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Costs missing from a prefabricated home price: how to complete the budget

A review of studies, site works, transport, connections, finishes and timing that prevents comparison of different scopes.

6 min readEditorial review · Colombia; specific application depends on the municipality, parcel, project and competent authority.
LoteMedellin
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THIS GUIDE, IN VIDEOSpanish audio · Spanish subtitles · 2:31

Casa prefabricada: completa el presupuesto

Watch the explanation and read its transcript on Casa prefabricada: completa el presupuesto. To continue your review, also read Vivienda prefabricada: permisos antes de comprar el módulo and Contrato de obra prefabricada: alcance, pagos, cambios y entrega.

Video, transcript and related reading
THE MAIN POINT

An unknown cost needs a task and responsible person; entering zero creates a misleadingly complete budget.

01

Define the state the budget must reach

Before adding items, describe what delivered home means to you: dispatched components, assembled structure or a project with agreed installations and finishes. Our editorial proposal fixes that common state and separates matters still requiring definition. Law 1480 addresses understandable information within its scope; requesting inclusions and exclusions prevents interpretation of a catalogue price as the complete cost. No universal overrun percentage is proposed here. Prepare columns for included, quoted separately and unknown, referencing offers and dates. If a supplier uses another handover definition, translate it into the same table before comparison. Distinguish land purchase spending from expenditure necessary to develop the project as well. The budget should explain the result achieved by each payment and its remaining dependencies instead of displaying one apparently precise figure concealing tasks without an established scope or responsible person for their completion.

Check this section against the sourcesCancillería: Ley 1480 de 2011
02

Allow for preliminary information and design

Connect available studies with the current brief and ask the team what is missing. Surveying, subsurface investigation and design are not interchangeable budget items. NSR-10 Title H links geotechnical studies with the project; an older document may need relevance review before use. Our sheet records scope, professional and deliverable rather than buying a report by name without knowing which decision it addresses. Separate initial guidance from later phase work where relevant without assuming a preliminary consultation removes future needs. If design is included, ask which disciplines and coordination it covers. A gap can arise where the manufacturer supplies only system information and nobody integrates site conditions. Mark that assignment pending and obtain an appropriate proposal. Budgeting for sufficient information reduces improvisation but guarantees neither favourable findings nor replacement of authority responses concerning the intended project and its applicable requirements.

Check this section against the sourcesNSR-10 Título H, copia oficial IDRD
03

Separate transport, unloading and storage

Request pricing for the actual route and delivery location, identifying included operations. Our comparison separates factory departure, arrival in the area, entry onto the parcel and placement for assembly. Do not assume a short distance removes access difficulties. In a hypothetical scenario, the carrier needs another component transfer and temporary storage absent from the initial offer. Record who assesses them and their budget and timing effects. Ask what happens if the site is unprepared on the agreed date, leaving contractual conditions to legal advice. Law 1480's information framework supports understandable costs and exclusions where applicable. Avoid inventing a charge per kilometre or universal permissions rule to fill the table. A pending item needs logistics assessment rather than an optimistic number allowing the total to be closed before the actual scope is understood for the site and proposed delivery.

Check this section against the sourcesCancillería: Ley 1480 de 2011
04

Budget site works with a technical scope

Ask the team to define preliminary works needed by the proposal without deducing foundations from the home's material. Title H addresses subsurface conditions and project related recommendations; this article prescribes neither excavation, retaining structures nor a universal base. Our sheet separates investigation, design and execution of works eventually defined. Ask who receives the result and how it coordinates with assembly. If a quotation excludes earthworks, do not assume they are minor merely from the label. Avoid double counting preparation included elsewhere as well. A professional should explain which information enables pricing and which assumption could change. When comparing parcels, record differences in uncertainty without producing an improvised appraisal. The decision may be to investigate an option before proceeding or reconsider preliminary siting if required works do not fit the available budget and timetable for the proposed home.

Check this section against the sourcesNSR-10 Título H, copia oficial IDRD
05

Include the operation the structure needs

An assembled home does not automatically answer how water and electricity arrive or how sanitation is assessed. EPM distinguishes service connection processes; request location and brief specific responses while separating a nearby network from an approved condition. Our matrix allocates external connection, private installations and additional equipment where defined. A nearby pipe or pole should not make a budget item disappear by assumption. Ask who coordinates the delivery point with design and what documentation is missing. If an autonomous alternative is proposed, include assessment, operation and replacement rather than only the principal equipment purchase. Occasional use can differ from permanent residence; compare the same scenario. The figure should explain what operates under the agreed scope and what needs later commissioning. Mark unknown where evidence is insufficient instead of converting the gap into savings existing only inside a spreadsheet and unsupported by a provider response.

