Selecting the right window company for your home renovation can be overwhelming with so many options available in London. Whether you’re looking to replace old windows, upgrade to energy-efficient models, or install new designs, choosing a reliable service provider is crucial for achieving high-quality results with minimal disruption to your daily life. This guide evaluates the top window companies in London to help you make an informed decision for your next home improvement project.
How We Evaluated These Companies
Our comprehensive assessment of window companies in London incorporates multiple factors to provide you with trustworthy recommendations:
- Customer Satisfaction: We analyzed genuine reviews on Homestars and Google Ratings to gauge customer experiences
- Product Offerings: We examined the breadth of available options, from traditional casement windows to modern designs
- Pricing Transparency: We compared price levels across various window types and installation services
- Warranties: We evaluated the comprehensiveness and duration of warranties offered
- Energy Efficiency Ratings: We assessed energy performance certifications including ENERGY STAR Certified ratings
- Industry Experience: We considered years in business and demonstrated expertise
Installation Quality: We reviewed feedback regarding installation teams and service quality
Comparison Table: Top Window Companies in London
| Company | Homestars Rating | Google Rating | Price Range | Warranty | ENERGY STAR Certified |
| 1. Total Home Windows and Doors | 5.0/5 | 5.0/5 | $-$$ | Lifetime | Yes |
| 2. Heritage Renovations | 4.9/5 | 4.8/5 | $$-$$ | 25 Years | Yes |
| 3. Centennial Windows & Doors | 4.8/5 | 4.7/5 | $-$$ | Limited Lifetime | Yes |
| 4. Landmark Windows & Doors | 4.2 (420 reviews) | 3.3 (337 reviews) | $ | 10 years | Yes |
| 5. Golden Windows | 4.6/5 | 4.5/5 | $-$$ | 20 Years | Yes |
Customer Feedback Summary
Below is a summary of actual customer feedback themes for each company, highlighting what real customers consistently mention in their reviews:
| Company | Installation Quality | Customer Service | Product Quality | Value for Money | Timeline & Reliability |
| Total Home Windows and Doors | ★★★★★"Flawless installation" | ★★★★★"Responsive and knowledgeable" | ★★★★★"Superior quality windows" | ★★★★★"Worth every penny" | ★★★★★"On-time, as promised" |
| Heritage Renovations | ★★★★★"Meticulous attention to detail" | ★★★★★"Excellent from start to finish" | ★★★★★"Exceptional craftsmanship" | ★★★☆☆"Premium price but quality shows" | ★★★★☆"Occasionally delayed but worth waiting" |
| Centennial Windows & Doors | ★★★★☆"Professional installation team" | ★★★★☆"Good follow-up service" | ★★★★★"Well-made Canadian windows" | ★★★★☆"Good quality for the price" | ★★★★☆"Generally reliable timelines" |
| Landmark Windows & Doors | ★★★★☆"Efficient and tidy workers" | ★★★★☆"Friendly, no-pressure approach" | ★★★★☆"Good quality for budget windows" | ★★★★★"Excellent value for money" | ★★★★☆"Quick installation process" |
| Golden Windows | ★★★★☆"Skilled with custom installations" | ★★★★☆"Knowledgeable consultants" | ★★★★★"Beautiful, well-crafted windows" | ★★★☆☆"Higher priced but unique options" | ★★★☆☆"Custom work takes longer than estimated" |
Certifications and Awards
Industry certifications and awards provide additional assurance of quality and reliability. Here’s how each company stands in terms of recognized achievements:
| Company | Energy Certifications | Industry Associations | Quality Certifications | Notable Awards | Environmental Credentials |
| Total Home Windows and Doors | ENERGY STAR Certified 2025NAFS-11 Compliance | Window WiseSAWDAC | CSA CertifiedNFRC Listed | Homestars Best of the Best 2025 (4x winner)Homestars Best of Awards 2024 (6x winner)Baumler ApprovedThree Best Rated | GreenGuard Certified MaterialsSustainable Manufacturing Practices |
| Heritage Renovations | ENERGY STAR CertifiedNAFS-11 Compliance | SAWDACCWDMA | CSA Certified | Homestars Best of 2023London Home Builders' Association Award | Energy Efficiency ExcellenceWaste Reduction Program |
| Centennial Windows & Doors | ENERGY STAR CertifiedR-Factor Rated | Window WiseSAWDAC | ISO 9001:2015CSA Certified | Consumer Choice Award (3x)London Chamber Distinction | Recycled Material UsageEnergy Efficient Operations |
| Landmark Windows & Doors | ENERGY STAR Certified | SAWDAC | CSA Certified | Homestars Best of 2024Community Choice Award | Low VOC Materials |
| Golden Windows | ENERGY STAR CertifiedNAFS-11 Compliance | CWDMAIGMA | CSA CertifiedAAMA Certified | Architectural Design ExcellenceHeritage Preservation Award | Sustainable Forestry CertifiedLow Carbon Footprint |
1. Total Home Windows and Doors: Engineering Excellence Meets Customer Service
Website: thwindowsdoors.com
Key Features
Total Home Windows and Doors stands out as an engineering-focused window manufacturer with a unique approach to window design and installation. Founded by co-owners with strong engineering backgrounds, the company has transformed from a small startup to a leading manufacturer producing 17,000 windows annually. Their fully automated production process utilizes state-of-the-art equipment including Pro-Line machines for vinyl and Cardinal Glass for superior glass components.
