Six-Month Build Math: Lost-Rent Calculator for Small Apartments (Download)

published on 04 September 2025

Delays in construction can cost you thousands of dollars in lost rent and extra expenses. If your small apartment project takes longer than planned, you’re not just losing rental income - you’re also paying ongoing financing, taxes, and insurance costs. For example, a fourplex in Nova Scotia delayed by six months could lead to $73,200 in combined losses.

To help, the Lost-Rent Calculator estimates the financial impact of delays. Input your project details - monthly rent, unit count, and delay length - to see how much you stand to lose. This tool emphasizes the importance of sticking to a fixed construction timeline to protect your investment.

Key Points:

  • Lost Rent Example: A fourplex delayed by 3 months loses ~$36,600.
  • Carrying Costs: Financing, taxes, and insurance add thousands more.
  • 8-Unit Impact: An 8-month delay can cost $189,600 - nearly the price of a new unit.
  • Solution: Helio offers a 6-month build guarantee with fixed pricing and penalties for delays.

Use the calculator to make informed decisions, avoid delays, and keep your rental income on track.

Calculating Lost Rent: How Delays Affect Your Bottom Line

Monthly Income Loss Breakdown

Let’s take a typical fourplex in Nova Scotia as an example. Such a property can generate about CA$8,100 in monthly rental income. If construction stretches beyond the planned six-month timeline, every extra month of delay means you lose this entire amount.

For instance, imagine a fourplex scheduled for completion in March 2025. If delays push the finish date to June 2025, that three-month delay would result in CA$24,300 in lost rental income. These losses represent revenue you’ll never recover.

Now consider an 8-unit building that brings in CA$16,200 per month. A similar three-month delay would lead to CA$48,600 in lost income. These numbers highlight why sticking to a reliable construction schedule is critical.

Additional Costs from Delays

Lost rent is just one piece of the puzzle. Construction delays also pile on extra carrying costs. For a CA$640,000 fourplex project, with financing rates hovering around 7–8%, monthly interest payments could be around CA$3,500. Add to that property taxes, which might range from CA$400 to CA$600 per month, and the financial burden grows quickly.

Over a three-month delay, these carrying costs alone could total anywhere from CA$12,300 to CA$15,600, adding to the financial strain beyond the missed rental income.

Lost Rent Examples by Delay Length

Here’s a breakdown of total losses based on project size and delay duration:

Project Size 1‑Month Delay 3‑Month Delay 6‑Month Delay
4‑Unit Building CA$8,100 lost rent + CA$4,100 carrying costs = CA$12,200 CA$24,300 lost rent + CA$12,300 carrying costs = CA$36,600 CA$48,600 lost rent + CA$24,600 carrying costs = CA$73,200
6‑Unit Building CA$12,150 lost rent + CA$5,800 carrying costs = CA$17,950 CA$36,450 lost rent + CA$17,400 carrying costs = CA$53,850 CA$72,900 lost rent + CA$34,800 carrying costs = CA$107,700
8‑Unit Building CA$16,200 lost rent + CA$7,500 carrying costs = CA$23,700 CA$48,600 lost rent + CA$22,500 carrying costs = CA$71,100 CA$97,200 lost rent + CA$45,000 carrying costs = CA$142,200

These calculations assume a CA$2,025 monthly rent per unit and include financing, taxes, and insurance. For example, a six-month delay on an 8-unit project could result in CA$142,200 in combined losses. That’s nearly the cost of building another unit based on Helio’s pricing of CA$160,000 per unit.

Delays often stem from traditional fragmented construction methods, where architects, engineers, and contractors work independently. This lack of coordination can lead to miscommunication, extended timelines, and ballooning costs.

How to Use the Lost-Rent Calculator

Lost-Rent Calculator

Step-by-Step Instructions

Construction delays can quickly escalate costs, especially in fragmented project models. To help quantify these impacts, Helio offers a Lost-Rent Calculator - a simple tool available as an Excel spreadsheet or for use in Google Sheets. You can download it directly from Helio's website without needing to provide personal details or sign up for any mailing lists.

Once you've downloaded the file, open it in either Excel or Google Sheets. The calculator is designed to be user-friendly, with clearly labelled, colour-coded fields to guide you through the process.

