The Cost Plan a Lender Will Accept for a Self-Build

A build budget written for a lender is a different document from one written for yourself. The lines it must carry, what moves each one, and the omissions that sink an application.

A lender funding a build is underwriting a forecast, so it reads your cost plan as a risk document. It is looking for stages it can certify against, a contingency that is real, professional and statutory costs that are usually left out, and a total that reconciles to the drawings and the programme. No figure here is a market cost: construction prices are quoted by contractors and suppliers and change constantly, and every line must be priced for your own project and confirmed at the time you build.

What this number does and does not include

This covers the cost of designing, approving and building, as a lender will want to see it, plus the finance costs that arise during construction. It excludes the land, which is either your equity contribution or a separate facility, and it excludes the running costs of the completed property.

Design and engineering fees

Architectural and engineering design, structural and services design, and the drawings a permit application and a contractor both depend on. A lender wants these complete, because a build priced from incomplete drawings will be repriced on site and the repricing has no funding behind it.

• Pushes it up: A complex or bespoke design, a difficult plot, and late changes that require redesign.
• Brings it down: A settled brief, a conventional layout, and design completed before tendering rather than during it.
• How to control it: Complete the design before you fix the budget, and treat redesign during construction as a cost rather than an adjustment.

Permits, approvals and statutory sign-offs

Building permit applications through the municipality, utility connection approvals, and the inspections and sign-offs required during and after construction, including civil defence approvals where the building type calls for them. These are gates as much as costs: work that proceeds without them creates a property that is hard to register and harder to finance.

• Pushes it up: A building type requiring more approvals, and any resubmission after a rejected application.
• Brings it down: A complete and compliant first submission, prepared by someone who files them regularly.
• How to control it: Confirm the current requirements through Balady and the relevant authorities before pricing the line.

Site preparation and substructure

Clearing, excavation, any retaining or shoring, soil improvement and the foundations. This is the part of a build least visible in the finished house and most capable of destroying a budget, because what is under the ground is only known once it has been investigated.

• Pushes it up: A sloped plot, poor ground conditions, a high water table, and the absence of a soil investigation.
• Brings it down: A soil investigation commissioned before the design is fixed, so the foundation design is priced rather than guessed.
• How to control it: Commission the soil investigation early and price the substructure from its findings, not from an allowance.

Structure and envelope

Frame, slabs, walls, roof, external finishes, windows and external doors. This is the largest block of cost and the one a certifier can most readily measure, which makes it the backbone of your drawdown schedule.

• Pushes it up: Long spans, heavy specification, complex geometry and imported envelope systems.
• Brings it down: A disciplined structural grid and specification decisions taken before tender rather than during construction.
• How to control it: Fix the specification in the contract documents so that later upgrades are visible as variations.

Services installations

Electrical, mechanical, plumbing, drainage, cooling and any low-voltage or smart systems. Services are where scope creeps most quietly, because each addition seems small and none of them appears on the drawings a contractor priced.

• Pushes it up: Added systems, upgraded cooling, solar or storage additions, and late decisions on fittings.
• Brings it down: A services specification agreed with the designer before tender, with allowances replaced by priced items.
• How to control it: Convert every allowance into a priced item before signing, and record any addition as a variation.

Internal finishes and fittings

Floors, walls, ceilings, joinery, sanitary ware, kitchens and built-in furniture. Lenders often fund these at a basic specification and treat upgrades as the owner’s concern, because the uplift they add to value is less reliable than their cost.

• Pushes it up: Specification upgrades, imported materials, and changes made once the space is visible.
• Brings it down: Selections made and priced before the build starts, with samples approved in advance.
• How to control it: Ask the lender what finish standard is funded and keep upgrades in a separate self-funded line.

Contingency

A sum held against the unknown rather than against the undecided. A lender reads a thin contingency as an incomplete budget, because every build encounters something, and the question is only whether it was provided for.

• Pushes it up: Nothing: it rises when you decide it should, which is the point of it.
• Brings it down: Better information, particularly a soil investigation, complete drawings and a firm specification.
• How to control it: Hold the contingency centrally, release it against written justification, and never spend it on upgrades.

Finance cost during construction

You pay for the facility while the house is unfinished and producing nothing, and on a staged facility the amount grows with each drawdown. Where you are also paying rent elsewhere, these two costs run in parallel and are the real price of a long programme.

• Pushes it up: A longer programme, early drawdowns, and any delay between stages.
• Brings it down: A tight programme, drawdowns taken when needed rather than when available, and no idle cash.
• How to control it: Model the finance cost for the planned programme and again for a programme several months longer.

Costs that never appear on the first page

• Utility connection charges and the cost of bringing services to a plot that has none.
• Temporary works, site security, hoarding and welfare that no drawing shows but every site needs.
• Contractor all risks cover during construction, which a lender will normally require in place before the first release.
• The certifier’s inspection cost at each drawdown, repeated if a stage is not ready when inspected.
• Rent or alternative accommodation for the months the programme runs beyond the plan.
• Testing, commissioning and the snagging work that falls between completion and occupation.

Keeping the budget honest

Price the plan twice: once from the design as drawn, and once at the programme you would face if the build ran materially longer, with the finance cost and your own accommodation recalculated. If the second version breaks you, the project is underfunded regardless of how sound the first looks. Keep the contingency visible as its own line so that spending it is a decision somebody has to justify. Construction prices and statutory requirements both move, so confirm every line with contractors, suppliers and the relevant authorities at the time you commit.

• After the soil investigation, when the substructure can be priced rather than estimated.
• After tender returns, when allowances should be replaced by priced items.
• At each drawdown, reconciling certified value against the cost plan rather than against invoices.
• Whenever a variation is instructed, with its funding source identified before the work starts.
• At practical completion, reconciling the whole plan before retention is released.

Domira works alongside the finance side of a property purchase or a build: the valuation evidence, the cost plan and the construction programme that a lender needs to see. The lending terms come from your bank or finance company, and Domira makes sure the property side of the file stands up.