What truly distinguishes Total Home is their innovative product development. Their exclusive Slim Flat Profile 2.78 window features a profile that’s half an inch slimmer on each side, creating a sleek, modern aesthetic while maintaining structural integrity. Their patented Total Seal Lock System provides enhanced security through multi-point locking mechanisms that eliminate weak points in window corners—a common vulnerability in standard window designs.
Product Range
Pros
Cons
Price Level
$$-$$$ (Mid to Upper-Mid Range)
Conclusion
Total Home Windows and Doors delivers exceptional value through engineering-driven innovations and quality craftsmanship. With perfect 5.0/5 ratings on both Homestars and Google, plus multiple industry awards including Homestars Best of the Best 2025 (winner 4 times), they’ve established themselves as the gold standard in the London window market. Their lifetime warranty and competitive pricing for premium features make them an excellent choice for discerning homeowners seeking the perfect balance of quality, aesthetics, and long-term value.
2. Heritage Renovations: Family-Operated Excellence
Key Features
Heritage Renovations has built a strong reputation as a family-operated window company serving London and surrounding areas for over two decades. Their approach emphasizes personalized service from initial consultation through installation and beyond. The company specializes in energy-efficient window solutions that are specifically designed for Canadian climate conditions, helping homeowners significantly reduce their energy bills while enhancing home comfort.
Their consultation process includes a thorough home assessment to determine the optimal window styles and materials for each unique situation. Heritage employs installation teams comprised of full-time, trained professionals rather than subcontractors, ensuring consistent quality and accountability. Their installation process focuses on proper insulation and sealing techniques that prevent thermal bridges and maximize energy performance.
Product Range
- Double glazed and triple glazed windows
- Vinyl windows with UPVC frames
- Traditional casement windows
- Bay and bow windows
- Picture windows
- Sliding windows
- Double-hung windows
- Custom shapes and sizes
- Entry doors and patio doors
- Garden doors
Pros
Cons
Price Level
$$$-$$$$ (Premium)
Conclusion
Heritage Renovations justifies its premium pricing with exceptional craftsmanship and service, reflected in their outstanding 4.9/5 Homestars and 4.8/5 Google ratings. Their specialization in energy-efficient windows results in significant long-term savings for homeowners through reduced energy bills. For those willing to invest in quality and service excellence, Heritage delivers reliable results backed by one of the strongest warranties in the industry.
3. Centennial Windows & Doors: Manufacturing Heritage
Key Features
Centennial Windows & Doors has established itself as a trusted name with manufacturing facilities located right in London, Ontario. With over 35 years of industry experience, they’ve built a reputation for combining Canadian manufacturing with innovative window technologies. Their in-house production capabilities allow for tighter quality control and more customization options than companies that simply install third-party products.
Their manufacturing approach focuses on creating windows specifically designed for Canadian climate extremes. All windows feature fusion-welded corners, multi-chamber designs for added insulation, and specialized glass packages that enhance thermal efficiency. Their installation process includes a proprietary “Perfect Fit” measurement system that ensures each window is manufactured to within 1/8″ of the opening, minimizing the need for additional insulation and reducing the potential for air leakage.