Here’s what you’ll need to do:

  • Enter your monthly rent per unit: Use the current market rate in your area. For properties in Nova Scotia, input the local market rate.
  • Input the total number of units in your project: Whether you’re building a small fourplex or a larger 12-unit property, the calculator works for any project size.
  • Specify the delay duration in months: This is the number of months your project is expected to extend beyond its original timeline. You can adjust this number to explore various scenarios and their financial implications.

By following these steps, you’ll have all the necessary data to calculate the impact of delays on your project.

What to Enter and What You'll Get

The calculator is straightforward. You’ll input three key details:

  1. Your monthly market rent per unit.
  2. The total number of units in your building.
  3. The delay duration in months.

Once entered, the tool calculates several important figures, including total lost rent, carrying costs, overall financial impact, and even a breakdown of losses per day.

If your project includes mixed-unit buildings with varying rental rates, it’s best to use an average rent figure for all units.

The delay duration field is particularly useful for testing different scenarios. For instance, input delays of 1, 3, 6, or even 12 months to see how costs stack up over time. This feature helps you understand the financial risk of working with contractors who can’t stick to a timeline.

The results include:

  • Total lost rent: The income you miss out on during delays.
  • Estimated carrying costs: Additional expenses incurred during the extended timeline.
  • Overall financial impact: A combination of lost rent and carrying costs, including a per-day loss figure for better clarity.

For example, an 8-unit project could lose around CA$540 per day during delays. When compared to Helio’s daily penalty of up to CA$1,000, it’s clear how delays can quickly outweigh typical penalties.

Lost Rent Comparison Table

Here’s a breakdown of potential losses for various project types and delay durations:

Project Type 2-Month Delay 4-Month Delay 8-Month Delay
4-Unit Building CA$16,200 lost rent + CA$8,200 carrying costs = CA$24,400 CA$32,400 lost rent + CA$16,400 carrying costs = CA$48,800 CA$64,800 lost rent + CA$32,800 carrying costs = CA$97,600
6-Unit Building CA$24,300 lost rent + CA$11,600 carrying costs = CA$35,900 CA$48,600 lost rent + CA$23,200 carrying costs = CA$71,800 CA$97,200 lost rent + CA$46,400 carrying costs = CA$143,600
8-Unit Building CA$32,400 lost rent + CA$15,000 carrying costs = CA$47,400 CA$64,800 lost rent + CA$30,000 carrying costs = CA$94,800 CA$129,600 lost rent + CA$60,000 carrying costs = CA$189,600

For an 8-unit project, assuming a monthly rent of CA$2,025 per unit, an 8-month delay could cost nearly CA$190,000 - roughly the price of adding another unit to your building.

The calculator also highlights the opportunity cost of delays. That CA$190,000 loss represents rental income you’ll never recover, even after the building is complete. This is a common issue in traditional construction models, where multiple contractors work independently, often leading to extended delays. Helio’s fixed timeline approach avoids these pitfalls, ensuring your project stays on track and minimizing financial losses.

How to calculate the Cost of Delay

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Fragmented Construction vs Helio's 6-Month Build Model

This section compares the traditional fragmented construction model with Helio's streamlined approach, focusing on the benefits of fixed build timelines.

Problems with Fragmented Construction

The traditional Design-Bid-Build method often creates significant headaches for property owners developing small apartment projects. Just the process of procurement can add over six months to timelines [1]. With separate contracts for the owner, designer, and contractor, accountability is scattered, making it harder to resolve delays efficiently.

Cost overruns are another common issue. Since contractors typically join the project only after the design phase is complete, unexpected problems often lead to expensive change orders. These can inflate costs by 30–60% beyond the original budget. On top of that, the lack of coordination between separate teams introduces timeline uncertainty, as delays pile up due to poor communication and fragmented workflows.

The Helio Advantage: Fixed Timelines

Helio eliminates these challenges with its integrated design-build model. By bringing planners, architects, engineers, and construction crews under one roof, Helio ensures a single point of accountability throughout the project. This approach allows Helio to offer a fixed six-month construction guarantee, with financial penalties of up to CA$1,000 per day if deadlines are missed. Since the same team handles both design and construction, miscommunication and costly change orders become a thing of the past.