06

Review finishes and equipment item by item

Request descriptions of elements affecting use and equivalence: enclosure, surfaces, internal installations and agreed equipment. Our record avoids assuming two offers labelled complete include the same things. Consumer information principles support clear specifications and conditions where relevant, while the particular selection remains your decision. Separate optional upgrades from components necessary to the defined delivery state. If materials change after commissioning, request scope, price and timing effects before acceptance. Do not treat a reference photograph and a contractual list as equivalent evidence. Ask about care instructions and foreseeable operating expenses the supplier can document. A budget can retain future choices as options without adding every option to the basic project or hiding missing decisions. The useful result explains what each version purchases and how modifications are communicated, preventing different expectations when the home is received under the chosen commercial scope.

Check this section against the sourcesCancillería: Ley 1480 de 2011
07

Connect timing and cash without invented contingencies

Order payments around tasks and results: preliminary information, preparation, fabrication and delivery under the defined scope. Our editorial proposal shows money needed before using the home and personal expenses that might arise if timing changes. It sets no contingency percentage valid for every project. Ask the team which items remain uncertain and which scenarios can be documented. Distinguish possible delay from established delay and review contractual change treatment with the lawyer. Mark quotations for updating if they expire before the expected phase. Record coordination or visit costs actually offered rather than charging twice for included management. The purpose is to identify which investigation most reduces uncertainty before the next commitment. A sum with every field filled can be less reliable than an honest budget showing dependencies and assigning a concrete task to resolve each important gap for the intended programme.

08

Compare two offers to the same result

Imagine one components offer and another including assembly. The first appears cheaper but logistics and execution remain to be commissioned; the second excludes site works and connections. Our table brings both to the agreed state, assigning responsibility and evidence to every item. Do not invent amounts to produce an immediate winner. Request additional quotations where scope exists and identify investigation where it does not. Supplier information, studies and utility responses serve different functions and need connecting. If a favourite works only by assuming all outstanding items will be cheap and quick, the advantage remains uncertain. A revised scope, different parcel or adjusted programme may be appropriate. A decision ready budget promises no absence of surprises; it shows what is known and which commitments still depend on responses needed before further spending on the intended home and its site.

FROM READING TO YOUR DOSSIER

Two fictional quotations for an equivalent result

Invented amounts in millions of COP, without current supplier prices. Comparison targets a home with the same scope; pending items prevent a final total or automatic selection of the lower headline figure.

Item to equaliseFictional quotation AFictional quotation B
Components and finish80: components according to a received list. Check which finishes are missing from the desired outcome.110: described components and assembly. Compare specifications before assuming equivalence.
Assembly12 assumed additional cost; scope to confirm with the responsible supplier.Included in 110 only under the described fictional scope; do not count twice.
Transport and unloading5 assumed; route, vehicle and manoeuvres still require assessment.5 assumed additional cost on the same route; ask whether unloading and equipment are included.
Foundations and preparationUnquoted. Do not replace with zero or use a solution from another site.Unquoted and outside the assumed scope. Requires project and site information.
Utilities, external works and studiesPending: identify responsibilities, deliverables and quotations needed to use the home.Pending under the same criteria. A broader offer does not automatically complete these items.
Subtotal and decision80 + 12 + 5 = 97 known in the example, plus pending items and possible scope differences.110 + 5 = 115 known in the example. Compare totals only after matching scope and quoting exclusions.
Open my dossier
Cancillería: Ley 1480 de 2011NSR-10 Título H, copia oficial IDRDEPM: aguas para constructor y urbanizador
DOCUMENTS FOR FURTHER READING

Sources & bibliography

Read the full document, its date, amendments and scope. The editorial review date describes this page; it does not establish an authorisation or a specific answer about your plot or financing.

  1. 01Cancillería: Ley 1480 de 2011www.cancilleria.gov.co · Articles 23, 24, 29 and 30: information and advertising in consumer relationships; applicability to an individual case needs review.
  2. 02NSR-10 Título H, copia oficial IDRDwww.idrd.gov.co · Geotechnical investigations and their relationship to the project; check applicable amendments. No investigation methods or quantities are prescribed here.
  3. 03EPM: aguas para constructor y urbanizadorwww.epm.com.co · Feasibility-to-connection process and geoportal; they do not establish availability for an individual property.
  4. 04EPM: energía para constructor y urbanizadorwww.epm.com.co · Official information on connection applications and support for electricity projects; scope depends on coverage and the provider's response.
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