- You add
- A second, smaller tote and a foam slab on the bottom.
- You gain
- An air gap and an insulated floor.
- Still limited
- Walls still without foam; plastic remains an unknown thermal layer.
- New material
- Plastic storage tote, EPS foam board
Design class: BudgetValidation status: Data validated
Tote with Straw
A tote raised off the ground, with a high entrance sill and loose straw up to half the height. An inexpensive winter option for one cat until an insulated shelter is built.
A warm shelter that gets damp can be worse than a simpler one that stays dry.
“Data validated” means only the data and calculations are checked; the model has not been built or tested physically.
Capacity1–2
Outside size600 × 400
BuildNo skill needed
Time (estimate)20 min–40 min
This model has no 3D view; the drawing and dimensions below fully describe the construction.
Who this is for
- For beginners with basic tools and a small budget.
- For one cat (up to 2), including community cats.
When not to use it
- For young, old, sick or unacclimated animals without extra protection and supervision.
Tools and calculations
- Required tools
- Utility knife
- Budget class
- Ultra low
- Location
- Exposed outdoor spot
- Supported calculations
- Geometry, Bill of materials, Cost estimate, Drawing, Build guide
Geometry
Dimensions
| Outside size (W × D) | 600 × 400 mm |
|---|---|
| Height front / rear | 350 / 350 mm |
| Raised off the ground | 100 mm |
| Interior | 600 × 400 × 350 mm |
| Entrance | 1 × 150 × 150 mm, sill 80 mm |
| Chambers | 1 |
| Geometry type | schematic envelope (assumption) |
Bill of materials · compiler output
What you have and what to obtain
Quantities come from the model geometry; items marked as assumptions are planning allowances. Reused material must pass the checklist.
Fill in “My workshop” to see what you still need to buy.
My workshopMaterialNeededOwnedStatus
Plastic storage tote1 pcs–Buy
Heavy-duty tape1 pack–Buy
Bricks5 pcs–Buy
Straw1 bale–Buy
- Plastic storage tote1 pcsfrom geometry · A lidded tote without cracks.
- Heavy-duty tape1 packassumption · Cover the sharp edges of the cut opening from the outside.
- Bricks5 pcsassumption · Four stable supports under the corners.
- Straw1 baleassumption · Loosely to a quarter or half of the height; keep the rest dry for refills.
Layers and thermal
Known and unknown layers
No thermal estimate: there is no controlled insulation layer.
Not included
- No controlled insulation layer: straw is bedding and the plastic has no sourced λ.
The estimate is not a temperature guarantee and does not claim the shelter is safe to any temperature.
Water and moisture
Weather exposure
A warm shelter that gets damp can be worse than a simpler one that stays dry. This is an explanation, not a condensation calculation.
- Ground contactRaised about 100 mm off the ground.
- Rain splashHigh enough that rain splash from the ground does not hit the floor.
- Roof drainageThe lid is flat: water runs off to the sides. It must close well and the entrance must not sit below a drip edge.
- Rain at the entranceThe entrance sill is 80 mm above the floor.
- DryingCan be opened to dry out and change bedding.
- Absorbent materialInterior surfaces do not absorb much moisture.
- Maintenance accessAccess for checks and cleaning is simple.
Local price profile
Cost estimate
Quantities come from the model. Prices are not fabricated: enter what you actually pay locally and the estimate stays in your browser.
Plastic storage toteA lidded tote without cracks.
1 itemRSD 0Heavy-duty tapeCover the sharp edges of the cut opening from the outside.
1 itemRSD 0BricksFour stable supports under the corners.
5 itemsRSD 0StrawLoosely to a quarter or half of the height; keep the rest dry for refills.
1 itemRSD 0Estimate from entered pricesRSD 0
Sheet, XPS, framing and hardware quantities come from the compiler. The estimate still excludes delivery, tools, labor, local taxes and unforeseen losses beyond the stated allowances. PROVISIONAL and product-specific items remain explicitly labeled.
