Renovation budget control on a flip: plan, actuals and change orders

Renovation budget control in an investment project rests on three documents: an estimate approved before purchase (the plan), a regular report on completed work tied to that estimate's line items (the actuals), and written approval of every change before it happens. On DNPI Capital's completed Compte de Urgel project, the renovation cost €76,230 against a €410,000 purchase price, almost a fifth of it. At that weight, any deviation from the plan changes the investor's result directly.

Why renovation is the one line you can actually manage in a flip

In a buy-renovate-sell deal, most budget lines are fixed at the moment of purchase and don't move afterward: the property price, the ITP transfer tax, the notary, registration. The sale price depends on the market at exit, and there's limited room to influence it. Renovation is the one major line that takes shape after the purchase, and the one the investor and the project sponsor can influence directly.

Take the completed Compte de Urgel project and its confirmed figures: purchase €410,000, renovation €76,230, sale €720,000. The gap between the sale price and the purchase-plus-renovation cost is €233,770, before entry and exit taxes, closing costs, permit fees and the holding period. Had the renovation run over budget, every euro of overrun would have cut into that gap one for one, and into the investor's share under the 50/50 split by half, with the other half falling on the sponsor. For more on the deal itself, see the Compte de Urgel case study; for the full cost structure of a deal, see the investor guide.

The plan: what the estimate must cover before you buy

The renovation estimate on an investment project is built before the purchase, not after: without it there's no way to tell whether the deal clears the target return. It is built section by section, and each section carries its own source of uncertainty.

Mistakes in the plan happen most often in three spots.

Cost per square metre benchmark

Barcelona contractors publish full-renovation benchmarks in the range of €500–1,400/m² depending on finish level: basic €400–500/m², mid-to-high €600–800, premium from €800 (Cubicup, ArqPro, Selarom). These are contractor marketing figures, not statistics, and they typically exclude the project, permit and VAT. In an investment estimate they're useful only as an order-of-magnitude check. The final number comes from the contractor's estimate for the specific property after a site survey.

VAT rate on the works: why investors pay 21%

The reduced 10% VAT rate on home renovation applies only when three conditions are met at once: the recipient of the works is an individual using the property for their own private use (it does not have to be their main home, but it cannot be let out or used for business); the property was built or rehabilitated more than two years ago; and the contractor's materials don't exceed 40% of the work's tax base (Agencia Tributaria). An investment project where the client is a company doesn't meet the first condition, so the plan is built on 21% instead. An estimate run at 10% understates the works budget by 11 percentage points before renovation even starts. Whether the rate applies to a specific deal structure is worth confirming with a tax advisor.

Permit type and timeline

The third spot is the permit type. It determines the fee, and also how long the investor's capital sits tied up in the property. Per Barcelona city hall (Ajuntament de Barcelona):

• an assabentat notification lets work start the day after filing, with a 3-month limit on the works;
• a comunicat diferit is reviewed by the municipality for 1 month and allows 6 months to complete;
• a llicència d'obres majors takes 2 months to review, or 3 months if a fire-safety or heritage report is required.

A comunicat diferit also requires an Informe d'Idoneïtat Tècnica, which takes roughly 20–30 days to prepare (3linies). If the permit type changes after the site survey, the whole project calendar changes with it.

The actuals: how completed work is tracked

Renovation on DNPI Capital projects is carried out by BCNYARD, SLU, an independent construction company working under a contractor agreement. Tracking actuals follows standard Spanish construction practice: the contractor periodically issues a certificación de obra, a certificate for completed volumes in which each line is tied to a line in the approved estimate.

To keep control, the investor needs four figures for every section of the estimate:

• plan: the amount approved before work started;
• completed: the value of work accepted by certificate as of the report date;
• paid: what's actually been disbursed to the contractor;
• forecast to completion: what's still needed, including changes already approved.

The gap between "paid" and "completed" shows whether payment is running ahead of the work. The gap between "plan" and "forecast to completion" is the current budget deviation, and it needs to be watched before the percentage of completion, because a property can be half-finished while two-thirds of the budget is already spent.

The investor receives a report with these four columns, the remaining reserve and a list of open questions on a regular basis, not at the end of the project. How the project stages and investor communication are structured is set out in DNPI Capital's approach.

Change orders: three types, one rule

Changes during renovation are unavoidable. The problem isn't the changes themselves but changes that never went through the approval process. By source, they fall into three types.

Hidden defects. Found during demolition: the condition of floor slabs, risers, damp, old wiring. This is a risk of the property itself, and it's exactly what the contingency reserve is for. A pre-purchase survey lowers the odds: legal and technical due diligence catches some of these issues early, though not all of them.

Decision changes. The investor or the sponsor decides to change the layout, raise the finish level or swap out fixtures. That's a deliberate choice, and it should come with an answer to one question: will it add more to the sale price than the change itself costs?

External requirements. Municipal comments on the permit, comunidad de propietarios requirements, inspection orders. These can't be influenced, but some can be anticipated at the planning stage.

The rule is the same for all three types: no change is carried out before written approval. The approval form is a short document with five fields: description, cause, cost including VAT, schedule impact, and funding source (reserve or additional contribution). Verbal approval on site is the single most common reason for a gap between what an investor expects and the final invoice.

The contingency reserve is built into the estimate as a separate line, and its size is agreed when the plan is approved. It depends on the building's age, how thorough the pre-purchase technical survey was and the scope of demolition. What matters isn't the number so much as the discipline: the reserve is spent only through the same approval procedure, and its remaining balance is visible in every report.

How budget overruns affect investor returns

Under DNPI Capital's model, project profit is split 50/50 between the investor and the sponsor. A budget overrun cuts into both sides' results: every €10,000 over plan means minus €10,000 in the project's profit and minus €5,000 in each party's share. Since an overrun reduces the sponsor's share by the same amount, the sponsor has the same interest in controlling the budget as the investor does.

The agreement also provides for compensation from DNPI's fee if the investor's return after distribution falls short of 10% over the life of the project (not annualized). That's a contractual term, not a guaranteed outcome: it caps part of the risk but doesn't remove it. The sale price and the timeline still depend on the market at exit, the permit and how the works go, and the result of one completed project doesn't predict the next.

You can model how a change in the renovation line affects the outcome in the deal calculator, which works out the ITP, renovation, sale costs and the investor's share. The overall strategy is covered on the buy-renovate-sell page.

Investor checklist before approving the estimate

Before you sign off the estimate, make sure that:

• The estimate is broken down by section, with m² volumes and item counts, not a single lump sum.
• The VAT rate in the estimate matches the deal structure: 21% for a corporate client.
• Project, permit and fees are listed as separate line items, with the permit type specified.
• The contingency reserve is a separate line item with a defined spending procedure.
• The contractor agreement ties payment to work accepted by certificate, not to the calendar.
• The change-order approval form is defined, along with who signs it on each side.
• The reporting cadence for "plan – completed – paid – forecast to completion" is agreed.