Product Range
- ENERGY STAR Certified windows
- Double and triple glazed options
- Custom bay and bow configurations
- Casement windows
- Slider windows
- Awning windows
- Picture windows
- Security-enhanced entry doors
- Patio doors with reinforced frames
- Specialty shape windows
Pros
Cons
Price Level
$$-$$$ (Mid to Upper-Mid Range)
Conclusion
Centennial Windows & Doors offers an excellent balance of quality and value, reflected in their strong 4.8/5 Homestars and 4.7/5 Google ratings. Their local manufacturing presence provides added confidence in product quality and warranty fulfillment. For homeowners seeking Canadian-made windows with proven performance in Ontario’s climate conditions, Centennial represents a solid middle-ground between budget options and premium-priced competitors.
4. Landmark Windows & Doors
Key Features
Landmark has carved out a niche as a value-focused provider that makes quality window replacement accessible to budget-conscious homeowners. As an independent company with over 15 years serving the London area, they offer a streamlined approach that reduces overhead costs while maintaining essential quality standards. Their business model focuses on efficient operations, minimal showroom expenses, and direct supplier relationships that allow them to offer competitive pricing without sacrificing important features.
Their consultation process emphasizes education, helping homeowners understand the critical elements that affect window performance while identifying areas where costs can be reduced without compromising quality. Their installation teams are trained to complete projects efficiently, often finishing full home window replacements in just 1-2 days with minimal disruption to the household.
Product Range
- Energy-efficient vinyl windows
- Double glazed windows
- Single hung and double hung windows
- Slider windows
- Fixed picture windows
- Basic casement options
- Entry doors and storm doors
- Vinyl patio doors
- Basement windows
- Egress windows for code compliance
Pros
Cons
Price Level
$-$$ (Economy to Mid-Range)
Conclusion
Landmark delivers remarkable value for cost-conscious homeowners, achieving impressive 4.7/5 Homestars and 4.6/5 Google ratings despite their budget-friendly positioning. Their focused approach makes quality window replacement accessible to a broader range of homeowners, including first-time buyers and those completing renovations with tight budgets. For projects where value and fundamental performance are the primary concerns, they offer satisfying results without the premium price.
5. Golden Windows: Custom Solutions Specialist
Key Features
Golden Windows distinguishes itself through specialized expertise in custom window solutions for both modern homes and heritage properties. With their manufacturing facility and showroom in the region, they offer unique capabilities for creating windows that meet specific architectural requirements, including options suitable for listed buildings with historical significance.
Their engineering team can create custom solutions for challenging openings, unusual shapes, or special performance requirements. They excel at balancing modern energy efficiency with traditional aesthetics, making them a preferred choice for period home renovations. Their design consultation includes 3D modeling to help homeowners visualize the final appearance before manufacturing begins.
Product Range
- Architectural specialty windows
- Custom shapes and sizes
- Heritage-compatible designs
- Aluminum frames options
- Wood-clad windows
- Fiberglass reinforced options
- Bay and bow configurations
- Garden doors
- French doors
- Lift and slide patio doors
- Commercial and residential options
Pros
Cons
Price Level
$$-$$$ (Mid to Upper-Mid Range)
Conclusion
Golden Windows earns their solid 4.6/5 Homestars and 4.5/5 Google ratings by excelling in specialized applications where standard products fall short. Their custom capabilities justify their higher price point for projects requiring unique solutions or heritage-compatible designs. While not the most economical choice for standard replacements, they provide exceptional value for homeowners with specific architectural requirements or design visions that mass-market products cannot fulfill.
Factors to Consider When Choosing a Window Company
1. Energy Efficiency Ratings
Look for ENERGY STAR certification and ask about U-factor and Solar Heat Gain Coefficient (SHGC) ratings. Lower U-factor numbers indicate better insulation properties, while SHGC measures how much solar radiation passes through the window. Windows with argon gas fill and Low-E coatings offer superior thermal performance.
2. Window Materials
Different frame materials offer various benefits:
- UPVC frames: Low maintenance, excellent insulation, cost-effective
- Aluminum frames: Slim profiles, modern appearance, strength and durability
- Wood: Traditional aesthetic, good insulation, higher maintenance requirements
- Fiberglass: Exceptional durability, minimal expansion/contraction, premium pricing
3. Glass Options
Consider double pane vs. triple pane configurations based on your climate needs and budget. Triple pane windows offer superior thermal efficiency and noise reduction but at a higher cost.