Placement
Check the spot
No obvious issue detected
This is not a safety certificate for the spot: it only means none of the listed questions is ticked.
Bedding
What goes inside
- RecommendedStrawRepels moisture and stays loose. Replace when damp, compacted or soiled, and when seasons change.
- Not recommendedHaySoaks up moisture, turns cold and can mould. If already in a shelter, replace it with straw.
- Not recommendedBlanketAbsorbs and holds moisture; a damp blanket chills. Wash and swap as soon as it is damp.
- Not recommendedTowelAbsorbs moisture like a blanket. Wash and swap as soon as it is damp.
- Not recommendedWood shavingsPartly absorbs moisture. Change when damp or compacted.
- Not recommendedWashable dog bedDepends on fabric; textile absorbs moisture. Dry or swap as soon as it is damp.
- Not recommendedNo beddingNothing to absorb moisture. Not applicable.
Maintenance
Inspection schedule
- WeeklyCheck that the straw is dry and loose; replace it when damp or compacted.
- WeeklyCheck for water or dampness on the floor and walls, especially under the entrance.
- After stormsAfter rain or snow check the interior and the ground under the shelter.
- MonthlyCheck the plastic for cracks and sharp edges around the opening.
- Each seasonQualitative: plastic and foam become brittle in sunlight; replace them when they fade or crumble.
- WeeklyCheck that the lightweight shelter is still weighted or secured.
- After stormsClear snow from entrances and exits so the animal cannot be snowed in.
- Each seasonClean the interior; service access must allow cleaning without dismantling.
Upgrade path
Where to go next
Each step states what you add, what you gain and what stays limited. A new model has a new plan ID; changing an existing build has no canonical plan.
Previous step: Single Plastic Tote
- You add
- An EPS lining on every side.
- You gain
- A controlled insulation layer in the tote.
- Still limited
- Foam must be covered by straw and checked for scratching.
- New material
- EPS foam board
Don't have this material?
Plastic storage tote
All substitutes and material limits - EPS shipping boxThe substitute changes the construction (thickness, strength or water protection); parts and joints must be re-planned.
- Old pet carrierThe substitute changes the construction (thickness, strength or water protection); parts and joints must be re-planned.
Build sequence
Build steps
Progress is stored in this browser against the exact plan ID; it works offline once the page has been opened.
0 / 5steps completed
Cut the entrance
Cut a 150 mm × 150 mm opening through plastic storage tote, with the sill 80 mm above the floor so rain and snow stay out. Face the entrance away from the prevailing wind. Cover or sand sharp edges.
Close and weight it
Close the lid and put a brick or stone on it. A light tote must be secured against wind.
Raise the shelter off the ground
Set the shelter on four stable bricks, about 100 mm above the ground, so the floor does not touch cold, wet ground. Check that it does not rock.
Add straw, not hay
Loosely fill straw to a quarter or half of the interior height. Do not use hay, towels or blankets in an outdoor winter shelter: they absorb moisture and chill.
Choose the spot and secure it
Set it against a wall or fence, out of the wind, away from roof runoff and roaming dogs. Weight or secure lightweight shelters. Check the spot with the placement checklist.
Provenance
Sources and verification status
A source supports a guideline or material value, but it does not confirm this specific model. Container sizes are assumptions and build time is a planning estimate.
- Data validatedcurrent
- Geometry validatednot confirmed
- Engineering reviewnot confirmed
- Physical prototypenot confirmed
- Field validationnot confirmed
Alley Cat Allies · Tier 1Straw, not Hay, for Outdoor Cat SheltersStraw repels moisture while hay soaks it up and can mold. Loosely pack straw to the quarter or halfway point; store spare straw dry and off the ground.ASPCApro · Tier 1Winter Shelters for Community Cats: FAQs and Cold Weather TipsSupports small insulated shelters, cat-sized entrances, elevation from wet ground, straw bedding and predator-aware entrance decisions.