🇰🇲 Comoros · Construction cost guide · Updated 2026
How much does it cost to build a granny flat in the Comoros?
Building a granny flat in the Comoros typically costs $20,790 to $38,610 in construction cost — roughly $462–$858 per m² ($43–$80 per ft²) over 45 m² (484 ft²) of floor area. That excludes land, professional fees and statutory charges.
The Comoros is a relatively low-cost construction market — it ranks 129 of 200 countries on our construction cost index, at about 33% of United States build costs. This page prices a granny flat — self-contained one-bedroom annexe with kitchenette and shower room — at 45 m² of gross floor area, then breaks the cost down element by element so you can see where the money actually goes. Costs are quoted in USD for comparability; the local currency in the Comoros is KMF (CF), and a bill of quantities generated from your own drawings is priced in KMF using the DQE / DPGF standard.
What is being priced
The figures on this page price a granny flat in Comoros at 45 m² (484 ft²) of gross floor area over 1 storey, specified as self-contained one-bedroom annexe with kitchenette and shower room. Construction cost only — land, professional fees, statutory charges, utility connections and loose furniture are all excluded, and together commonly add another 15–30%.
Cost by specification level
| Specification | Construction cost (USD) |
|---|---|
| Basic / low-cost finish | $14,969 – $27,799 |
| Standard finish | $20,790 – $38,610 |
| Premium finish | $30,146 – $55,985 |
Where the money goes
Elemental split of construction cost for a granny flat of this type. Percentages are concept-stage cost-planning proportions; the ranges below apply them to the totals above.
| Element | Share | Cost (USD) |
|---|---|---|
Substructure & foundations Excavation, strip footings, hardcore, blinding, DPC and ground slab. | 15% | $3,119 – $5,792 |
Walling & superstructure Masonry, lintels, ring beam and any suspended floor. | 22% | $4,574 – $8,494 |
Roofing Trusses or rafters, covering, ceilings, fascia and rainwater goods. | 14% | $2,911 – $5,405 |
Internal finishes Plaster, screed, floor and wall tiling, ceilings and painting. | 18% | $3,742 – $6,950 |
Joinery & fittings Doors, windows, cupboards, worktops and ironmongery. | 9% | $1,871 – $3,475 |
Services (plumbing & electrical) Wiring, distribution board, fittings, water reticulation, sanitaryware and drainage. | 14% | $2,911 – $5,405 |
External works & preliminaries Site setup, supervision, paths, boundary works and connections. | 8% | $1,663 – $3,089 |
No drawings needed
Get a priced bill of quantities for your own house
The figures above are benchmarks for Comoros. Tell us how big your build is and get the itemised version — every material and trade measured and priced in KMF, — without needing architectural drawings.
Building granny flats in Comoros — frequently asked
How much does it cost to build a granny flat in the Comoros?
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Building a granny flat in the Comoros typically costs $20,790 to $38,610 in construction cost — roughly $462–$858 per m² ($43–$80 per ft²) over 45 m² (484 ft²) of floor area. That excludes land, professional fees and statutory charges. At a basic specification the same building lands nearer $14,969–$27,799; at a premium specification, $30,146–$55,985.
What is the cost per square metre in the Comoros?
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About $462–$858 per m² ($43–$80 per ft²) for this building type at a standard finish. Per-m² rates rise with storey height (frame, cores and cranage) and with specification, and fall on simple single-storey plans.
What is the biggest cost item?
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Walling & superstructure — about 22% of construction cost, or $4,574–$8,494 on this build. Masonry, lintels, ring beam and any suspended floor.
Does this include land, fees and furniture?
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No. These are construction costs only — materials, labour, plant and site preliminaries. Land, statutory approvals, professional fees, connections, landscaping and loose furniture are all additional, and together commonly add 15–30% on top.
How do I get an accurate figure for my own plans in the Comoros?
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Benchmarks give you the ballpark; a measured bill of quantities gives you the number. Upload your dimensioned floor plans to Enormous Buildings and get an itemised, source-cited BoQ in KMF in the DQE / DPGF format that the Comoros quantity surveyors and lenders expect — free to preview.
Why do build costs vary so much between countries?
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Three things dominate: labour cost, how much of the material basket is imported, and the code requirements the building must satisfy. The Comoros sits at index 33 against the United States at 100, which is why the figures above differ from what you'd see quoted for the same building elsewhere.
Other build costs in Comoros
For contractors & quantity surveyors
Tendering in Comoros every month?
A one-off bill suits a single project. If you tender regularly, a monthly plan brings the cost of each bill right down, with no card to re-enter each time.