Helio also provides fixed pricing at CA$160,000 per unit, so you’ll know your exact costs before breaking ground. This clarity helps property owners avoid surprise expenses and saves an average of CA$47,000 in coordination inefficiencies. Daily photo updates keep you informed of progress, ensuring full transparency. With this seamless process, rental income begins as scheduled, protecting your investment.

Comparison Table: Fragmented vs Helio

Here’s a quick look at how Helio stacks up against the traditional fragmented model:

Factor Fragmented Construction Helio's Integrated Model
Timeline Predictability 12–18 months typical; procurement alone takes 6+ months Fixed 6‑month guarantee with financial penalties
Cost Certainty Frequent change orders lead to 30–60% overruns Fixed pricing with no surprise costs
Accountability Multiple contracts create fragmented accountability Single contract with one accountable team
Lost Rent Risk High - delays are common Low - guaranteed timeline protects rental income
Coordination Independent teams complicate coordination Integrated team works seamlessly together
Quality Control Varies by contractor with limited oversight Regular inspections and a 2‑year warranty
Communication Updates often scattered across teams Daily photo updates and a single point of contact

The financial impact of delays becomes clear when you use the Lost-Rent Calculator. For example, an 8-unit project delayed by 8 months under a fragmented model could cost nearly CA$190,000 in lost rental income and carrying costs. With Helio's guaranteed timeline, you’ll start collecting the expected CA$16,200 in monthly rental income on time.

Conclusion: Protecting Your Rental Income with Fixed Builds

Key Points for Property Owners

Construction delays can hit your rental income hard. For example, a delayed 4-unit building in Nova Scotia could cost you approximately CA$8,100 per month (4 units × CA$2,025/month). Instead of leaving your project at the mercy of unpredictable timelines, it's essential to calculate the cumulative income losses that delays can bring, as these losses grow month by month.

Tools like the Lost-Rent Calculator make it easier to see the financial impact clearly. This insight allows you to make smarter decisions when selecting a builder and negotiating contract terms. While documenting losses might help with tax deductions, avoiding delays altogether is the real win.

At the heart of it, avoiding these losses comes down to working with builders who prioritize reliable construction practices.

Why Helio's Model Works

When you break down the numbers, it’s easy to see why traditional construction methods often fall short. Roughly 60% of Canadian multi-residential projects face delays, with setbacks averaging 3–6 months [Altus Group, 2023].

Helio’s approach eliminates this uncertainty. Their six-month construction guarantee, backed by financial penalties of up to CA$1,000 per day for delays, ensures your rental income stays on track. On top of that, fixed pricing means no surprise costs - preventing budget overruns that can inflate expenses by 30–60%.

By integrating design and construction teams under one contract, Helio keeps projects on schedule and within budget. This collaboration resolves issues quickly and establishes clear accountability. For property owners, this means collecting your expected monthly rent - CA$1,950–CA$2,100 per unit - on time, resulting in an annual ROI of 12% to 20%.

If predictable rental income is your priority, the decision is straightforward: stick with traditional methods and risk delays and cost overruns, or choose Helio for fixed timelines, guaranteed outcomes, and peace of mind from day one.

FAQs

How does the Lost-Rent Calculator handle differences in rental rates across various regions?

The Lost-Rent Calculator takes into account regional rental variations by incorporating local market data. It compares the rent you plan to charge with the average market rent in your area. This approach ensures the estimates align with the specific rental conditions in your region, giving you a clear picture of potential income loss caused by construction delays.

What makes Helio's design-build model better than traditional construction methods for small apartment projects?

Helio’s design-build model simplifies the construction process by merging design and building into a single, unified approach. This means fewer contracts to juggle and fewer delays, helping keep your project on track and within budget.

This integrated approach encourages better teamwork, keeps costs more predictable, and speeds up timelines. Unlike the traditional, often disjointed construction process, Helio’s method reduces uncertainties, giving you a clearer and faster route to start earning rental income.

What can property owners do to reduce the financial impact of construction delays, even when using the Lost-Rent Calculator?

To lessen the financial strain caused by construction delays, property owners can take practical steps like ensuring they have thorough insurance coverage and setting aside financial reserves to handle unexpected expenses. These precautions act as a safety cushion for unforeseen setbacks.

On top of that, using effective project management strategies - such as acceleration methods and delay recovery plans - can help keep the project moving on schedule. Being prepared and responding to delays promptly allows property owners to reduce disruptions and protect their potential rental income.

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