4. Installation Expertise
The quality of installation is as important as the windows themselves. Ask about:
- Whether installers are employees or subcontractors
- Installation certifications and training
- Typical project timelines
- How they handle unexpected challenges like rot or structural issues
5. Warranty Coverage
Examine warranty details carefully:
- Frame coverage duration and conditions
- Glass unit warranty (seal failure protection)
- Hardware warranty terms
- Labor/installation warranty
- Transferability to new owners
- Claim process and response time commitments
Things to Avoid When Selecting a Window Company
1. Pressure Sales Tactics
Be wary of companies that use high-pressure techniques or “today only” pricing offers. Reputable companies allow time for decision-making without aggressive tactics.
2. Unusually Low Estimates
Extremely low quotes often lead to added charges later or indicate poor quality materials and installation. Compare comprehensive quotes that specify all included components and services.
3. Lack of Proper Licensing and Insurance
Verify that any company you consider holds proper licensing for your region and carries adequate liability insurance and workers’ compensation coverage.
4. Vague Contract Terms
Avoid companies using contracts with unclear language about timelines, materials specifications, payment terms, or warranty conditions.
5. Poor Communication
Companies that are difficult to reach before the sale will likely be even harder to contact if warranty service is needed later.
Frequently Asked Questions
How do I identify the best window company in London for my project?
Look for companies with strong customer feedback, industry certifications, transparent pricing, and comprehensive warranties. Total Home Windows and Doors exemplifies these qualities with their engineering expertise and excellent energy efficiency ratings.
What's the difference between standard double glazing and premium double glazing products?
Premium double glazing features superior spacers, higher-quality seals, better gas fills, and enhanced frame insulation. The best double glazing companies use advanced manufacturing techniques to ensure longer-lasting performance and improved thermal efficiency.
Do all double glazing companies offer the same warranty terms?
No. While most double glazing companies provide basic coverage, top providers like Total Home offer comprehensive lifetime warranties on UPVC windows and frames, demonstrating confidence in their products and installation standards.
Are bay windows more expensive than standard windows?
Yes, bay windows typically cost more due to their complex structure and fitting requirements. However, they add significant character, create additional space, and allow more light into your home, making them worth the investment.
Can aluminium frames provide good thermal performance?
Modern aluminium frames incorporate thermal breaks and advanced design features to overcome traditional conductivity issues. When properly engineered, they deliver excellent energy efficiency while offering sleek aesthetics and exceptional durability.
How long does a typical window installation take?
Professional fitting windows typically takes 1-3 days for a full home, depending on the number of windows and complexity. The best companies minimize disruption through careful planning and high standard installation techniques.
Should I choose UPVC windows or explore other materials?
UPVC windows offer an excellent balance of affordability, thermal performance, and low maintenance. However, depending on your property style and preferences, aluminium or composite options might better suit specific architectural requirements.
What should I expect during a free quote appointment?
During a free quote assessment, expect measurements, discussion of your requirements, presentation of suitable options from their full range, and advice on energy-efficient solutions. No reputable company should pressure you during this consultation.
Do window companies also handle garage doors and conservatories?
Many companies like Total Home supply a complete home improvement solution including windows, doors, garage doors, and conservatories. This integrated approach ensures consistent quality and aesthetic harmony across your property.
What's an example of exceptional service from a window company?
An exemplary window company provides thorough consultation, precise measurements, clean and efficient installation, comprehensive aftercare, and responsive warranty service. First home improvements should always include ongoing support after project completion.
Conclusion
The London market offers excellent window replacement options across various price points and specializations. Total Home Windows and Doors stands out for their engineering innovation and exceptional customer service, making them our top recommendation for most homeowners. However, each company on our list offers distinct advantages that might make them the perfect fit depending on your specific needs and budget.
When making your selection, prioritize energy efficiency, installation quality, and comprehensive warranty coverage over the lowest price. Quality windows properly installed will provide decades of performance, making the initial investment in better products and installation worthwhile through energy savings, reduced maintenance, and enhanced home comfort.
For the best results, schedule consultations with multiple companies, ask detailed questions about their products and installation methods, and carefully review all quotes and contract terms before making your decision. This careful approach will help ensure your new windows enhance both the appearance and performance of your home for years to come.
