Poor window installation can reduce energy efficiency by up to 50% and void warranties completely. Learn why professional installation is essential, what to expect from quality installers, and how to avoid the costly mistakes that plague DIY and amateur installations.
Window installation is where even the highest-quality windows can fail. A €1,000 premium window installed incorrectly performs worse than a €300 standard window installed properly. In Lithuania's challenging climate, where thermal performance and weather sealing are critical, professional installation isn't just recommended—it's essential for achieving rated performance, maintaining warranties, and ensuring long-term satisfaction. This comprehensive guide reveals the critical aspects of professional window installation and why cutting corners on installation is the most expensive mistake homeowners make.
Performance Impact of Installation Quality
Energy Efficiency Consequences
Warranty and Insurance Implications
Structural and Safety Considerations
Long-term Cost Analysis
Industry fact: 80% of window performance problems are installation-related, not product defects. Professional installation is the most important factor in window performance.
Pre-Installation Assessment
Site Survey and Measurement
Preparation Requirements
Installation Methodology
Step 1: Removal of Existing Windows
Step 2: Opening Preparation
Step 3: Window Installation
Step 4: Sealing and Weatherproofing
Step 5: Testing and Commissioning
Critical Installation Errors
Improper Sealing and Air Barriers
Incorrect Fastening and Support
Poor Drainage and Waterproofing
Inadequate Insulation
Measurement and Sizing Errors
Hardware and Operation Issues
Code Compliance Failures
DIY installation mistakes often aren't discovered until years later when damage becomes visible. By then, repair costs can exceed the original window investment.
Industry Standards and Compliance
European Installation Standards
Lithuanian Building Codes
Professional Certifications
Installer Qualifications
Quality Assurance Programs
Testing and Verification Methods
Performance Testing
Documentation Requirements
Installer Selection Criteria
Essential Qualifications
Quality Indicators
Red Flags to Avoid
Evaluation Process
Initial Consultation
Reference Verification
Contract and Warranty Review
Project Management
Typical Installation Timeline
Pre-Installation Phase (1-2 weeks)
Installation Day Preparation
Installation Process (Per Window)
Post-Installation Activities
Weather Considerations
Homeowner Preparation
Before Installation
During Installation
After Installation
Professional tip: Quality installation cannot be rushed. Be wary of installers who promise unrealistic timelines or seem to rush through the process.
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Real feedback from our satisfied customers
"Incredibly professional and fast service. The technician fixed our window in under an hour. Highly recommended!"
"Great communication and transparent pricing. The quality of work was excellent. Very happy with the result."
"The team was punctual, polite, and very knowledgeable. They explained the issue clearly and fixed it efficiently."
"Fantastic service from start to finish. I will definitely use them again for any future window or door repairs."
The advantages of working with our team of professionals
No-cost initial assessment to identify the problem.
We provide up to a 5-year warranty.
Our technicians arrive promptly to address your needs quickly.
99% of repairs can be completed during the first visit.
We respect your home and always leave our workspace clean.
We work with all types of window and door profiles and manufacturers.
Pay by card, cash, or we can issue an invoice.
Our goal is your complete satisfaction with our work.
Everything you need to know about our window and door repair services
Yes, the initial inspection and our technician's visit to assess the work are completely free. No hidden fees and no obligations. If you decide to go ahead, the technician will prepare a clear quote on the spot, explain everything to you and, if you agree, can usually do the work right away during the same visit.
Of course. We provide a warranty both for the work carried out and for the materials used, in line with the laws of the Republic of Lithuania.
The price depends on the type of window, the issue, and the materials needed. When the technician arrives, they give you an exact quote on site with no hidden charges, and you decide yourself whether you want to proceed with the repair.
Yes, our window service operates all over Lithuania: in Vilnius, Kaunas, Klaipėda, Panevėžys, Šiauliai and other cities and towns.
Booking a free visit is very simple. Just give us a call or fill in the online booking form – in both cases it only takes a few minutes.
In most cases repair is enough: replacing seals or mechanisms, improving insulation, adjusting the fittings, cleaning and lubricating the hardware. This is usually much cheaper than installing brand new windows.
Repair is cheaper, because you don't have to buy new windows, remove the old ones, dispose of them or redo the interior finishes afterwards. Repair saves both time and money and is significantly more cost‑effective.
We work with all major brands: Rehau, Veka, KBE, Schüco, Salamander, Aluplast and many others. Our technicians are trained to work with the specific mechanisms used by each manufacturer.
Yes, you can pay by all major bank cards, by bank transfer or in cash. Payment is made after the work is completed.
Yes, we provide services all year round. In winter we use specific methods so that the room doesn't get cold during the work and your comfort is kept to a maximum.