Last checked
May 22, 2026
We checked the page logic, support notes, and related links on this page.
Project planner
Plan the small roof covering before you buy rolls or battens
Small roofs are unforgiving because overlaps, ridge details, edge waste, battens, fixings, and timber finish can use more material than the floor footprint suggests.
5 linked calculatorsScope checklistProject sequence
shed roof plannershed felt calculatorsmall roof material calculator
How to use it
Planning before buying
Use this planner to keep the measurements, material list, and quote scope aligned before anyone prices the work.
Why trust it
See how the site is maintained
Read the calculator methodology and editorial policy for the standards behind these pages.
Measure first
Take these measurements once, then reuse them through the calculators so the order, budget, and quote request stay aligned.
- Roof slope length and width
- Roll or shingle coverage
- Overlap allowance
- Batten run lengths
- Timber finish area
Planning order
Work through the job in this order so the visible finish, hidden layers, accessories, and cost checks are not priced as separate guesses.
Step 1
Measure each roof slope
Measure the actual slope length and width on each side, not the shed floor area. Allow for overhangs, ridge detail, and damaged edges.
Open Shed Felt CalculatorStep 2
Check felt or covering overlap
Use the installed coverage after side laps, ridge laps, drip edges, and trimming rather than the headline roll size.
Open Roof Felt CalculatorStep 3
Add battens if the roof system needs them
Count batten runs, stock lengths, and joins separately from the covering area.
Open Roof Batten CalculatorStep 4
Compare shingle and finish options
If the job changes from felt to shingles or includes timber treatment, check those quantities before ordering fixings and finish.
Open Roofing Shingle CalculatorCalculators in this plan
Each calculator covers one decision in the job: quantity, coverage, depth, fixings, accessories, or budget. Keep the outputs together when you build the buying list.
Step 1Roofing
Shed Felt Calculator
Estimate shed felt rolls and rough cost for sheds, summerhouses, and small outbuildings.
Open calculatorStep 2Roofing
Roof Felt Calculator
Estimate roof felt rolls and rough cost for sheds, garages, and outbuildings.
Open calculatorStep 3Roofing
Roof Batten Calculator
Estimate batten lengths, pieces, and rough cost for roof work.
Open calculatorStep 4Roofing
Roofing Shingle Calculator
Estimate roofing shingle bundles and rough cost from roof coverage area.
Open calculatorStep 5Exterior finishes
Wood Stain Calculator
Estimate wood stain quantities and rough cost for fences, cladding, sheds, and exterior timber.
Open calculatorMaterial checklist
Treat this as the first pass at the buying list. Add product names, sizes, grades, and exclusions before sending it for a price.
- Shed felt or roof felt
- Battens where required
- Shingles if used
- Fixings and trims
- Adhesive or felt nails
- Wood stain or exterior finish
Common mistakes
These are the places where tidy measurement maths often breaks once products, delivery, site access, and labour are involved.
- Using shed floor area as roof area
- Ignoring overlap and ridge waste
- Forgetting fixings and edge trims
Brief to send for pricing
Price the roof covering, lap allowance, ridge detail, battens, fixings, trims, edge details, old felt removal, disposal, and timber finish separately.
Guides worth checking
These pages cover the details that usually decide whether the calculator output is safe to order against.
Guide
Shed Felt Buying Guide
Work out a sensible buying quantity for Shed Felt before you order.
Guide
Shed Felt Waste and Overlap Guide
See how edges, overlaps, and cuts affect Shed Felt quantities.
Guide
Roof Batten Length Guide
Understand how stock lengths and roof geometry change the final order.
Guide
Roofing Shingle Coverage Guide
Understand how effective Roofing Shingle coverage changes the final order quantity.
Related project plans
Open one of these when the job touches another surface, base layer, finish, or outdoor area.
Related workflow5 calculators
Roofline Planner
Roofline work is easiest to price when gutter runs, outlets, downpipes, fascia, soffit, guards, clips, access, and disposal are counted from the same roof edge survey.
Related workflow5 calculators
Decking Planner
Decking needs a surface count and a frame count. Boards, joists, screws, supports, trims, rails, steps, and finish choices should be priced from the same deck size.
Related workflow6 calculators
Garden Surface Planner
Garden surface jobs often mix lawn, soil, seed, bark, membrane, edging, and decorative gravel. Separate the areas before buying materials or asking for landscaping quotes.
Practical answers
Short answers for the decisions that usually come up before ordering materials or sending a quote request.
Why does shed felt need a separate planner?
Small roofs are sensitive to overlap, ridge detail, damaged edges, and roll coverage.
Should I use roof area or floor area?
Use each roof slope area, because the roof is usually larger than the shed floor footprint.
What should I check before buying felt?
Check slope area, roll width, lap allowance, ridge overlap, edge detail, fixings, adhesive, and whether old felt must be removed.