have a project; the rest turn a "probably" into a plan. Take notes — names, dates and what each person told you.
Your design, to hand: quote these when you call. They're the numbers every one of these questions turns on.
Read from the design you have open in this browser. Change it on /start and this follows.
Everything else depends on the answer. A glazed structure attached to the house is usually an addition or a sunroom; a freestanding one is an accessory structure, with different and often looser rules. Ask which category yours falls in before asking anything else.
Who to ask: your municipality's development or planning office. In a rural area it may be a regional service commission rather than a town.
This is the one that stops most projects. Your projection off the wall has to land inside the yard you're allowed to build in. Measure from your wall to the property line yourself first, then compare.
Do the arithmetic: distance from your wall to the line, minus your projection, has to leave the required setback. If it doesn't, a shorter projection or a different wall often does.
Zones cap how much of a lot can be built on. A Sophab adds footprint, so it counts. You need your lot area and the footprint of everything already on it.
Your property tax assessment or land registry record usually has the lot area and the house footprint already.
An arch that climbs the wall has a height, and bylaws measure height in more than one way — from grade, from the first floor, to the peak or to the mid-point of a slope. Ask which.
A lot can sit inside a heritage district, a conservation or watercourse buffer, a flood or coastal-protection area, or a subdivision with private covenants. These sit on top of the zoning and are the most common late surprise.
Private covenants and homeowners' associations won't show up at the town office — check your deed and any subdivision agreement yourself.
Building codes limit how much glass a wall can have as it gets close to a property line. A Sophab is mostly glass, so if it's going on a side wall near the line, this matters.
The egress question is worth asking even when the line is far away — a bedroom window that now opens into an enclosed space may need rethinking.
Snow and wind are local numbers, and they size the structure. Getting them from the authority that will review the project — rather than from a national average — is what makes the eventual drawings match your site.
Write down the code edition too. An engineer reviewing the design needs to know which one applies.
A Sophab lands on piles or a footing. Before that's a plan, find out what's already down there — and note that locating buried services is normally a free call.
Ask your utility locate service to mark the lot before anyone digs. It's free in most places and it's usually required.
The last question is about the paperwork itself, so that when you do commission drawings you commission the right ones.
Being clear about this early saves everyone time. We are the people who design the arch and draw it to your dimensions. We are not the people who sign it off for your municipality — that is your own licensed engineer, and it has to be.
An engineer-ready set: your dimensions on the Sophab Arch, a full rib analysis for your local snow and wind, load-path summary, foundation reactions, rib templates and a materials list.
A licensed engineer in your jurisdiction reviews the set and seals it for your permit. The set is built so they're checking work rather than re-deriving it — which is what keeps that review short.
If you'd rather not run the checklist alone, we consult through it — the calls, the arithmetic, and reading what you're told back into the design. Ask when you're ready.
To be plain about it: we do not provide stamped or sealed plans, and this checklist is not an approval or a legal opinion. Bylaws and codes vary by municipality and change over time, so what your officials tell you about your property always outranks what's written here.
Come back with your setbacks, your height limit and your snow and wind numbers, and the design you built becomes a drawing set your engineer can review and seal.